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update sqlalchemy

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Jan Gerber 2016-02-22 13:17:39 +01:00
parent 6c6c3e68c6
commit a4267212e4
192 changed files with 17429 additions and 9601 deletions
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367
lib/python3.5/site-packages/SQLAlchemy-0.9.7.dist-info/RECORD
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0
lib/python3.5/site-packages/SQLAlchemy-0.9.7.dist-info/DESCRIPTION.rst → lib/python3.5/site-packages/SQLAlchemy-1.0.12.dist-info/DESCRIPTION.rst
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2
lib/python3.5/site-packages/SQLAlchemy-0.9.7.dist-info/METADATA → lib/python3.5/site-packages/SQLAlchemy-1.0.12.dist-info/METADATA
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@ -1,6 +1,6 @@
Metadata-Version: 2.0
Name: SQLAlchemy
Version: 0.9.7
Version: 1.0.12
Summary: Database Abstraction Library
Home-page: http://www.sqlalchemy.org
Author: Mike Bayer

375
lib/python3.5/site-packages/SQLAlchemy-1.0.12.dist-info/RECORD Normal file
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@ -0,0 +1,375 @@
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0
lib/python3.5/site-packages/SQLAlchemy-0.9.7.dist-info/WHEEL → lib/python3.5/site-packages/SQLAlchemy-1.0.12.dist-info/WHEEL
View file

2
lib/python3.5/site-packages/SQLAlchemy-0.9.7.dist-info/metadata.json → lib/python3.5/site-packages/SQLAlchemy-1.0.12.dist-info/metadata.json
View file

@ -1 +1 @@
{"generator": "bdist_wheel (0.26.0)", "summary": "Database Abstraction Library", "classifiers": ["Development Status :: 5 - Production/Stable", "Intended Audience :: Developers", "License :: OSI Approved :: MIT License", "Programming Language :: Python", "Programming Language :: Python :: 3", "Programming Language :: Python :: Implementation :: CPython", "Programming Language :: Python :: Implementation :: Jython", "Programming Language :: Python :: Implementation :: PyPy", "Topic :: Database :: Front-Ends", "Operating System :: OS Independent"], "extensions": {"python.details": {"project_urls": {"Home": "http://www.sqlalchemy.org"}, "contacts": [{"email": "mike_mp@zzzcomputing.com", "name": "Mike Bayer", "role": "author"}], "document_names": {"description": "DESCRIPTION.rst"}}}, "license": "MIT License", "metadata_version": "2.0", "name": "SQLAlchemy", "version": "0.9.7", "test_requires": [{"requires": ["mock", "pytest (>=2.5.2)"]}]}
{"generator": "bdist_wheel (0.26.0)", "summary": "Database Abstraction Library", "classifiers": ["Development Status :: 5 - Production/Stable", "Intended Audience :: Developers", "License :: OSI Approved :: MIT License", "Programming Language :: Python", "Programming Language :: Python :: 3", "Programming Language :: Python :: Implementation :: CPython", "Programming Language :: Python :: Implementation :: Jython", "Programming Language :: Python :: Implementation :: PyPy", "Topic :: Database :: Front-Ends", "Operating System :: OS Independent"], "extensions": {"python.details": {"project_urls": {"Home": "http://www.sqlalchemy.org"}, "contacts": [{"email": "mike_mp@zzzcomputing.com", "name": "Mike Bayer", "role": "author"}], "document_names": {"description": "DESCRIPTION.rst"}}}, "license": "MIT License", "metadata_version": "2.0", "name": "SQLAlchemy", "version": "1.0.12", "test_requires": [{"requires": ["mock", "pytest (>=2.5.2)", "pytest-xdist"]}]}

0
lib/python3.5/site-packages/SQLAlchemy-0.9.7.dist-info/top_level.txt → lib/python3.5/site-packages/SQLAlchemy-1.0.12.dist-info/top_level.txt
View file

7
lib/python3.5/site-packages/sqlalchemy/__init__.py
View file

@ -1,5 +1,5 @@
# sqlalchemy/__init__.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -15,6 +15,7 @@ from .sql import (
case,
cast,
collate,
column,
delete,
desc,
distinct,
@ -24,6 +25,7 @@ from .sql import (
extract,
false,
func,
funcfilter,
insert,
intersect,
intersect_all,
@ -39,6 +41,7 @@ from .sql import (
over,
select,
subquery,
table,
text,
true,
tuple_,
@ -117,7 +120,7 @@ from .schema import (
from .inspection import inspect
from .engine import create_engine, engine_from_config
__version__ = '0.9.7'
__version__ = '1.0.12'
def __go(lcls):

2
lib/python3.5/site-packages/sqlalchemy/connectors/__init__.py
View file

@ -1,5 +1,5 @@
# connectors/__init__.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under

2
lib/python3.5/site-packages/sqlalchemy/connectors/mxodbc.py
View file

@ -1,5 +1,5 @@
# connectors/mxodbc.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under

145
lib/python3.5/site-packages/sqlalchemy/connectors/mysqldb.py
View file

@ -1,145 +0,0 @@
# connectors/mysqldb.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
"""Define behaviors common to MySQLdb dialects.
Currently includes MySQL and Drizzle.
"""
from . import Connector
from ..engine import base as engine_base, default
from ..sql import operators as sql_operators
from .. import exc, log, schema, sql, types as sqltypes, util, processors
import re
# the subclassing of Connector by all classes
# here is not strictly necessary
class MySQLDBExecutionContext(Connector):
@property
def rowcount(self):
if hasattr(self, '_rowcount'):
return self._rowcount
else:
return self.cursor.rowcount
class MySQLDBCompiler(Connector):
def visit_mod_binary(self, binary, operator, **kw):
return self.process(binary.left, **kw) + " %% " + \
self.process(binary.right, **kw)
def post_process_text(self, text):
return text.replace('%', '%%')
class MySQLDBIdentifierPreparer(Connector):
def _escape_identifier(self, value):
value = value.replace(self.escape_quote, self.escape_to_quote)
return value.replace("%", "%%")
class MySQLDBConnector(Connector):
driver = 'mysqldb'
supports_unicode_statements = False
supports_sane_rowcount = True
supports_sane_multi_rowcount = True
supports_native_decimal = True
default_paramstyle = 'format'
@classmethod
def dbapi(cls):
# is overridden when pymysql is used
return __import__('MySQLdb')
def do_executemany(self, cursor, statement, parameters, context=None):
rowcount = cursor.executemany(statement, parameters)
if context is not None:
context._rowcount = rowcount
def create_connect_args(self, url):
opts = url.translate_connect_args(database='db', username='user',
password='passwd')
opts.update(url.query)
util.coerce_kw_type(opts, 'compress', bool)
util.coerce_kw_type(opts, 'connect_timeout', int)
util.coerce_kw_type(opts, 'read_timeout', int)
util.coerce_kw_type(opts, 'client_flag', int)
util.coerce_kw_type(opts, 'local_infile', int)
# Note: using either of the below will cause all strings to be returned
# as Unicode, both in raw SQL operations and with column types like
# String and MSString.
util.coerce_kw_type(opts, 'use_unicode', bool)
util.coerce_kw_type(opts, 'charset', str)
# Rich values 'cursorclass' and 'conv' are not supported via
# query string.
ssl = {}
keys = ['ssl_ca', 'ssl_key', 'ssl_cert', 'ssl_capath', 'ssl_cipher']
for key in keys:
if key in opts:
ssl[key[4:]] = opts[key]
util.coerce_kw_type(ssl, key[4:], str)
del opts[key]
if ssl:
opts['ssl'] = ssl
# FOUND_ROWS must be set in CLIENT_FLAGS to enable
# supports_sane_rowcount.
client_flag = opts.get('client_flag', 0)
if self.dbapi is not None:
try:
CLIENT_FLAGS = __import__(
self.dbapi.__name__ + '.constants.CLIENT'
).constants.CLIENT
client_flag |= CLIENT_FLAGS.FOUND_ROWS
except (AttributeError, ImportError):
self.supports_sane_rowcount = False
opts['client_flag'] = client_flag
return [[], opts]
def _get_server_version_info(self, connection):
dbapi_con = connection.connection
version = []
r = re.compile('[.\-]')
for n in r.split(dbapi_con.get_server_info()):
try:
version.append(int(n))
except ValueError:
version.append(n)
return tuple(version)
def _extract_error_code(self, exception):
return exception.args[0]
def _detect_charset(self, connection):
"""Sniff out the character set in use for connection results."""
try:
# note: the SQL here would be
# "SHOW VARIABLES LIKE 'character_set%%'"
cset_name = connection.connection.character_set_name
except AttributeError:
util.warn(
"No 'character_set_name' can be detected with "
"this MySQL-Python version; "
"please upgrade to a recent version of MySQL-Python. "
"Assuming latin1.")
return 'latin1'
else:
return cset_name()

23
lib/python3.5/site-packages/sqlalchemy/connectors/pyodbc.py
View file

@ -1,5 +1,5 @@
# connectors/pyodbc.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -26,7 +26,7 @@ class PyODBCConnector(Connector):
supports_native_decimal = True
default_paramstyle = 'named'
# for non-DSN connections, this should
# for non-DSN connections, this *may* be used to
# hold the desired driver name
pyodbc_driver_name = None
@ -75,10 +75,21 @@ class PyODBCConnector(Connector):
if 'port' in keys and 'port' not in query:
port = ',%d' % int(keys.pop('port'))
connectors = ["DRIVER={%s}" %
keys.pop('driver', self.pyodbc_driver_name),
'Server=%s%s' % (keys.pop('host', ''), port),
'Database=%s' % keys.pop('database', '')]
connectors = []
driver = keys.pop('driver', self.pyodbc_driver_name)
if driver is None:
util.warn(
"No driver name specified; "
"this is expected by PyODBC when using "
"DSN-less connections")
else:
connectors.append("DRIVER={%s}" % driver)
connectors.extend(
[
'Server=%s%s' % (keys.pop('host', ''), port),
'Database=%s' % keys.pop('database', '')
])
user = keys.pop("user", None)
if user:

2
lib/python3.5/site-packages/sqlalchemy/connectors/zxJDBC.py
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@ -1,5 +1,5 @@
# connectors/zxJDBC.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under

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lib/python3.5/site-packages/sqlalchemy/databases/__init__.py
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@ -1,5 +1,5 @@
# databases/__init__.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -13,7 +13,6 @@ from ..dialects.sqlite import base as sqlite
from ..dialects.postgresql import base as postgresql
postgres = postgresql
from ..dialects.mysql import base as mysql
from ..dialects.drizzle import base as drizzle
from ..dialects.oracle import base as oracle
from ..dialects.firebird import base as firebird
from ..dialects.mssql import base as mssql
@ -21,7 +20,6 @@ from ..dialects.sybase import base as sybase
__all__ = (
'drizzle',
'firebird',
'mssql',
'mysql',

3
lib/python3.5/site-packages/sqlalchemy/dialects/__init__.py
View file

@ -1,12 +1,11 @@
# dialects/__init__.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
__all__ = (
'drizzle',
'firebird',
'mssql',
'mysql',

22
lib/python3.5/site-packages/sqlalchemy/dialects/drizzle/__init__.py
View file

@ -1,22 +0,0 @@
from sqlalchemy.dialects.drizzle import base, mysqldb
base.dialect = mysqldb.dialect
from sqlalchemy.dialects.drizzle.base import \
BIGINT, BINARY, BLOB, \
BOOLEAN, CHAR, DATE, \
DATETIME, DECIMAL, DOUBLE, \
ENUM, FLOAT, INTEGER, \
NUMERIC, REAL, TEXT, \
TIME, TIMESTAMP, VARBINARY, \
VARCHAR, dialect
__all__ = (
'BIGINT', 'BINARY', 'BLOB',
'BOOLEAN', 'CHAR', 'DATE',
'DATETIME', 'DECIMAL', 'DOUBLE',
'ENUM', 'FLOAT', 'INTEGER',
'NUMERIC', 'REAL', 'TEXT',
'TIME', 'TIMESTAMP', 'VARBINARY',
'VARCHAR', 'dialect'
)

499
lib/python3.5/site-packages/sqlalchemy/dialects/drizzle/base.py
View file

@ -1,499 +0,0 @@
# drizzle/base.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# <see AUTHORS file>
# Copyright (C) 2010-2011 Monty Taylor <mordred@inaugust.com>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
"""
.. dialect:: drizzle
:name: Drizzle
Drizzle is a variant of MySQL. Unlike MySQL, Drizzle's default storage engine
is InnoDB (transactions, foreign-keys) rather than MyISAM. For more
`Notable Differences <http://docs.drizzle.org/mysql_differences.html>`_, visit
the `Drizzle Documentation <http://docs.drizzle.org/index.html>`_.
The SQLAlchemy Drizzle dialect leans heavily on the MySQL dialect, so much of
the :doc:`SQLAlchemy MySQL <mysql>` documentation is also relevant.
"""
from sqlalchemy import exc
from sqlalchemy import log
from sqlalchemy import types as sqltypes
from sqlalchemy.engine import reflection
from sqlalchemy.dialects.mysql import base as mysql_dialect
from sqlalchemy.types import DATE, DATETIME, BOOLEAN, TIME, \
BLOB, BINARY, VARBINARY
class _NumericType(object):
"""Base for Drizzle numeric types."""
def __init__(self, **kw):
super(_NumericType, self).__init__(**kw)
class _FloatType(_NumericType, sqltypes.Float):
def __init__(self, precision=None, scale=None, asdecimal=True, **kw):
if isinstance(self, (REAL, DOUBLE)) and \
(
(precision is None and scale is not None) or
(precision is not None and scale is None)
):
raise exc.ArgumentError(
"You must specify both precision and scale or omit "
"both altogether.")
super(_FloatType, self).__init__(precision=precision,
asdecimal=asdecimal, **kw)
self.scale = scale
class _StringType(mysql_dialect._StringType):
"""Base for Drizzle string types."""
def __init__(self, collation=None, binary=False, **kw):
kw['national'] = False
super(_StringType, self).__init__(collation=collation, binary=binary,
**kw)
class NUMERIC(_NumericType, sqltypes.NUMERIC):
"""Drizzle NUMERIC type."""
__visit_name__ = 'NUMERIC'
def __init__(self, precision=None, scale=None, asdecimal=True, **kw):
"""Construct a NUMERIC.
:param precision: Total digits in this number. If scale and precision
are both None, values are stored to limits allowed by the server.
:param scale: The number of digits after the decimal point.
"""
super(NUMERIC, self).__init__(precision=precision, scale=scale,
asdecimal=asdecimal, **kw)
class DECIMAL(_NumericType, sqltypes.DECIMAL):
"""Drizzle DECIMAL type."""
__visit_name__ = 'DECIMAL'
def __init__(self, precision=None, scale=None, asdecimal=True, **kw):
"""Construct a DECIMAL.
:param precision: Total digits in this number. If scale and precision
are both None, values are stored to limits allowed by the server.
:param scale: The number of digits after the decimal point.
"""
super(DECIMAL, self).__init__(precision=precision, scale=scale,
asdecimal=asdecimal, **kw)
class DOUBLE(_FloatType):
"""Drizzle DOUBLE type."""
__visit_name__ = 'DOUBLE'
def __init__(self, precision=None, scale=None, asdecimal=True, **kw):
"""Construct a DOUBLE.
:param precision: Total digits in this number. If scale and precision
are both None, values are stored to limits allowed by the server.
:param scale: The number of digits after the decimal point.
"""
super(DOUBLE, self).__init__(precision=precision, scale=scale,
asdecimal=asdecimal, **kw)
class REAL(_FloatType, sqltypes.REAL):
"""Drizzle REAL type."""
__visit_name__ = 'REAL'
def __init__(self, precision=None, scale=None, asdecimal=True, **kw):
"""Construct a REAL.
:param precision: Total digits in this number. If scale and precision
are both None, values are stored to limits allowed by the server.
:param scale: The number of digits after the decimal point.
"""
super(REAL, self).__init__(precision=precision, scale=scale,
asdecimal=asdecimal, **kw)
class FLOAT(_FloatType, sqltypes.FLOAT):
"""Drizzle FLOAT type."""
__visit_name__ = 'FLOAT'
def __init__(self, precision=None, scale=None, asdecimal=False, **kw):
"""Construct a FLOAT.
:param precision: Total digits in this number. If scale and precision
are both None, values are stored to limits allowed by the server.
:param scale: The number of digits after the decimal point.
"""
super(FLOAT, self).__init__(precision=precision, scale=scale,
asdecimal=asdecimal, **kw)
def bind_processor(self, dialect):
return None
class INTEGER(sqltypes.INTEGER):
"""Drizzle INTEGER type."""
__visit_name__ = 'INTEGER'
def __init__(self, **kw):
"""Construct an INTEGER."""
super(INTEGER, self).__init__(**kw)
class BIGINT(sqltypes.BIGINT):
"""Drizzle BIGINTEGER type."""
__visit_name__ = 'BIGINT'
def __init__(self, **kw):
"""Construct a BIGINTEGER."""
super(BIGINT, self).__init__(**kw)
class TIME(mysql_dialect.TIME):
"""Drizzle TIME type."""
class TIMESTAMP(sqltypes.TIMESTAMP):
"""Drizzle TIMESTAMP type."""
__visit_name__ = 'TIMESTAMP'
class TEXT(_StringType, sqltypes.TEXT):
"""Drizzle TEXT type, for text up to 2^16 characters."""
__visit_name__ = 'TEXT'
def __init__(self, length=None, **kw):
"""Construct a TEXT.
:param length: Optional, if provided the server may optimize storage
by substituting the smallest TEXT type sufficient to store
``length`` characters.
:param collation: Optional, a column-level collation for this string
value. Takes precedence to 'binary' short-hand.
:param binary: Defaults to False: short-hand, pick the binary
collation type that matches the column's character set. Generates
BINARY in schema. This does not affect the type of data stored,
only the collation of character data.
"""
super(TEXT, self).__init__(length=length, **kw)
class VARCHAR(_StringType, sqltypes.VARCHAR):
"""Drizzle VARCHAR type, for variable-length character data."""
__visit_name__ = 'VARCHAR'
def __init__(self, length=None, **kwargs):
"""Construct a VARCHAR.
:param collation: Optional, a column-level collation for this string
value. Takes precedence to 'binary' short-hand.
:param binary: Defaults to False: short-hand, pick the binary
collation type that matches the column's character set. Generates
BINARY in schema. This does not affect the type of data stored,
only the collation of character data.
"""
super(VARCHAR, self).__init__(length=length, **kwargs)
class CHAR(_StringType, sqltypes.CHAR):
"""Drizzle CHAR type, for fixed-length character data."""
__visit_name__ = 'CHAR'
def __init__(self, length=None, **kwargs):
"""Construct a CHAR.
:param length: Maximum data length, in characters.
:param binary: Optional, use the default binary collation for the
national character set. This does not affect the type of data
stored, use a BINARY type for binary data.
:param collation: Optional, request a particular collation. Must be
compatible with the national character set.
"""
super(CHAR, self).__init__(length=length, **kwargs)
class ENUM(mysql_dialect.ENUM):
"""Drizzle ENUM type."""
def __init__(self, *enums, **kw):
"""Construct an ENUM.
Example:
Column('myenum', ENUM("foo", "bar", "baz"))
:param enums: The range of valid values for this ENUM. Values will be
quoted when generating the schema according to the quoting flag (see
below).
:param strict: Defaults to False: ensure that a given value is in this
ENUM's range of permissible values when inserting or updating rows.
Note that Drizzle will not raise a fatal error if you attempt to
store an out of range value- an alternate value will be stored
instead.
(See Drizzle ENUM documentation.)
:param collation: Optional, a column-level collation for this string
value. Takes precedence to 'binary' short-hand.
:param binary: Defaults to False: short-hand, pick the binary
collation type that matches the column's character set. Generates
BINARY in schema. This does not affect the type of data stored,
only the collation of character data.
:param quoting: Defaults to 'auto': automatically determine enum value
quoting. If all enum values are surrounded by the same quoting
character, then use 'quoted' mode. Otherwise, use 'unquoted' mode.
'quoted': values in enums are already quoted, they will be used
directly when generating the schema - this usage is deprecated.
'unquoted': values in enums are not quoted, they will be escaped and
surrounded by single quotes when generating the schema.
Previous versions of this type always required manually quoted
values to be supplied; future versions will always quote the string
literals for you. This is a transitional option.
"""
super(ENUM, self).__init__(*enums, **kw)
class _DrizzleBoolean(sqltypes.Boolean):
def get_dbapi_type(self, dbapi):
return dbapi.NUMERIC
colspecs = {
sqltypes.Numeric: NUMERIC,
sqltypes.Float: FLOAT,
sqltypes.Time: TIME,
sqltypes.Enum: ENUM,
sqltypes.Boolean: _DrizzleBoolean,
}
# All the types we have in Drizzle
ischema_names = {
'BIGINT': BIGINT,
'BINARY': BINARY,
'BLOB': BLOB,
'BOOLEAN': BOOLEAN,
'CHAR': CHAR,
'DATE': DATE,
'DATETIME': DATETIME,
'DECIMAL': DECIMAL,
'DOUBLE': DOUBLE,
'ENUM': ENUM,
'FLOAT': FLOAT,
'INT': INTEGER,
'INTEGER': INTEGER,
'NUMERIC': NUMERIC,
'TEXT': TEXT,
'TIME': TIME,
'TIMESTAMP': TIMESTAMP,
'VARBINARY': VARBINARY,
'VARCHAR': VARCHAR,
}
class DrizzleCompiler(mysql_dialect.MySQLCompiler):
def visit_typeclause(self, typeclause):
type_ = typeclause.type.dialect_impl(self.dialect)
if isinstance(type_, sqltypes.Integer):
return 'INTEGER'
else:
return super(DrizzleCompiler, self).visit_typeclause(typeclause)
def visit_cast(self, cast, **kwargs):
type_ = self.process(cast.typeclause)
if type_ is None:
return self.process(cast.clause)
return 'CAST(%s AS %s)' % (self.process(cast.clause), type_)
class DrizzleDDLCompiler(mysql_dialect.MySQLDDLCompiler):
pass
class DrizzleTypeCompiler(mysql_dialect.MySQLTypeCompiler):
def _extend_numeric(self, type_, spec):
return spec
def _extend_string(self, type_, defaults, spec):
"""Extend a string-type declaration with standard SQL
COLLATE annotations and Drizzle specific extensions.
"""
def attr(name):
return getattr(type_, name, defaults.get(name))
if attr('collation'):
collation = 'COLLATE %s' % type_.collation
elif attr('binary'):
collation = 'BINARY'
else:
collation = None
return ' '.join([c for c in (spec, collation)
if c is not None])
def visit_NCHAR(self, type):
raise NotImplementedError("Drizzle does not support NCHAR")
def visit_NVARCHAR(self, type):
raise NotImplementedError("Drizzle does not support NVARCHAR")
def visit_FLOAT(self, type_):
if type_.scale is not None and type_.precision is not None:
return "FLOAT(%s, %s)" % (type_.precision, type_.scale)
else:
return "FLOAT"
def visit_BOOLEAN(self, type_):
return "BOOLEAN"
def visit_BLOB(self, type_):
return "BLOB"
class DrizzleExecutionContext(mysql_dialect.MySQLExecutionContext):
pass
class DrizzleIdentifierPreparer(mysql_dialect.MySQLIdentifierPreparer):
pass
@log.class_logger
class DrizzleDialect(mysql_dialect.MySQLDialect):
"""Details of the Drizzle dialect.
Not used directly in application code.
"""
name = 'drizzle'
_supports_cast = True
supports_sequences = False
supports_native_boolean = True
supports_views = False
default_paramstyle = 'format'
colspecs = colspecs
statement_compiler = DrizzleCompiler
ddl_compiler = DrizzleDDLCompiler
type_compiler = DrizzleTypeCompiler
ischema_names = ischema_names
preparer = DrizzleIdentifierPreparer
def on_connect(self):
"""Force autocommit - Drizzle Bug#707842 doesn't set this properly"""
def connect(conn):
conn.autocommit(False)
return connect
@reflection.cache
def get_table_names(self, connection, schema=None, **kw):
"""Return a Unicode SHOW TABLES from a given schema."""
if schema is not None:
current_schema = schema
else:
current_schema = self.default_schema_name
charset = 'utf8'
rp = connection.execute("SHOW TABLES FROM %s" %
self.identifier_preparer.quote_identifier(current_schema))
return [row[0] for row in self._compat_fetchall(rp, charset=charset)]
@reflection.cache
def get_view_names(self, connection, schema=None, **kw):
raise NotImplementedError
def _detect_casing(self, connection):
"""Sniff out identifier case sensitivity.
Cached per-connection. This value can not change without a server
restart.
"""
return 0
def _detect_collations(self, connection):
"""Pull the active COLLATIONS list from the server.
Cached per-connection.
"""
collations = {}
charset = self._connection_charset
rs = connection.execute(
'SELECT CHARACTER_SET_NAME, COLLATION_NAME FROM'
' data_dictionary.COLLATIONS')
for row in self._compat_fetchall(rs, charset):
collations[row[0]] = row[1]
return collations
def _detect_ansiquotes(self, connection):
"""Detect and adjust for the ANSI_QUOTES sql mode."""
self._server_ansiquotes = False
self._backslash_escapes = False

48
lib/python3.5/site-packages/sqlalchemy/dialects/drizzle/mysqldb.py
View file

@ -1,48 +0,0 @@
"""
.. dialect:: drizzle+mysqldb
:name: MySQL-Python
:dbapi: mysqldb
:connectstring: drizzle+mysqldb://<user>:<password>@<host>[:<port>]/<dbname>
:url: http://sourceforge.net/projects/mysql-python
"""
from sqlalchemy.dialects.drizzle.base import (
DrizzleDialect,
DrizzleExecutionContext,
DrizzleCompiler,
DrizzleIdentifierPreparer)
from sqlalchemy.connectors.mysqldb import (
MySQLDBExecutionContext,
MySQLDBCompiler,
MySQLDBIdentifierPreparer,
MySQLDBConnector)
class DrizzleExecutionContext_mysqldb(MySQLDBExecutionContext,
DrizzleExecutionContext):
pass
class DrizzleCompiler_mysqldb(MySQLDBCompiler, DrizzleCompiler):
pass
class DrizzleIdentifierPreparer_mysqldb(MySQLDBIdentifierPreparer,
DrizzleIdentifierPreparer):
pass
class DrizzleDialect_mysqldb(MySQLDBConnector, DrizzleDialect):
execution_ctx_cls = DrizzleExecutionContext_mysqldb
statement_compiler = DrizzleCompiler_mysqldb
preparer = DrizzleIdentifierPreparer_mysqldb
def _detect_charset(self, connection):
"""Sniff out the character set in use for connection results."""
return 'utf8'
dialect = DrizzleDialect_mysqldb

2
lib/python3.5/site-packages/sqlalchemy/dialects/firebird/__init__.py
View file

@ -1,5 +1,5 @@
# firebird/__init__.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under

35
lib/python3.5/site-packages/sqlalchemy/dialects/firebird/base.py
View file

@ -1,5 +1,5 @@
# firebird/base.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -78,7 +78,6 @@ from sqlalchemy.sql import expression
from sqlalchemy.engine import base, default, reflection
from sqlalchemy.sql import compiler
from sqlalchemy.types import (BIGINT, BLOB, DATE, FLOAT, INTEGER, NUMERIC,
SMALLINT, TEXT, TIME, TIMESTAMP, Integer)
@ -181,16 +180,16 @@ ischema_names = {
# _FBDate, etc. as bind/result functionality is required)
class FBTypeCompiler(compiler.GenericTypeCompiler):
def visit_boolean(self, type_):
return self.visit_SMALLINT(type_)
def visit_boolean(self, type_, **kw):
return self.visit_SMALLINT(type_, **kw)
def visit_datetime(self, type_):
return self.visit_TIMESTAMP(type_)
def visit_datetime(self, type_, **kw):
return self.visit_TIMESTAMP(type_, **kw)
def visit_TEXT(self, type_):
def visit_TEXT(self, type_, **kw):
return "BLOB SUB_TYPE 1"
def visit_BLOB(self, type_):
def visit_BLOB(self, type_, **kw):
return "BLOB SUB_TYPE 0"
def _extend_string(self, type_, basic):
@ -200,16 +199,16 @@ class FBTypeCompiler(compiler.GenericTypeCompiler):
else:
return '%s CHARACTER SET %s' % (basic, charset)
def visit_CHAR(self, type_):
basic = super(FBTypeCompiler, self).visit_CHAR(type_)
def visit_CHAR(self, type_, **kw):
basic = super(FBTypeCompiler, self).visit_CHAR(type_, **kw)
return self._extend_string(type_, basic)
def visit_VARCHAR(self, type_):
def visit_VARCHAR(self, type_, **kw):
if not type_.length:
raise exc.CompileError(
"VARCHAR requires a length on dialect %s" %
self.dialect.name)
basic = super(FBTypeCompiler, self).visit_VARCHAR(type_)
basic = super(FBTypeCompiler, self).visit_VARCHAR(type_, **kw)
return self._extend_string(type_, basic)
@ -294,22 +293,22 @@ class FBCompiler(sql.compiler.SQLCompiler):
def visit_sequence(self, seq):
return "gen_id(%s, 1)" % self.preparer.format_sequence(seq)
def get_select_precolumns(self, select):
def get_select_precolumns(self, select, **kw):
"""Called when building a ``SELECT`` statement, position is just
before column list Firebird puts the limit and offset right
after the ``SELECT``...
"""
result = ""
if select._limit:
result += "FIRST %s " % self.process(sql.literal(select._limit))
if select._offset:
result += "SKIP %s " % self.process(sql.literal(select._offset))
if select._limit_clause is not None:
result += "FIRST %s " % self.process(select._limit_clause, **kw)
if select._offset_clause is not None:
result += "SKIP %s " % self.process(select._offset_clause, **kw)
if select._distinct:
result += "DISTINCT "
return result
def limit_clause(self, select):
def limit_clause(self, select, **kw):
"""Already taken care of in the `get_select_precolumns` method."""
return ""

2
lib/python3.5/site-packages/sqlalchemy/dialects/firebird/fdb.py
View file

@ -1,5 +1,5 @@
# firebird/fdb.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under

2
lib/python3.5/site-packages/sqlalchemy/dialects/firebird/kinterbasdb.py
View file

@ -1,5 +1,5 @@
# firebird/kinterbasdb.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under

2
lib/python3.5/site-packages/sqlalchemy/dialects/mssql/__init__.py
View file

@ -1,5 +1,5 @@
# mssql/__init__.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under

2
lib/python3.5/site-packages/sqlalchemy/dialects/mssql/adodbapi.py
View file

@ -1,5 +1,5 @@
# mssql/adodbapi.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under

401
lib/python3.5/site-packages/sqlalchemy/dialects/mssql/base.py
View file

@ -1,5 +1,5 @@
# mssql/base.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -166,6 +166,55 @@ how SQLAlchemy handles this:
This
is an auxilliary use case suitable for testing and bulk insert scenarios.
.. _legacy_schema_rendering:
Rendering of SQL statements that include schema qualifiers
---------------------------------------------------------
When using :class:`.Table` metadata that includes a "schema" qualifier,
such as::
account_table = Table(
'account', metadata,
Column('id', Integer, primary_key=True),
Column('info', String(100)),
schema="customer_schema"
)
The SQL Server dialect has a long-standing behavior that it will attempt
to turn a schema-qualified table name into an alias, such as::
>>> eng = create_engine("mssql+pymssql://mydsn")
>>> print(account_table.select().compile(eng))
SELECT account_1.id, account_1.info
FROM customer_schema.account AS account_1
This behavior is legacy, does not function correctly for many forms
of SQL statements, and will be disabled by default in the 1.1 series
of SQLAlchemy. As of 1.0.5, the above statement will produce the following
warning::
SAWarning: legacy_schema_aliasing flag is defaulted to True;
some schema-qualified queries may not function correctly.
Consider setting this flag to False for modern SQL Server versions;
this flag will default to False in version 1.1
This warning encourages the :class:`.Engine` to be created as follows::
>>> eng = create_engine("mssql+pymssql://mydsn", legacy_schema_aliasing=False)
Where the above SELECT statement will produce::
>>> print(account_table.select().compile(eng))
SELECT customer_schema.account.id, customer_schema.account.info
FROM customer_schema.account
The warning will not emit if the ``legacy_schema_aliasing`` flag is set
to either True or False.
.. versionadded:: 1.0.5 - Added the ``legacy_schema_aliasing`` flag to disable
the SQL Server dialect's legacy behavior with schema-qualified table
names. This flag will default to False in version 1.1.
Collation Support
-----------------
@ -187,7 +236,7 @@ CREATE TABLE statement for this column will yield::
LIMIT/OFFSET Support
--------------------
MSSQL has no support for the LIMIT or OFFSET keysowrds. LIMIT is
MSSQL has no support for the LIMIT or OFFSET keywords. LIMIT is
supported directly through the ``TOP`` Transact SQL keyword::
select.limit
@ -226,6 +275,53 @@ The DATE and TIME types are not available for MSSQL 2005 and
previous - if a server version below 2008 is detected, DDL
for these types will be issued as DATETIME.
.. _mssql_large_type_deprecation:
Large Text/Binary Type Deprecation
----------------------------------
Per `SQL Server 2012/2014 Documentation <http://technet.microsoft.com/en-us/library/ms187993.aspx>`_,
the ``NTEXT``, ``TEXT`` and ``IMAGE`` datatypes are to be removed from SQL Server
in a future release. SQLAlchemy normally relates these types to the
:class:`.UnicodeText`, :class:`.Text` and :class:`.LargeBinary` datatypes.
In order to accommodate this change, a new flag ``deprecate_large_types``
is added to the dialect, which will be automatically set based on detection
of the server version in use, if not otherwise set by the user. The
behavior of this flag is as follows:
* When this flag is ``True``, the :class:`.UnicodeText`, :class:`.Text` and
:class:`.LargeBinary` datatypes, when used to render DDL, will render the
types ``NVARCHAR(max)``, ``VARCHAR(max)``, and ``VARBINARY(max)``,
respectively. This is a new behavior as of the addition of this flag.
* When this flag is ``False``, the :class:`.UnicodeText`, :class:`.Text` and
:class:`.LargeBinary` datatypes, when used to render DDL, will render the
types ``NTEXT``, ``TEXT``, and ``IMAGE``,
respectively. This is the long-standing behavior of these types.
* The flag begins with the value ``None``, before a database connection is
established. If the dialect is used to render DDL without the flag being
set, it is interpreted the same as ``False``.
* On first connection, the dialect detects if SQL Server version 2012 or greater
is in use; if the flag is still at ``None``, it sets it to ``True`` or
``False`` based on whether 2012 or greater is detected.
* The flag can be set to either ``True`` or ``False`` when the dialect
is created, typically via :func:`.create_engine`::
eng = create_engine("mssql+pymssql://user:pass@host/db",
deprecate_large_types=True)
* Complete control over whether the "old" or "new" types are rendered is
available in all SQLAlchemy versions by using the UPPERCASE type objects
instead: :class:`.NVARCHAR`, :class:`.VARCHAR`, :class:`.types.VARBINARY`,
:class:`.TEXT`, :class:`.mssql.NTEXT`, :class:`.mssql.IMAGE` will always remain
fixed and always output exactly that type.
.. versionadded:: 1.0.0
.. _mssql_indexes:
Clustered Index Support
@ -367,19 +463,20 @@ import operator
import re
from ... import sql, schema as sa_schema, exc, util
from ...sql import compiler, expression, \
util as sql_util, cast
from ...sql import compiler, expression, util as sql_util
from ... import engine
from ...engine import reflection, default
from ... import types as sqltypes
from ...types import INTEGER, BIGINT, SMALLINT, DECIMAL, NUMERIC, \
FLOAT, TIMESTAMP, DATETIME, DATE, BINARY,\
VARBINARY, TEXT, VARCHAR, NVARCHAR, CHAR, NCHAR
TEXT, VARCHAR, NVARCHAR, CHAR, NCHAR
from ...util import update_wrapper
from . import information_schema as ischema
# http://sqlserverbuilds.blogspot.com/
MS_2012_VERSION = (11,)
MS_2008_VERSION = (10,)
MS_2005_VERSION = (9,)
MS_2000_VERSION = (8,)
@ -451,9 +548,13 @@ class _MSDate(sqltypes.Date):
if isinstance(value, datetime.datetime):
return value.date()
elif isinstance(value, util.string_types):
m = self._reg.match(value)
if not m:
raise ValueError(
"could not parse %r as a date value" % (value, ))
return datetime.date(*[
int(x or 0)
for x in self._reg.match(value).groups()
for x in m.groups()
])
else:
return value
@ -485,9 +586,13 @@ class TIME(sqltypes.TIME):
if isinstance(value, datetime.datetime):
return value.time()
elif isinstance(value, util.string_types):
m = self._reg.match(value)
if not m:
raise ValueError(
"could not parse %r as a time value" % (value, ))
return datetime.time(*[
int(x or 0)
for x in self._reg.match(value).groups()])
for x in m.groups()])
else:
return value
return process
@ -545,6 +650,26 @@ class NTEXT(sqltypes.UnicodeText):
__visit_name__ = 'NTEXT'
class VARBINARY(sqltypes.VARBINARY, sqltypes.LargeBinary):
"""The MSSQL VARBINARY type.
This type extends both :class:`.types.VARBINARY` and
:class:`.types.LargeBinary`. In "deprecate_large_types" mode,
the :class:`.types.LargeBinary` type will produce ``VARBINARY(max)``
on SQL Server.
.. versionadded:: 1.0.0
.. seealso::
:ref:`mssql_large_type_deprecation`
"""
__visit_name__ = 'VARBINARY'
class IMAGE(sqltypes.LargeBinary):
__visit_name__ = 'IMAGE'
@ -626,7 +751,6 @@ ischema_names = {
class MSTypeCompiler(compiler.GenericTypeCompiler):
def _extend(self, spec, type_, length=None):
"""Extend a string-type declaration with standard SQL
COLLATE annotations.
@ -647,103 +771,115 @@ class MSTypeCompiler(compiler.GenericTypeCompiler):
return ' '.join([c for c in (spec, collation)
if c is not None])
def visit_FLOAT(self, type_):
def visit_FLOAT(self, type_, **kw):
precision = getattr(type_, 'precision', None)
if precision is None:
return "FLOAT"
else:
return "FLOAT(%(precision)s)" % {'precision': precision}
def visit_TINYINT(self, type_):
def visit_TINYINT(self, type_, **kw):
return "TINYINT"
def visit_DATETIMEOFFSET(self, type_):
if type_.precision:
def visit_DATETIMEOFFSET(self, type_, **kw):
if type_.precision is not None:
return "DATETIMEOFFSET(%s)" % type_.precision
else:
return "DATETIMEOFFSET"
def visit_TIME(self, type_):
def visit_TIME(self, type_, **kw):
precision = getattr(type_, 'precision', None)
if precision:
if precision is not None:
return "TIME(%s)" % precision
else:
return "TIME"
def visit_DATETIME2(self, type_):
def visit_DATETIME2(self, type_, **kw):
precision = getattr(type_, 'precision', None)
if precision:
if precision is not None:
return "DATETIME2(%s)" % precision
else:
return "DATETIME2"
def visit_SMALLDATETIME(self, type_):
def visit_SMALLDATETIME(self, type_, **kw):
return "SMALLDATETIME"
def visit_unicode(self, type_):
return self.visit_NVARCHAR(type_)
def visit_unicode(self, type_, **kw):
return self.visit_NVARCHAR(type_, **kw)
def visit_unicode_text(self, type_):
return self.visit_NTEXT(type_)
def visit_text(self, type_, **kw):
if self.dialect.deprecate_large_types:
return self.visit_VARCHAR(type_, **kw)
else:
return self.visit_TEXT(type_, **kw)
def visit_NTEXT(self, type_):
def visit_unicode_text(self, type_, **kw):
if self.dialect.deprecate_large_types:
return self.visit_NVARCHAR(type_, **kw)
else:
return self.visit_NTEXT(type_, **kw)
def visit_NTEXT(self, type_, **kw):
return self._extend("NTEXT", type_)
def visit_TEXT(self, type_):
def visit_TEXT(self, type_, **kw):
return self._extend("TEXT", type_)
def visit_VARCHAR(self, type_):
def visit_VARCHAR(self, type_, **kw):
return self._extend("VARCHAR", type_, length=type_.length or 'max')
def visit_CHAR(self, type_):
def visit_CHAR(self, type_, **kw):
return self._extend("CHAR", type_)
def visit_NCHAR(self, type_):
def visit_NCHAR(self, type_, **kw):
return self._extend("NCHAR", type_)
def visit_NVARCHAR(self, type_):
def visit_NVARCHAR(self, type_, **kw):
return self._extend("NVARCHAR", type_, length=type_.length or 'max')
def visit_date(self, type_):
def visit_date(self, type_, **kw):
if self.dialect.server_version_info < MS_2008_VERSION:
return self.visit_DATETIME(type_)
return self.visit_DATETIME(type_, **kw)
else:
return self.visit_DATE(type_)
return self.visit_DATE(type_, **kw)
def visit_time(self, type_):
def visit_time(self, type_, **kw):
if self.dialect.server_version_info < MS_2008_VERSION:
return self.visit_DATETIME(type_)
return self.visit_DATETIME(type_, **kw)
else:
return self.visit_TIME(type_)
return self.visit_TIME(type_, **kw)
def visit_large_binary(self, type_):
return self.visit_IMAGE(type_)
def visit_large_binary(self, type_, **kw):
if self.dialect.deprecate_large_types:
return self.visit_VARBINARY(type_, **kw)
else:
return self.visit_IMAGE(type_, **kw)
def visit_IMAGE(self, type_):
def visit_IMAGE(self, type_, **kw):
return "IMAGE"
def visit_VARBINARY(self, type_):
def visit_VARBINARY(self, type_, **kw):
return self._extend(
"VARBINARY",
type_,
length=type_.length or 'max')
def visit_boolean(self, type_):
def visit_boolean(self, type_, **kw):
return self.visit_BIT(type_)
def visit_BIT(self, type_):
def visit_BIT(self, type_, **kw):
return "BIT"
def visit_MONEY(self, type_):
def visit_MONEY(self, type_, **kw):
return "MONEY"
def visit_SMALLMONEY(self, type_):
def visit_SMALLMONEY(self, type_, **kw):
return 'SMALLMONEY'
def visit_UNIQUEIDENTIFIER(self, type_):
def visit_UNIQUEIDENTIFIER(self, type_, **kw):
return "UNIQUEIDENTIFIER"
def visit_SQL_VARIANT(self, type_):
def visit_SQL_VARIANT(self, type_, **kw):
return 'SQL_VARIANT'
@ -846,7 +982,7 @@ class MSExecutionContext(default.DefaultExecutionContext):
"SET IDENTITY_INSERT %s OFF" %
self.dialect.identifier_preparer. format_table(
self.compiled.statement.table)))
except:
except Exception:
pass
def get_result_proxy(self):
@ -872,6 +1008,15 @@ class MSSQLCompiler(compiler.SQLCompiler):
self.tablealiases = {}
super(MSSQLCompiler, self).__init__(*args, **kwargs)
def _with_legacy_schema_aliasing(fn):
def decorate(self, *arg, **kw):
if self.dialect.legacy_schema_aliasing:
return fn(self, *arg, **kw)
else:
super_ = getattr(super(MSSQLCompiler, self), fn.__name__)
return super_(*arg, **kw)
return decorate
def visit_now_func(self, fn, **kw):
return "CURRENT_TIMESTAMP"
@ -900,19 +1045,24 @@ class MSSQLCompiler(compiler.SQLCompiler):
self.process(binary.left, **kw),
self.process(binary.right, **kw))
def get_select_precolumns(self, select):
""" MS-SQL puts TOP, its version of LIMIT, here """
if select._distinct or select._limit is not None:
s = select._distinct and "DISTINCT " or ""
def get_select_precolumns(self, select, **kw):
""" MS-SQL puts TOP, it's version of LIMIT here """
s = ""
if select._distinct:
s += "DISTINCT "
if select._simple_int_limit and not select._offset:
# ODBC drivers and possibly others
# don't support bind params in the SELECT clause on SQL Server.
# so have to use literal here.
if select._limit is not None:
if not select._offset:
s += "TOP %d " % select._limit
s += "TOP %d " % select._limit
if s:
return s
return compiler.SQLCompiler.get_select_precolumns(self, select)
else:
return compiler.SQLCompiler.get_select_precolumns(
self, select, **kw)
def get_from_hint_text(self, table, text):
return text
@ -920,7 +1070,7 @@ class MSSQLCompiler(compiler.SQLCompiler):
def get_crud_hint_text(self, table, text):
return text
def limit_clause(self, select):
def limit_clause(self, select, **kw):
# Limit in mssql is after the select keyword
return ""
@ -929,39 +1079,48 @@ class MSSQLCompiler(compiler.SQLCompiler):
so tries to wrap it in a subquery with ``row_number()`` criterion.
"""
if select._offset and not getattr(select, '_mssql_visit', None):
if (
(
not select._simple_int_limit and
select._limit_clause is not None
) or (
select._offset_clause is not None and
not select._simple_int_offset or select._offset
)
) and not getattr(select, '_mssql_visit', None):
# to use ROW_NUMBER(), an ORDER BY is required.
if not select._order_by_clause.clauses:
raise exc.CompileError('MSSQL requires an order_by when '
'using an offset.')
_offset = select._offset
_limit = select._limit
'using an OFFSET or a non-simple '
'LIMIT clause')
_order_by_clauses = select._order_by_clause.clauses
limit_clause = select._limit_clause
offset_clause = select._offset_clause
kwargs['select_wraps_for'] = select
select = select._generate()
select._mssql_visit = True
select = select.column(
sql.func.ROW_NUMBER().over(order_by=_order_by_clauses)
.label("mssql_rn")
).order_by(None).alias()
.label("mssql_rn")).order_by(None).alias()
mssql_rn = sql.column('mssql_rn')
limitselect = sql.select([c for c in select.c if
c.key != 'mssql_rn'])
limitselect.append_whereclause(mssql_rn > _offset)
if _limit is not None:
limitselect.append_whereclause(mssql_rn <= (_limit + _offset))
return self.process(limitselect, iswrapper=True, **kwargs)
if offset_clause is not None:
limitselect.append_whereclause(mssql_rn > offset_clause)
if limit_clause is not None:
limitselect.append_whereclause(
mssql_rn <= (limit_clause + offset_clause))
else:
limitselect.append_whereclause(
mssql_rn <= (limit_clause))
return self.process(limitselect, **kwargs)
else:
return compiler.SQLCompiler.visit_select(self, select, **kwargs)
def _schema_aliased_table(self, table):
if getattr(table, 'schema', None) is not None:
if table not in self.tablealiases:
self.tablealiases[table] = table.alias()
return self.tablealiases[table]
else:
return None
@_with_legacy_schema_aliasing
def visit_table(self, table, mssql_aliased=False, iscrud=False, **kwargs):
if mssql_aliased is table or iscrud:
return super(MSSQLCompiler, self).visit_table(table, **kwargs)
@ -973,25 +1132,14 @@ class MSSQLCompiler(compiler.SQLCompiler):
else:
return super(MSSQLCompiler, self).visit_table(table, **kwargs)
def visit_alias(self, alias, **kwargs):
@_with_legacy_schema_aliasing
def visit_alias(self, alias, **kw):
# translate for schema-qualified table aliases
kwargs['mssql_aliased'] = alias.original
return super(MSSQLCompiler, self).visit_alias(alias, **kwargs)
kw['mssql_aliased'] = alias.original
return super(MSSQLCompiler, self).visit_alias(alias, **kw)
def visit_extract(self, extract, **kw):
field = self.extract_map.get(extract.field, extract.field)
return 'DATEPART("%s", %s)' % \
(field, self.process(extract.expr, **kw))
def visit_savepoint(self, savepoint_stmt):
return "SAVE TRANSACTION %s" % \
self.preparer.format_savepoint(savepoint_stmt)
def visit_rollback_to_savepoint(self, savepoint_stmt):
return ("ROLLBACK TRANSACTION %s"
% self.preparer.format_savepoint(savepoint_stmt))
def visit_column(self, column, add_to_result_map=None, **kwargs):
@_with_legacy_schema_aliasing
def visit_column(self, column, add_to_result_map=None, **kw):
if column.table is not None and \
(not self.isupdate and not self.isdelete) or \
self.is_subquery():
@ -1009,10 +1157,40 @@ class MSSQLCompiler(compiler.SQLCompiler):
)
return super(MSSQLCompiler, self).\
visit_column(converted, **kwargs)
visit_column(converted, **kw)
return super(MSSQLCompiler, self).visit_column(
column, add_to_result_map=add_to_result_map, **kwargs)
column, add_to_result_map=add_to_result_map, **kw)
def _schema_aliased_table(self, table):
if getattr(table, 'schema', None) is not None:
if self.dialect._warn_schema_aliasing and \
table.schema.lower() != 'information_schema':
util.warn(
"legacy_schema_aliasing flag is defaulted to True; "
"some schema-qualified queries may not function "
"correctly. Consider setting this flag to False for "
"modern SQL Server versions; this flag will default to "
"False in version 1.1")
if table not in self.tablealiases:
self.tablealiases[table] = table.alias()
return self.tablealiases[table]
else:
return None
def visit_extract(self, extract, **kw):
field = self.extract_map.get(extract.field, extract.field)
return 'DATEPART(%s, %s)' % \
(field, self.process(extract.expr, **kw))
def visit_savepoint(self, savepoint_stmt):
return "SAVE TRANSACTION %s" % \
self.preparer.format_savepoint(savepoint_stmt)
def visit_rollback_to_savepoint(self, savepoint_stmt):
return ("ROLLBACK TRANSACTION %s"
% self.preparer.format_savepoint(savepoint_stmt))
def visit_binary(self, binary, **kwargs):
"""Move bind parameters to the right-hand side of an operator, where
@ -1141,8 +1319,11 @@ class MSSQLStrictCompiler(MSSQLCompiler):
class MSDDLCompiler(compiler.DDLCompiler):
def get_column_specification(self, column, **kwargs):
colspec = (self.preparer.format_column(column) + " "
+ self.dialect.type_compiler.process(column.type))
colspec = (
self.preparer.format_column(column) + " "
+ self.dialect.type_compiler.process(
column.type, type_expression=column)
)
if column.nullable is not None:
if not column.nullable or column.primary_key or \
@ -1321,6 +1502,10 @@ class MSDialect(default.DefaultDialect):
sqltypes.Time: TIME,
}
engine_config_types = default.DefaultDialect.engine_config_types.union([
('legacy_schema_aliasing', util.asbool),
])
ischema_names = ischema_names
supports_native_boolean = False
@ -1351,13 +1536,24 @@ class MSDialect(default.DefaultDialect):
query_timeout=None,
use_scope_identity=True,
max_identifier_length=None,
schema_name="dbo", **opts):
schema_name="dbo",
deprecate_large_types=None,
legacy_schema_aliasing=None, **opts):
self.query_timeout = int(query_timeout or 0)
self.schema_name = schema_name
self.use_scope_identity = use_scope_identity
self.max_identifier_length = int(max_identifier_length or 0) or \
self.max_identifier_length
self.deprecate_large_types = deprecate_large_types
if legacy_schema_aliasing is None:
self.legacy_schema_aliasing = True
self._warn_schema_aliasing = True
else:
self.legacy_schema_aliasing = legacy_schema_aliasing
self._warn_schema_aliasing = False
super(MSDialect, self).__init__(**opts)
def do_savepoint(self, connection, name):
@ -1371,21 +1567,31 @@ class MSDialect(default.DefaultDialect):
def initialize(self, connection):
super(MSDialect, self).initialize(connection)
self._setup_version_attributes()
def _setup_version_attributes(self):
if self.server_version_info[0] not in list(range(8, 17)):
# FreeTDS with version 4.2 seems to report here
# a number like "95.10.255". Don't know what
# that is. So emit warning.
# Use TDS Version 7.0 through 7.3, per the MS information here:
# https://msdn.microsoft.com/en-us/library/dd339982.aspx
# and FreeTDS information here (7.3 highest supported version):
# http://www.freetds.org/userguide/choosingtdsprotocol.htm
util.warn(
"Unrecognized server version info '%s'. Version specific "
"behaviors may not function properly. If using ODBC "
"with FreeTDS, ensure server version 7.0 or 8.0, not 4.2, "
"is configured in the FreeTDS configuration." %
"with FreeTDS, ensure TDS_VERSION 7.0 through 7.3, not "
"4.2, is configured in the FreeTDS configuration." %
".".join(str(x) for x in self.server_version_info))
if self.server_version_info >= MS_2005_VERSION and \
'implicit_returning' not in self.__dict__:
self.implicit_returning = True
if self.server_version_info >= MS_2008_VERSION:
self.supports_multivalues_insert = True
if self.deprecate_large_types is None:
self.deprecate_large_types = \
self.server_version_info >= MS_2012_VERSION
def _get_default_schema_name(self, connection):
if self.server_version_info < MS_2005_VERSION:
@ -1573,12 +1779,11 @@ class MSDialect(default.DefaultDialect):
if coltype in (MSString, MSChar, MSNVarchar, MSNChar, MSText,
MSNText, MSBinary, MSVarBinary,
sqltypes.LargeBinary):
if charlen == -1:
charlen = 'max'
kwargs['length'] = charlen
if collation:
kwargs['collation'] = collation
if coltype == MSText or \
(coltype in (MSString, MSNVarchar) and charlen == -1):
kwargs.pop('length')
if coltype is None:
util.warn(

2
lib/python3.5/site-packages/sqlalchemy/dialects/mssql/information_schema.py
View file

@ -1,5 +1,5 @@
# mssql/information_schema.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under

2
lib/python3.5/site-packages/sqlalchemy/dialects/mssql/mxodbc.py
View file

@ -1,5 +1,5 @@
# mssql/mxodbc.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under

16
lib/python3.5/site-packages/sqlalchemy/dialects/mssql/pymssql.py
View file

@ -1,5 +1,5 @@
# mssql/pymssql.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -46,11 +46,12 @@ class MSDialect_pymssql(MSDialect):
@classmethod
def dbapi(cls):
module = __import__('pymssql')
# pymmsql doesn't have a Binary method. we use string
# TODO: monkeypatching here is less than ideal
module.Binary = lambda x: x if hasattr(x, 'decode') else str(x)
# pymmsql < 2.1.1 doesn't have a Binary method. we use string
client_ver = tuple(int(x) for x in module.__version__.split("."))
if client_ver < (2, 1, 1):
# TODO: monkeypatching here is less than ideal
module.Binary = lambda x: x if hasattr(x, 'decode') else str(x)
if client_ver < (1, ):
util.warn("The pymssql dialect expects at least "
"the 1.0 series of the pymssql DBAPI.")
@ -63,7 +64,7 @@ class MSDialect_pymssql(MSDialect):
def _get_server_version_info(self, connection):
vers = connection.scalar("select @@version")
m = re.match(
r"Microsoft SQL Server.*? - (\d+).(\d+).(\d+).(\d+)", vers)
r"Microsoft .*? - (\d+).(\d+).(\d+).(\d+)", vers)
if m:
return tuple(int(x) for x in m.group(1, 2, 3, 4))
else:
@ -84,7 +85,8 @@ class MSDialect_pymssql(MSDialect):
"message 20003", # connection timeout
"Error 10054",
"Not connected to any MS SQL server",
"Connection is closed"
"Connection is closed",
"message 20006", # Write to the server failed
):
if msg in str(e):
return True

111
lib/python3.5/site-packages/sqlalchemy/dialects/mssql/pyodbc.py
View file

@ -1,5 +1,5 @@
# mssql/pyodbc.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -12,74 +12,57 @@
:connectstring: mssql+pyodbc://<username>:<password>@<dsnname>
:url: http://pypi.python.org/pypi/pyodbc/
Additional Connection Examples
-------------------------------
Connecting to PyODBC
--------------------
Examples of pyodbc connection string URLs:
The URL here is to be translated to PyODBC connection strings, as
detailed in `ConnectionStrings <https://code.google.com/p/pyodbc/wiki/ConnectionStrings>`_.
* ``mssql+pyodbc://mydsn`` - connects using the specified DSN named ``mydsn``.
The connection string that is created will appear like::
DSN Connections
^^^^^^^^^^^^^^^
dsn=mydsn;Trusted_Connection=Yes
A DSN-based connection is **preferred** overall when using ODBC. A
basic DSN-based connection looks like::
* ``mssql+pyodbc://user:pass@mydsn`` - connects using the DSN named
``mydsn`` passing in the ``UID`` and ``PWD`` information. The
connection string that is created will appear like::
engine = create_engine("mssql+pyodbc://scott:tiger@some_dsn")
Which above, will pass the following connection string to PyODBC::
dsn=mydsn;UID=user;PWD=pass
* ``mssql+pyodbc://user:pass@mydsn/?LANGUAGE=us_english`` - connects
using the DSN named ``mydsn`` passing in the ``UID`` and ``PWD``
information, plus the additional connection configuration option
``LANGUAGE``. The connection string that is created will appear
like::
If the username and password are omitted, the DSN form will also add
the ``Trusted_Connection=yes`` directive to the ODBC string.
dsn=mydsn;UID=user;PWD=pass;LANGUAGE=us_english
Hostname Connections
^^^^^^^^^^^^^^^^^^^^
* ``mssql+pyodbc://user:pass@host/db`` - connects using a connection
that would appear like::
Hostname-based connections are **not preferred**, however are supported.
The ODBC driver name must be explicitly specified::
DRIVER={SQL Server};Server=host;Database=db;UID=user;PWD=pass
engine = create_engine("mssql+pyodbc://scott:tiger@myhost:port/databasename?driver=SQL+Server+Native+Client+10.0")
* ``mssql+pyodbc://user:pass@host:123/db`` - connects using a connection
string which includes the port
information using the comma syntax. This will create the following
connection string::
.. versionchanged:: 1.0.0 Hostname-based PyODBC connections now require the
SQL Server driver name specified explicitly. SQLAlchemy cannot
choose an optimal default here as it varies based on platform
and installed drivers.
DRIVER={SQL Server};Server=host,123;Database=db;UID=user;PWD=pass
Other keywords interpreted by the Pyodbc dialect to be passed to
``pyodbc.connect()`` in both the DSN and hostname cases include:
``odbc_autotranslate``, ``ansi``, ``unicode_results``, ``autocommit``.
* ``mssql+pyodbc://user:pass@host/db?port=123`` - connects using a connection
string that includes the port
information as a separate ``port`` keyword. This will create the
following connection string::
Pass through exact Pyodbc string
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
DRIVER={SQL Server};Server=host;Database=db;UID=user;PWD=pass;port=123
A PyODBC connection string can also be sent exactly as specified in
`ConnectionStrings <https://code.google.com/p/pyodbc/wiki/ConnectionStrings>`_
into the driver using the parameter ``odbc_connect``. The delimeters must be URL escaped, however,
as illustrated below using ``urllib.quote_plus``::
* ``mssql+pyodbc://user:pass@host/db?driver=MyDriver`` - connects using a
connection string that includes a custom ODBC driver name. This will create
the following connection string::
import urllib
params = urllib.quote_plus("DRIVER={SQL Server Native Client 10.0};SERVER=dagger;DATABASE=test;UID=user;PWD=password")
DRIVER={MyDriver};Server=host;Database=db;UID=user;PWD=pass
engine = create_engine("mssql+pyodbc:///?odbc_connect=%s" % params)
If you require a connection string that is outside the options
presented above, use the ``odbc_connect`` keyword to pass in a
urlencoded connection string. What gets passed in will be urldecoded
and passed directly.
For example::
mssql+pyodbc:///?odbc_connect=dsn%3Dmydsn%3BDatabase%3Ddb
would create the following connection string::
dsn=mydsn;Database=db
Encoding your connection string can be easily accomplished through
the python shell. For example::
>>> import urllib
>>> urllib.quote_plus('dsn=mydsn;Database=db')
'dsn%3Dmydsn%3BDatabase%3Ddb'
Unicode Binds
-------------
@ -112,7 +95,7 @@ for unix + PyODBC.
"""
from .base import MSExecutionContext, MSDialect
from .base import MSExecutionContext, MSDialect, VARBINARY
from ...connectors.pyodbc import PyODBCConnector
from ... import types as sqltypes, util
import decimal
@ -191,6 +174,22 @@ class _MSFloat_pyodbc(_ms_numeric_pyodbc, sqltypes.Float):
pass
class _VARBINARY_pyodbc(VARBINARY):
def bind_processor(self, dialect):
if dialect.dbapi is None:
return None
DBAPIBinary = dialect.dbapi.Binary
def process(value):
if value is not None:
return DBAPIBinary(value)
else:
# pyodbc-specific
return dialect.dbapi.BinaryNull
return process
class MSExecutionContext_pyodbc(MSExecutionContext):
_embedded_scope_identity = False
@ -243,13 +242,13 @@ class MSDialect_pyodbc(PyODBCConnector, MSDialect):
execution_ctx_cls = MSExecutionContext_pyodbc
pyodbc_driver_name = 'SQL Server'
colspecs = util.update_copy(
MSDialect.colspecs,
{
sqltypes.Numeric: _MSNumeric_pyodbc,
sqltypes.Float: _MSFloat_pyodbc
sqltypes.Float: _MSFloat_pyodbc,
VARBINARY: _VARBINARY_pyodbc,
sqltypes.LargeBinary: _VARBINARY_pyodbc,
}
)

4
lib/python3.5/site-packages/sqlalchemy/dialects/mssql/zxjdbc.py
View file

@ -1,5 +1,5 @@
# mssql/zxjdbc.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -13,6 +13,8 @@
[?key=value&key=value...]
:driverurl: http://jtds.sourceforge.net/
.. note:: Jython is not supported by current versions of SQLAlchemy. The
zxjdbc dialect should be considered as experimental.
"""
from ...connectors.zxJDBC import ZxJDBCConnector

2
lib/python3.5/site-packages/sqlalchemy/dialects/mysql/__init__.py
View file

@ -1,5 +1,5 @@
# mysql/__init__.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under

632
lib/python3.5/site-packages/sqlalchemy/dialects/mysql/base.py
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File diff suppressed because it is too large Load diff

2
lib/python3.5/site-packages/sqlalchemy/dialects/mysql/cymysql.py
View file

@ -1,5 +1,5 @@
# mysql/cymysql.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under

18
lib/python3.5/site-packages/sqlalchemy/dialects/mysql/gaerdbms.py
View file

@ -1,5 +1,5 @@
# mysql/gaerdbms.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -17,6 +17,13 @@ developers-guide
.. versionadded:: 0.7.8
.. deprecated:: 1.0 This dialect is **no longer necessary** for
Google Cloud SQL; the MySQLdb dialect can be used directly.
Cloud SQL now recommends creating connections via the
mysql dialect using the URL format
``mysql+mysqldb://root@/<dbname>?unix_socket=/cloudsql/<projectid>:<instancename>``
Pooling
-------
@ -33,6 +40,7 @@ import os
from .mysqldb import MySQLDialect_mysqldb
from ...pool import NullPool
import re
from sqlalchemy.util import warn_deprecated
def _is_dev_environment():
@ -43,6 +51,14 @@ class MySQLDialect_gaerdbms(MySQLDialect_mysqldb):
@classmethod
def dbapi(cls):
warn_deprecated(
"Google Cloud SQL now recommends creating connections via the "
"MySQLdb dialect directly, using the URL format "
"mysql+mysqldb://root@/<dbname>?unix_socket=/cloudsql/"
"<projectid>:<instancename>"
)
# from django:
# http://code.google.com/p/googleappengine/source/
# browse/trunk/python/google/storage/speckle/

60
lib/python3.5/site-packages/sqlalchemy/dialects/mysql/mysqlconnector.py
View file

@ -1,5 +1,5 @@
# mysql/mysqlconnector.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -14,6 +14,12 @@
:url: http://dev.mysql.com/downloads/connector/python/
Unicode
-------
Please see :ref:`mysql_unicode` for current recommendations on unicode
handling.
"""
from .base import (MySQLDialect, MySQLExecutionContext,
@ -21,6 +27,7 @@ from .base import (MySQLDialect, MySQLExecutionContext,
BIT)
from ... import util
import re
class MySQLExecutionContext_mysqlconnector(MySQLExecutionContext):
@ -31,18 +38,34 @@ class MySQLExecutionContext_mysqlconnector(MySQLExecutionContext):
class MySQLCompiler_mysqlconnector(MySQLCompiler):
def visit_mod_binary(self, binary, operator, **kw):
return self.process(binary.left, **kw) + " %% " + \
self.process(binary.right, **kw)
if self.dialect._mysqlconnector_double_percents:
return self.process(binary.left, **kw) + " %% " + \
self.process(binary.right, **kw)
else:
return self.process(binary.left, **kw) + " % " + \
self.process(binary.right, **kw)
def post_process_text(self, text):
return text.replace('%', '%%')
if self.dialect._mysqlconnector_double_percents:
return text.replace('%', '%%')
else:
return text
def escape_literal_column(self, text):
if self.dialect._mysqlconnector_double_percents:
return text.replace('%', '%%')
else:
return text
class MySQLIdentifierPreparer_mysqlconnector(MySQLIdentifierPreparer):
def _escape_identifier(self, value):
value = value.replace(self.escape_quote, self.escape_to_quote)
return value.replace("%", "%%")
if self.dialect._mysqlconnector_double_percents:
return value.replace("%", "%%")
else:
return value
class _myconnpyBIT(BIT):
@ -55,8 +78,6 @@ class _myconnpyBIT(BIT):
class MySQLDialect_mysqlconnector(MySQLDialect):
driver = 'mysqlconnector'
if util.py2k:
supports_unicode_statements = False
supports_unicode_binds = True
supports_sane_rowcount = True
@ -77,6 +98,10 @@ class MySQLDialect_mysqlconnector(MySQLDialect):
}
)
@util.memoized_property
def supports_unicode_statements(self):
return util.py3k or self._mysqlconnector_version_info > (2, 0)
@classmethod
def dbapi(cls):
from mysql import connector
@ -89,8 +114,10 @@ class MySQLDialect_mysqlconnector(MySQLDialect):
util.coerce_kw_type(opts, 'buffered', bool)
util.coerce_kw_type(opts, 'raise_on_warnings', bool)
# unfortunately, MySQL/connector python refuses to release a
# cursor without reading fully, so non-buffered isn't an option
opts.setdefault('buffered', True)
opts.setdefault('raise_on_warnings', True)
# FOUND_ROWS must be set in ClientFlag to enable
# supports_sane_rowcount.
@ -101,10 +128,25 @@ class MySQLDialect_mysqlconnector(MySQLDialect):
'client_flags', ClientFlag.get_default())
client_flags |= ClientFlag.FOUND_ROWS
opts['client_flags'] = client_flags
except:
except Exception:
pass
return [[], opts]
@util.memoized_property
def _mysqlconnector_version_info(self):
if self.dbapi and hasattr(self.dbapi, '__version__'):
m = re.match(r'(\d+)\.(\d+)(?:\.(\d+))?',
self.dbapi.__version__)
if m:
return tuple(
int(x)
for x in m.group(1, 2, 3)
if x is not None)
@util.memoized_property
def _mysqlconnector_double_percents(self):
return not util.py3k and self._mysqlconnector_version_info < (2, 0)
def _get_server_version_info(self, connection):
dbapi_con = connection.connection
version = dbapi_con.get_server_version()

180
lib/python3.5/site-packages/sqlalchemy/dialects/mysql/mysqldb.py
View file

@ -1,5 +1,5 @@
# mysql/mysqldb.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -13,78 +13,101 @@
:connectstring: mysql+mysqldb://<user>:<password>@<host>[:<port>]/<dbname>
:url: http://sourceforge.net/projects/mysql-python
.. _mysqldb_unicode:
Unicode
-------
MySQLdb requires a "charset" parameter to be passed in order for it
to handle non-ASCII characters correctly. When this parameter is passed,
MySQLdb will also implicitly set the "use_unicode" flag to true, which means
that it will return Python unicode objects instead of bytestrings.
However, SQLAlchemy's decode process, when C extensions are enabled,
is orders of magnitude faster than that of MySQLdb as it does not call into
Python functions to do so. Therefore, the **recommended URL to use for
unicode** will include both charset and use_unicode=0::
Please see :ref:`mysql_unicode` for current recommendations on unicode
handling.
create_engine("mysql+mysqldb://user:pass@host/dbname?charset=utf8&use_unicode=0")
Py3K Support
------------
As of this writing, MySQLdb only runs on Python 2. It is not known how
MySQLdb behaves on Python 3 as far as unicode decoding.
Currently, MySQLdb only runs on Python 2 and development has been stopped.
`mysqlclient`_ is fork of MySQLdb and provides Python 3 support as well
as some bugfixes.
.. _mysqlclient: https://github.com/PyMySQL/mysqlclient-python
Known Issues
-------------
Using MySQLdb with Google Cloud SQL
-----------------------------------
MySQL-python version 1.2.2 has a serious memory leak related
to unicode conversion, a feature which is disabled via ``use_unicode=0``.
It is strongly advised to use the latest version of MySQL-Python.
Google Cloud SQL now recommends use of the MySQLdb dialect. Connect
using a URL like the following::
mysql+mysqldb://root@/<dbname>?unix_socket=/cloudsql/<projectid>:<instancename>
"""
from .base import (MySQLDialect, MySQLExecutionContext,
MySQLCompiler, MySQLIdentifierPreparer)
from ...connectors.mysqldb import (
MySQLDBExecutionContext,
MySQLDBCompiler,
MySQLDBIdentifierPreparer,
MySQLDBConnector
)
from .base import TEXT
from ... import sql
from ... import util
import re
class MySQLExecutionContext_mysqldb(
MySQLDBExecutionContext,
MySQLExecutionContext):
pass
class MySQLExecutionContext_mysqldb(MySQLExecutionContext):
@property
def rowcount(self):
if hasattr(self, '_rowcount'):
return self._rowcount
else:
return self.cursor.rowcount
class MySQLCompiler_mysqldb(MySQLDBCompiler, MySQLCompiler):
pass
class MySQLCompiler_mysqldb(MySQLCompiler):
def visit_mod_binary(self, binary, operator, **kw):
return self.process(binary.left, **kw) + " %% " + \
self.process(binary.right, **kw)
def post_process_text(self, text):
return text.replace('%', '%%')
class MySQLIdentifierPreparer_mysqldb(
MySQLDBIdentifierPreparer,
MySQLIdentifierPreparer):
pass
class MySQLIdentifierPreparer_mysqldb(MySQLIdentifierPreparer):
def _escape_identifier(self, value):
value = value.replace(self.escape_quote, self.escape_to_quote)
return value.replace("%", "%%")
class MySQLDialect_mysqldb(MySQLDBConnector, MySQLDialect):
class MySQLDialect_mysqldb(MySQLDialect):
driver = 'mysqldb'
supports_unicode_statements = True
supports_sane_rowcount = True
supports_sane_multi_rowcount = True
supports_native_decimal = True
default_paramstyle = 'format'
execution_ctx_cls = MySQLExecutionContext_mysqldb
statement_compiler = MySQLCompiler_mysqldb
preparer = MySQLIdentifierPreparer_mysqldb
@classmethod
def dbapi(cls):
return __import__('MySQLdb')
def do_executemany(self, cursor, statement, parameters, context=None):
rowcount = cursor.executemany(statement, parameters)
if context is not None:
context._rowcount = rowcount
def _check_unicode_returns(self, connection):
# work around issue fixed in
# https://github.com/farcepest/MySQLdb1/commit/cd44524fef63bd3fcb71947392326e9742d520e8
# specific issue w/ the utf8_bin collation and unicode returns
has_utf8_bin = connection.scalar(
"show collation where %s = 'utf8' and %s = 'utf8_bin'"
% (
self.identifier_preparer.quote("Charset"),
self.identifier_preparer.quote("Collation")
))
has_utf8_bin = self.server_version_info > (5, ) and \
connection.scalar(
"show collation where %s = 'utf8' and %s = 'utf8_bin'"
% (
self.identifier_preparer.quote("Charset"),
self.identifier_preparer.quote("Collation")
))
if has_utf8_bin:
additional_tests = [
sql.collate(sql.cast(
@ -94,7 +117,82 @@ class MySQLDialect_mysqldb(MySQLDBConnector, MySQLDialect):
]
else:
additional_tests = []
return super(MySQLDBConnector, self)._check_unicode_returns(
return super(MySQLDialect_mysqldb, self)._check_unicode_returns(
connection, additional_tests)
def create_connect_args(self, url):
opts = url.translate_connect_args(database='db', username='user',
password='passwd')
opts.update(url.query)
util.coerce_kw_type(opts, 'compress', bool)
util.coerce_kw_type(opts, 'connect_timeout', int)
util.coerce_kw_type(opts, 'read_timeout', int)
util.coerce_kw_type(opts, 'client_flag', int)
util.coerce_kw_type(opts, 'local_infile', int)
# Note: using either of the below will cause all strings to be
# returned as Unicode, both in raw SQL operations and with column
# types like String and MSString.
util.coerce_kw_type(opts, 'use_unicode', bool)
util.coerce_kw_type(opts, 'charset', str)
# Rich values 'cursorclass' and 'conv' are not supported via
# query string.
ssl = {}
keys = ['ssl_ca', 'ssl_key', 'ssl_cert', 'ssl_capath', 'ssl_cipher']
for key in keys:
if key in opts:
ssl[key[4:]] = opts[key]
util.coerce_kw_type(ssl, key[4:], str)
del opts[key]
if ssl:
opts['ssl'] = ssl
# FOUND_ROWS must be set in CLIENT_FLAGS to enable
# supports_sane_rowcount.
client_flag = opts.get('client_flag', 0)
if self.dbapi is not None:
try:
CLIENT_FLAGS = __import__(
self.dbapi.__name__ + '.constants.CLIENT'
).constants.CLIENT
client_flag |= CLIENT_FLAGS.FOUND_ROWS
except (AttributeError, ImportError):
self.supports_sane_rowcount = False
opts['client_flag'] = client_flag
return [[], opts]
def _get_server_version_info(self, connection):
dbapi_con = connection.connection
version = []
r = re.compile('[.\-]')
for n in r.split(dbapi_con.get_server_info()):
try:
version.append(int(n))
except ValueError:
version.append(n)
return tuple(version)
def _extract_error_code(self, exception):
return exception.args[0]
def _detect_charset(self, connection):
"""Sniff out the character set in use for connection results."""
try:
# note: the SQL here would be
# "SHOW VARIABLES LIKE 'character_set%%'"
cset_name = connection.connection.character_set_name
except AttributeError:
util.warn(
"No 'character_set_name' can be detected with "
"this MySQL-Python version; "
"please upgrade to a recent version of MySQL-Python. "
"Assuming latin1.")
return 'latin1'
else:
return cset_name()
dialect = MySQLDialect_mysqldb

18
lib/python3.5/site-packages/sqlalchemy/dialects/mysql/oursql.py
View file

@ -1,5 +1,5 @@
# mysql/oursql.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -16,22 +16,10 @@
Unicode
-------
oursql defaults to using ``utf8`` as the connection charset, but other
encodings may be used instead. Like the MySQL-Python driver, unicode support
can be completely disabled::
Please see :ref:`mysql_unicode` for current recommendations on unicode
handling.
# oursql sets the connection charset to utf8 automatically; all strings come
# back as utf8 str
create_engine('mysql+oursql:///mydb?use_unicode=0')
To not automatically use ``utf8`` and instead use whatever the connection
defaults to, there is a separate parameter::
# use the default connection charset; all strings come back as unicode
create_engine('mysql+oursql:///mydb?default_charset=1')
# use latin1 as the connection charset; all strings come back as unicode
create_engine('mysql+oursql:///mydb?charset=latin1')
"""
import re

18
lib/python3.5/site-packages/sqlalchemy/dialects/mysql/pymysql.py
View file

@ -1,5 +1,5 @@
# mysql/pymysql.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -12,7 +12,13 @@
:dbapi: pymysql
:connectstring: mysql+pymysql://<username>:<password>@<host>/<dbname>\
[?<options>]
:url: http://code.google.com/p/pymysql/
:url: http://www.pymysql.org/
Unicode
-------
Please see :ref:`mysql_unicode` for current recommendations on unicode
handling.
MySQL-Python Compatibility
--------------------------
@ -31,8 +37,12 @@ class MySQLDialect_pymysql(MySQLDialect_mysqldb):
driver = 'pymysql'
description_encoding = None
if py3k:
supports_unicode_statements = True
# generally, these two values should be both True
# or both False. PyMySQL unicode tests pass all the way back
# to 0.4 either way. See [ticket:3337]
supports_unicode_statements = True
supports_unicode_binds = True
@classmethod
def dbapi(cls):

15
lib/python3.5/site-packages/sqlalchemy/dialects/mysql/pyodbc.py
View file

@ -1,5 +1,5 @@
# mysql/pyodbc.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -14,14 +14,11 @@
:connectstring: mysql+pyodbc://<username>:<password>@<dsnname>
:url: http://pypi.python.org/pypi/pyodbc/
Limitations
-----------
The mysql-pyodbc dialect is subject to unresolved character encoding issues
which exist within the current ODBC drivers available.
(see http://code.google.com/p/pyodbc/issues/detail?id=25). Consider usage
of OurSQL, MySQLdb, or MySQL-connector/Python.
.. note:: The PyODBC for MySQL dialect is not well supported, and
is subject to unresolved character encoding issues
which exist within the current ODBC drivers available.
(see http://code.google.com/p/pyodbc/issues/detail?id=25).
Other dialects for MySQL are recommended.
"""

5
lib/python3.5/site-packages/sqlalchemy/dialects/mysql/zxjdbc.py
View file

@ -1,5 +1,5 @@
# mysql/zxjdbc.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -14,6 +14,9 @@
<database>
:driverurl: http://dev.mysql.com/downloads/connector/j/
.. note:: Jython is not supported by current versions of SQLAlchemy. The
zxjdbc dialect should be considered as experimental.
Character Sets
--------------

2
lib/python3.5/site-packages/sqlalchemy/dialects/oracle/__init__.py
View file

@ -1,5 +1,5 @@
# oracle/__init__.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under

358
lib/python3.5/site-packages/sqlalchemy/dialects/oracle/base.py
View file

@ -1,5 +1,5 @@
# oracle/base.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -213,15 +213,81 @@ is reflected and the type is reported as ``DATE``, the time-supporting
examining the type of column for use in special Python translations or
for migrating schemas to other database backends.
.. _oracle_table_options:
Oracle Table Options
-------------------------
The CREATE TABLE phrase supports the following options with Oracle
in conjunction with the :class:`.Table` construct:
* ``ON COMMIT``::
Table(
"some_table", metadata, ...,
prefixes=['GLOBAL TEMPORARY'], oracle_on_commit='PRESERVE ROWS')
.. versionadded:: 1.0.0
* ``COMPRESS``::
Table('mytable', metadata, Column('data', String(32)),
oracle_compress=True)
Table('mytable', metadata, Column('data', String(32)),
oracle_compress=6)
The ``oracle_compress`` parameter accepts either an integer compression
level, or ``True`` to use the default compression level.
.. versionadded:: 1.0.0
.. _oracle_index_options:
Oracle Specific Index Options
-----------------------------
Bitmap Indexes
~~~~~~~~~~~~~~
You can specify the ``oracle_bitmap`` parameter to create a bitmap index
instead of a B-tree index::
Index('my_index', my_table.c.data, oracle_bitmap=True)
Bitmap indexes cannot be unique and cannot be compressed. SQLAlchemy will not
check for such limitations, only the database will.
.. versionadded:: 1.0.0
Index compression
~~~~~~~~~~~~~~~~~
Oracle has a more efficient storage mode for indexes containing lots of
repeated values. Use the ``oracle_compress`` parameter to turn on key c
ompression::
Index('my_index', my_table.c.data, oracle_compress=True)
Index('my_index', my_table.c.data1, my_table.c.data2, unique=True,
oracle_compress=1)
The ``oracle_compress`` parameter accepts either an integer specifying the
number of prefix columns to compress, or ``True`` to use the default (all
columns for non-unique indexes, all but the last column for unique indexes).
.. versionadded:: 1.0.0
"""
import re
from sqlalchemy import util, sql
from sqlalchemy.engine import default, base, reflection
from sqlalchemy.engine import default, reflection
from sqlalchemy.sql import compiler, visitors, expression
from sqlalchemy.sql import (operators as sql_operators,
functions as sql_functions)
from sqlalchemy.sql import operators as sql_operators
from sqlalchemy.sql.elements import quoted_name
from sqlalchemy import types as sqltypes, schema as sa_schema
from sqlalchemy.types import VARCHAR, NVARCHAR, CHAR, \
BLOB, CLOB, TIMESTAMP, FLOAT
@ -300,7 +366,6 @@ class LONG(sqltypes.Text):
class DATE(sqltypes.DateTime):
"""Provide the oracle DATE type.
This type has no special Python behavior, except that it subclasses
@ -349,7 +414,6 @@ class INTERVAL(sqltypes.TypeEngine):
class ROWID(sqltypes.TypeEngine):
"""Oracle ROWID type.
When used in a cast() or similar, generates ROWID.
@ -359,7 +423,6 @@ class ROWID(sqltypes.TypeEngine):
class _OracleBoolean(sqltypes.Boolean):
def get_dbapi_type(self, dbapi):
return dbapi.NUMBER
@ -395,19 +458,19 @@ class OracleTypeCompiler(compiler.GenericTypeCompiler):
# Oracle does not allow milliseconds in DATE
# Oracle does not support TIME columns
def visit_datetime(self, type_):
return self.visit_DATE(type_)
def visit_datetime(self, type_, **kw):
return self.visit_DATE(type_, **kw)
def visit_float(self, type_):
return self.visit_FLOAT(type_)
def visit_float(self, type_, **kw):
return self.visit_FLOAT(type_, **kw)
def visit_unicode(self, type_):
def visit_unicode(self, type_, **kw):
if self.dialect._supports_nchar:
return self.visit_NVARCHAR2(type_)
return self.visit_NVARCHAR2(type_, **kw)
else:
return self.visit_VARCHAR2(type_)
return self.visit_VARCHAR2(type_, **kw)
def visit_INTERVAL(self, type_):
def visit_INTERVAL(self, type_, **kw):
return "INTERVAL DAY%s TO SECOND%s" % (
type_.day_precision is not None and
"(%d)" % type_.day_precision or
@ -417,22 +480,22 @@ class OracleTypeCompiler(compiler.GenericTypeCompiler):
"",
)
def visit_LONG(self, type_):
def visit_LONG(self, type_, **kw):
return "LONG"
def visit_TIMESTAMP(self, type_):
def visit_TIMESTAMP(self, type_, **kw):
if type_.timezone:
return "TIMESTAMP WITH TIME ZONE"
else:
return "TIMESTAMP"
def visit_DOUBLE_PRECISION(self, type_):
return self._generate_numeric(type_, "DOUBLE PRECISION")
def visit_DOUBLE_PRECISION(self, type_, **kw):
return self._generate_numeric(type_, "DOUBLE PRECISION", **kw)
def visit_NUMBER(self, type_, **kw):
return self._generate_numeric(type_, "NUMBER", **kw)
def _generate_numeric(self, type_, name, precision=None, scale=None):
def _generate_numeric(self, type_, name, precision=None, scale=None, **kw):
if precision is None:
precision = type_.precision
@ -448,17 +511,17 @@ class OracleTypeCompiler(compiler.GenericTypeCompiler):
n = "%(name)s(%(precision)s, %(scale)s)"
return n % {'name': name, 'precision': precision, 'scale': scale}
def visit_string(self, type_):
return self.visit_VARCHAR2(type_)
def visit_string(self, type_, **kw):
return self.visit_VARCHAR2(type_, **kw)
def visit_VARCHAR2(self, type_):
def visit_VARCHAR2(self, type_, **kw):
return self._visit_varchar(type_, '', '2')
def visit_NVARCHAR2(self, type_):
def visit_NVARCHAR2(self, type_, **kw):
return self._visit_varchar(type_, 'N', '2')
visit_NVARCHAR = visit_NVARCHAR2
def visit_VARCHAR(self, type_):
def visit_VARCHAR(self, type_, **kw):
return self._visit_varchar(type_, '', '')
def _visit_varchar(self, type_, n, num):
@ -471,36 +534,35 @@ class OracleTypeCompiler(compiler.GenericTypeCompiler):
varchar = "%(n)sVARCHAR%(two)s(%(length)s)"
return varchar % {'length': type_.length, 'two': num, 'n': n}
def visit_text(self, type_):
return self.visit_CLOB(type_)
def visit_text(self, type_, **kw):
return self.visit_CLOB(type_, **kw)
def visit_unicode_text(self, type_):
def visit_unicode_text(self, type_, **kw):
if self.dialect._supports_nchar:
return self.visit_NCLOB(type_)
return self.visit_NCLOB(type_, **kw)
else:
return self.visit_CLOB(type_)
return self.visit_CLOB(type_, **kw)
def visit_large_binary(self, type_):
return self.visit_BLOB(type_)
def visit_large_binary(self, type_, **kw):
return self.visit_BLOB(type_, **kw)
def visit_big_integer(self, type_):
return self.visit_NUMBER(type_, precision=19)
def visit_big_integer(self, type_, **kw):
return self.visit_NUMBER(type_, precision=19, **kw)
def visit_boolean(self, type_):
return self.visit_SMALLINT(type_)
def visit_boolean(self, type_, **kw):
return self.visit_SMALLINT(type_, **kw)
def visit_RAW(self, type_):
def visit_RAW(self, type_, **kw):
if type_.length:
return "RAW(%(length)s)" % {'length': type_.length}
else:
return "RAW"
def visit_ROWID(self, type_):
def visit_ROWID(self, type_, **kw):
return "ROWID"
class OracleCompiler(compiler.SQLCompiler):
"""Oracle compiler modifies the lexical structure of Select
statements to work under non-ANSI configured Oracle databases, if
the use_ansi flag is False.
@ -538,6 +600,9 @@ class OracleCompiler(compiler.SQLCompiler):
def visit_false(self, expr, **kw):
return '0'
def get_cte_preamble(self, recursive):
return "WITH"
def get_select_hint_text(self, byfroms):
return " ".join(
"/*+ %s */" % text for table, text in byfroms.items()
@ -601,29 +666,17 @@ class OracleCompiler(compiler.SQLCompiler):
else:
return sql.and_(*clauses)
def visit_outer_join_column(self, vc):
return self.process(vc.column) + "(+)"
def visit_outer_join_column(self, vc, **kw):
return self.process(vc.column, **kw) + "(+)"
def visit_sequence(self, seq):
return (self.dialect.identifier_preparer.format_sequence(seq) +
".nextval")
def visit_alias(self, alias, asfrom=False, ashint=False, **kwargs):
"""Oracle doesn't like ``FROM table AS alias``. Is the AS standard
SQL??
"""
def get_render_as_alias_suffix(self, alias_name_text):
"""Oracle doesn't like ``FROM table AS alias``"""
if asfrom or ashint:
alias_name = isinstance(alias.name, expression._truncated_label) and \
self._truncated_identifier("alias", alias.name) or alias.name
if ashint:
return alias_name
elif asfrom:
return self.process(alias.original, asfrom=asfrom, **kwargs) + \
" " + self.preparer.format_alias(alias, alias_name)
else:
return self.process(alias.original, **kwargs)
return " " + alias_name_text
def returning_clause(self, stmt, returning_cols):
columns = []
@ -640,8 +693,9 @@ class OracleCompiler(compiler.SQLCompiler):
self.bindparam_string(self._truncate_bindparam(outparam)))
columns.append(
self.process(col_expr, within_columns_clause=False))
self.result_map[outparam.key] = (
outparam.key,
self._add_to_result_map(
outparam.key, outparam.key,
(column, getattr(column, 'name', None),
getattr(column, 'key', None)),
column.type
@ -669,9 +723,11 @@ class OracleCompiler(compiler.SQLCompiler):
select = select.where(whereclause)
select._oracle_visit = True
if select._limit is not None or select._offset is not None:
limit_clause = select._limit_clause
offset_clause = select._offset_clause
if limit_clause is not None or offset_clause is not None:
# See http://www.oracle.com/technology/oramag/oracle/06-sep/\
# o56asktom.html
# o56asktom.html
#
# Generalized form of an Oracle pagination query:
# select ... from (
@ -682,13 +738,15 @@ class OracleCompiler(compiler.SQLCompiler):
# Outer select and "ROWNUM as ora_rn" can be dropped if
# limit=0
# TODO: use annotations instead of clone + attr set ?
kwargs['select_wraps_for'] = select
select = select._generate()
select._oracle_visit = True
# Wrap the middle select and add the hint
limitselect = sql.select([c for c in select.c])
if select._limit and self.dialect.optimize_limits:
if limit_clause is not None and \
self.dialect.optimize_limits and \
select._simple_int_limit:
limitselect = limitselect.prefix_with(
"/*+ FIRST_ROWS(%d) */" %
select._limit)
@ -697,17 +755,24 @@ class OracleCompiler(compiler.SQLCompiler):
limitselect._is_wrapper = True
# If needed, add the limiting clause
if select._limit is not None:
max_row = select._limit
if select._offset is not None:
max_row += select._offset
if limit_clause is not None:
if not self.dialect.use_binds_for_limits:
# use simple int limits, will raise an exception
# if the limit isn't specified this way
max_row = select._limit
if offset_clause is not None:
max_row += select._offset
max_row = sql.literal_column("%d" % max_row)
else:
max_row = limit_clause
if offset_clause is not None:
max_row = max_row + offset_clause
limitselect.append_whereclause(
sql.literal_column("ROWNUM") <= max_row)
# If needed, add the ora_rn, and wrap again with offset.
if select._offset is None:
if offset_clause is None:
limitselect._for_update_arg = select._for_update_arg
select = limitselect
else:
@ -721,22 +786,21 @@ class OracleCompiler(compiler.SQLCompiler):
offsetselect._oracle_visit = True
offsetselect._is_wrapper = True
offset_value = select._offset
if not self.dialect.use_binds_for_limits:
offset_value = sql.literal_column("%d" % offset_value)
offset_clause = sql.literal_column(
"%d" % select._offset)
offsetselect.append_whereclause(
sql.literal_column("ora_rn") > offset_value)
sql.literal_column("ora_rn") > offset_clause)
offsetselect._for_update_arg = select._for_update_arg
select = offsetselect
kwargs['iswrapper'] = getattr(select, '_is_wrapper', False)
return compiler.SQLCompiler.visit_select(self, select, **kwargs)
def limit_clause(self, select):
def limit_clause(self, select, **kw):
return ""
def for_update_clause(self, select):
def for_update_clause(self, select, **kw):
if self.is_subquery():
return ""
@ -744,7 +808,7 @@ class OracleCompiler(compiler.SQLCompiler):
if select._for_update_arg.of:
tmp += ' OF ' + ', '.join(
self.process(elem) for elem in
self.process(elem, **kw) for elem in
select._for_update_arg.of
)
@ -773,15 +837,57 @@ class OracleDDLCompiler(compiler.DDLCompiler):
return text
def visit_create_index(self, create, **kw):
return super(OracleDDLCompiler, self).\
visit_create_index(create, include_schema=True)
def visit_create_index(self, create):
index = create.element
self._verify_index_table(index)
preparer = self.preparer
text = "CREATE "
if index.unique:
text += "UNIQUE "
if index.dialect_options['oracle']['bitmap']:
text += "BITMAP "
text += "INDEX %s ON %s (%s)" % (
self._prepared_index_name(index, include_schema=True),
preparer.format_table(index.table, use_schema=True),
', '.join(
self.sql_compiler.process(
expr,
include_table=False, literal_binds=True)
for expr in index.expressions)
)
if index.dialect_options['oracle']['compress'] is not False:
if index.dialect_options['oracle']['compress'] is True:
text += " COMPRESS"
else:
text += " COMPRESS %d" % (
index.dialect_options['oracle']['compress']
)
return text
def post_create_table(self, table):
table_opts = []
opts = table.dialect_options['oracle']
if opts['on_commit']:
on_commit_options = opts['on_commit'].replace("_", " ").upper()
table_opts.append('\n ON COMMIT %s' % on_commit_options)
if opts['compress']:
if opts['compress'] is True:
table_opts.append("\n COMPRESS")
else:
table_opts.append("\n COMPRESS FOR %s" % (
opts['compress']
))
return ''.join(table_opts)
class OracleIdentifierPreparer(compiler.IdentifierPreparer):
reserved_words = set([x.lower() for x in RESERVED_WORDS])
illegal_initial_characters = set(range(0, 10)).union(["_", "$"])
illegal_initial_characters = set(
(str(dig) for dig in range(0, 10))).union(["_", "$"])
def _bindparam_requires_quotes(self, value):
"""Return True if the given identifier requires quoting."""
@ -798,7 +904,6 @@ class OracleIdentifierPreparer(compiler.IdentifierPreparer):
class OracleExecutionContext(default.DefaultExecutionContext):
def fire_sequence(self, seq, type_):
return self._execute_scalar(
"SELECT " +
@ -815,6 +920,8 @@ class OracleDialect(default.DefaultDialect):
supports_sane_rowcount = True
supports_sane_multi_rowcount = False
supports_simple_order_by_label = False
supports_sequences = True
sequences_optional = False
postfetch_lastrowid = False
@ -836,7 +943,15 @@ class OracleDialect(default.DefaultDialect):
reflection_options = ('oracle_resolve_synonyms', )
construct_arguments = [
(sa_schema.Table, {"resolve_synonyms": False})
(sa_schema.Table, {
"resolve_synonyms": False,
"on_commit": None,
"compress": False
}),
(sa_schema.Index, {
"bitmap": False,
"compress": False
})
]
def __init__(self,
@ -866,6 +981,16 @@ class OracleDialect(default.DefaultDialect):
return self.server_version_info and \
self.server_version_info < (9, )
@property
def _supports_table_compression(self):
return self.server_version_info and \
self.server_version_info >= (9, 2, )
@property
def _supports_table_compress_for(self):
return self.server_version_info and \
self.server_version_info >= (11, )
@property
def _supports_char_length(self):
return not self._is_oracle_8
@ -908,6 +1033,8 @@ class OracleDialect(default.DefaultDialect):
if name.upper() == name and not \
self.identifier_preparer._requires_quotes(name.lower()):
return name.lower()
elif name.lower() == name:
return quoted_name(name, quote=True)
else:
return name
@ -1023,7 +1150,21 @@ class OracleDialect(default.DefaultDialect):
"WHERE nvl(tablespace_name, 'no tablespace') NOT IN "
"('SYSTEM', 'SYSAUX') "
"AND OWNER = :owner "
"AND IOT_NAME IS NULL")
"AND IOT_NAME IS NULL "
"AND DURATION IS NULL")
cursor = connection.execute(s, owner=schema)
return [self.normalize_name(row[0]) for row in cursor]
@reflection.cache
def get_temp_table_names(self, connection, **kw):
schema = self.denormalize_name(self.default_schema_name)
s = sql.text(
"SELECT table_name FROM all_tables "
"WHERE nvl(tablespace_name, 'no tablespace') NOT IN "
"('SYSTEM', 'SYSAUX') "
"AND OWNER = :owner "
"AND IOT_NAME IS NULL "
"AND DURATION IS NOT NULL")
cursor = connection.execute(s, owner=schema)
return [self.normalize_name(row[0]) for row in cursor]
@ -1034,6 +1175,50 @@ class OracleDialect(default.DefaultDialect):
cursor = connection.execute(s, owner=self.denormalize_name(schema))
return [self.normalize_name(row[0]) for row in cursor]
@reflection.cache
def get_table_options(self, connection, table_name, schema=None, **kw):
options = {}
resolve_synonyms = kw.get('oracle_resolve_synonyms', False)
dblink = kw.get('dblink', '')
info_cache = kw.get('info_cache')
(table_name, schema, dblink, synonym) = \
self._prepare_reflection_args(connection, table_name, schema,
resolve_synonyms, dblink,
info_cache=info_cache)
params = {"table_name": table_name}
columns = ["table_name"]
if self._supports_table_compression:
columns.append("compression")
if self._supports_table_compress_for:
columns.append("compress_for")
text = "SELECT %(columns)s "\
"FROM ALL_TABLES%(dblink)s "\
"WHERE table_name = :table_name"
if schema is not None:
params['owner'] = schema
text += " AND owner = :owner "
text = text % {'dblink': dblink, 'columns': ", ".join(columns)}
result = connection.execute(sql.text(text), **params)
enabled = dict(DISABLED=False, ENABLED=True)
row = result.first()
if row:
if "compression" in row and enabled.get(row.compression, False):
if "compress_for" in row:
options['oracle_compress'] = row.compress_for
else:
options['oracle_compress'] = True
return options
@reflection.cache
def get_columns(self, connection, table_name, schema=None, **kw):
"""
@ -1119,7 +1304,8 @@ class OracleDialect(default.DefaultDialect):
params = {'table_name': table_name}
text = \
"SELECT a.index_name, a.column_name, b.uniqueness "\
"SELECT a.index_name, a.column_name, "\
"\nb.index_type, b.uniqueness, b.compression, b.prefix_length "\
"\nFROM ALL_IND_COLUMNS%(dblink)s a, "\
"\nALL_INDEXES%(dblink)s b "\
"\nWHERE "\
@ -1145,6 +1331,7 @@ class OracleDialect(default.DefaultDialect):
dblink=dblink, info_cache=kw.get('info_cache'))
pkeys = pk_constraint['constrained_columns']
uniqueness = dict(NONUNIQUE=False, UNIQUE=True)
enabled = dict(DISABLED=False, ENABLED=True)
oracle_sys_col = re.compile(r'SYS_NC\d+\$', re.IGNORECASE)
@ -1164,10 +1351,15 @@ class OracleDialect(default.DefaultDialect):
if rset.index_name != last_index_name:
remove_if_primary_key(index)
index = dict(name=self.normalize_name(rset.index_name),
column_names=[])
column_names=[], dialect_options={})
indexes.append(index)
index['unique'] = uniqueness.get(rset.uniqueness, False)
if rset.index_type in ('BITMAP', 'FUNCTION-BASED BITMAP'):
index['dialect_options']['oracle_bitmap'] = True
if enabled.get(rset.compression, False):
index['dialect_options']['oracle_compress'] = rset.prefix_length
# filter out Oracle SYS_NC names. could also do an outer join
# to the all_tab_columns table and check for real col names there.
if not oracle_sys_col.match(rset.column_name):

33
lib/python3.5/site-packages/sqlalchemy/dialects/oracle/cx_oracle.py
View file

@ -1,5 +1,5 @@
# oracle/cx_oracle.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -61,6 +61,14 @@ on the URL, or as keyword arguments to :func:`.create_engine()` are:
Defaults to ``True``. Note that this is the opposite default of the
cx_Oracle DBAPI itself.
* ``service_name`` - An option to use connection string (DSN) with
``SERVICE_NAME`` instead of ``SID``. It can't be passed when a ``database``
part is given.
E.g. ``oracle+cx_oracle://scott:tiger@host:1521/?service_name=hr``
is a valid url. This value is only available as a URL query string argument.
.. versionadded:: 1.0.0
.. _cx_oracle_unicode:
Unicode
@ -285,6 +293,7 @@ from .base import OracleCompiler, OracleDialect, OracleExecutionContext
from . import base as oracle
from ...engine import result as _result
from sqlalchemy import types as sqltypes, util, exc, processors
from sqlalchemy import util
import random
import collections
import decimal
@ -711,8 +720,10 @@ class OracleDialect_cx_oracle(OracleDialect):
# this occurs in tests with mock DBAPIs
self._cx_oracle_string_types = set()
self._cx_oracle_with_unicode = False
elif self.cx_oracle_ver >= (5,) and not \
hasattr(self.dbapi, 'UNICODE'):
elif util.py3k or (
self.cx_oracle_ver >= (5,) and not \
hasattr(self.dbapi, 'UNICODE')
):
# cx_Oracle WITH_UNICODE mode. *only* python
# unicode objects accepted for anything
self.supports_unicode_statements = True
@ -862,14 +873,26 @@ class OracleDialect_cx_oracle(OracleDialect):
util.coerce_kw_type(dialect_opts, opt, bool)
setattr(self, opt, dialect_opts[opt])
if url.database:
database = url.database
service_name = dialect_opts.get('service_name', None)
if database or service_name:
# if we have a database, then we have a remote host
port = url.port
if port:
port = int(port)
else:
port = 1521
dsn = self.dbapi.makedsn(url.host, port, url.database)
if database and service_name:
raise exc.InvalidRequestError(
'"service_name" option shouldn\'t '
'be used with a "database" part of the url')
if database:
makedsn_kwargs = {'sid': database}
if service_name:
makedsn_kwargs = {'service_name': service_name}
dsn = self.dbapi.makedsn(url.host, port, **makedsn_kwargs)
else:
# we have a local tnsname
dsn = url.host

11
lib/python3.5/site-packages/sqlalchemy/dialects/oracle/zxjdbc.py
View file

@ -1,5 +1,5 @@
# oracle/zxjdbc.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -10,8 +10,10 @@
:name: zxJDBC for Jython
:dbapi: zxjdbc
:connectstring: oracle+zxjdbc://user:pass@host/dbname
:driverurl: http://www.oracle.com/technology/software/tech/java/\
sqlj_jdbc/index.html.
:driverurl: http://www.oracle.com/technetwork/database/features/jdbc/index-091264.html
.. note:: Jython is not supported by current versions of SQLAlchemy. The
zxjdbc dialect should be considered as experimental.
"""
import decimal
@ -68,8 +70,7 @@ class OracleCompiler_zxjdbc(OracleCompiler):
expression._select_iterables(returning_cols))
# within_columns_clause=False so that labels (foo AS bar) don't render
columns = [self.process(c, within_columns_clause=False,
result_map=self.result_map)
columns = [self.process(c, within_columns_clause=False)
for c in self.returning_cols]
if not hasattr(self, 'returning_parameters'):

2
lib/python3.5/site-packages/sqlalchemy/dialects/postgres.py
View file

@ -1,5 +1,5 @@
# dialects/postgres.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under

9
lib/python3.5/site-packages/sqlalchemy/dialects/postgresql/__init__.py
View file

@ -1,11 +1,11 @@
# postgresql/__init__.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
from . import base, psycopg2, pg8000, pypostgresql, zxjdbc
from . import base, psycopg2, pg8000, pypostgresql, zxjdbc, psycopg2cffi
base.dialect = psycopg2.dialect
@ -13,7 +13,7 @@ from .base import \
INTEGER, BIGINT, SMALLINT, VARCHAR, CHAR, TEXT, NUMERIC, FLOAT, REAL, \
INET, CIDR, UUID, BIT, MACADDR, OID, DOUBLE_PRECISION, TIMESTAMP, TIME, \
DATE, BYTEA, BOOLEAN, INTERVAL, ARRAY, ENUM, dialect, array, Any, All, \
TSVECTOR
TSVECTOR, DropEnumType
from .constraints import ExcludeConstraint
from .hstore import HSTORE, hstore
from .json import JSON, JSONElement, JSONB
@ -26,5 +26,6 @@ __all__ = (
'DOUBLE_PRECISION', 'TIMESTAMP', 'TIME', 'DATE', 'BYTEA', 'BOOLEAN',
'INTERVAL', 'ARRAY', 'ENUM', 'dialect', 'Any', 'All', 'array', 'HSTORE',
'hstore', 'INT4RANGE', 'INT8RANGE', 'NUMRANGE', 'DATERANGE',
'TSRANGE', 'TSTZRANGE', 'json', 'JSON', 'JSONB', 'JSONElement'
'TSRANGE', 'TSTZRANGE', 'json', 'JSON', 'JSONB', 'JSONElement',
'DropEnumType'
)

709
lib/python3.5/site-packages/sqlalchemy/dialects/postgresql/base.py
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File diff suppressed because it is too large Load diff

41
lib/python3.5/site-packages/sqlalchemy/dialects/postgresql/constraints.py
View file

@ -1,10 +1,11 @@
# Copyright (C) 2013-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2013-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
from sqlalchemy.schema import ColumnCollectionConstraint
from sqlalchemy.sql import expression
from ...sql.schema import ColumnCollectionConstraint
from ...sql import expression
from ... import util
class ExcludeConstraint(ColumnCollectionConstraint):
@ -48,20 +49,42 @@ static/sql-createtable.html#SQL-CREATETABLE-EXCLUDE
for this constraint.
"""
columns = []
render_exprs = []
self.operators = {}
expressions, operators = zip(*elements)
for (expr, column, strname, add_element), operator in zip(
self._extract_col_expression_collection(expressions),
operators
):
if add_element is not None:
columns.append(add_element)
name = column.name if column is not None else strname
if name is not None:
# backwards compat
self.operators[name] = operator
expr = expression._literal_as_text(expr)
render_exprs.append(
(expr, name, operator)
)
self._render_exprs = render_exprs
ColumnCollectionConstraint.__init__(
self,
*[col for col, op in elements],
*columns,
name=kw.get('name'),
deferrable=kw.get('deferrable'),
initially=kw.get('initially')
)
self.operators = {}
for col_or_string, op in elements:
name = getattr(col_or_string, 'name', col_or_string)
self.operators[name] = op
self.using = kw.get('using', 'gist')
where = kw.get('where')
if where:
if where is not None:
self.where = expression._literal_as_text(where)
def copy(self, **kw):

2
lib/python3.5/site-packages/sqlalchemy/dialects/postgresql/hstore.py
View file

@ -1,5 +1,5 @@
# postgresql/hstore.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under

38
lib/python3.5/site-packages/sqlalchemy/dialects/postgresql/json.py
View file

@ -1,5 +1,5 @@
# postgresql/json.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -12,7 +12,7 @@ from .base import ischema_names
from ... import types as sqltypes
from ...sql.operators import custom_op
from ... import sql
from ...sql import elements
from ...sql import elements, default_comparator
from ... import util
__all__ = ('JSON', 'JSONElement', 'JSONB')
@ -46,7 +46,8 @@ class JSONElement(elements.BinaryExpression):
self._json_opstring = opstring
operator = custom_op(opstring, precedence=5)
right = left._check_literal(left, operator, right)
right = default_comparator._check_literal(
left, operator, right)
super(JSONElement, self).__init__(
left, right, operator, type_=result_type)
@ -77,7 +78,7 @@ class JSONElement(elements.BinaryExpression):
def cast(self, type_):
"""Convert this :class:`.JSONElement` to apply both the 'astext' operator
as well as an explicit type cast when evaulated.
as well as an explicit type cast when evaluated.
E.g.::
@ -164,6 +165,23 @@ class JSON(sqltypes.TypeEngine):
__visit_name__ = 'JSON'
def __init__(self, none_as_null=False):
"""Construct a :class:`.JSON` type.
:param none_as_null: if True, persist the value ``None`` as a
SQL NULL value, not the JSON encoding of ``null``. Note that
when this flag is False, the :func:`.null` construct can still
be used to persist a NULL value::
from sqlalchemy import null
conn.execute(table.insert(), data=null())
.. versionchanged:: 0.9.8 - Added ``none_as_null``, and :func:`.null`
is now supported in order to persist a NULL value.
"""
self.none_as_null = none_as_null
class comparator_factory(sqltypes.Concatenable.Comparator):
"""Define comparison operations for :class:`.JSON`."""
@ -185,9 +203,17 @@ class JSON(sqltypes.TypeEngine):
encoding = dialect.encoding
def process(value):
if isinstance(value, elements.Null) or (
value is None and self.none_as_null
):
return None
return json_serializer(value).encode(encoding)
else:
def process(value):
if isinstance(value, elements.Null) or (
value is None and self.none_as_null
):
return None
return json_serializer(value)
return process
@ -197,9 +223,13 @@ class JSON(sqltypes.TypeEngine):
encoding = dialect.encoding
def process(value):
if value is None:
return None
return json_deserializer(value.decode(encoding))
else:
def process(value):
if value is None:
return None
return json_deserializer(value)
return process

110
lib/python3.5/site-packages/sqlalchemy/dialects/postgresql/pg8000.py
View file

@ -1,5 +1,5 @@
# postgresql/pg8000.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors <see AUTHORS
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors <see AUTHORS
# file>
#
# This module is part of SQLAlchemy and is released under
@ -13,17 +13,30 @@
postgresql+pg8000://user:password@host:port/dbname[?key=value&key=value...]
:url: https://pythonhosted.org/pg8000/
.. _pg8000_unicode:
Unicode
-------
When communicating with the server, pg8000 **always uses the server-side
character set**. SQLAlchemy has no ability to modify what character set
pg8000 chooses to use, and additionally SQLAlchemy does no unicode conversion
of any kind with the pg8000 backend. The origin of the client encoding setting
is ultimately the CLIENT_ENCODING setting in postgresql.conf.
pg8000 will encode / decode string values between it and the server using the
PostgreSQL ``client_encoding`` parameter; by default this is the value in
the ``postgresql.conf`` file, which often defaults to ``SQL_ASCII``.
Typically, this can be changed to ``utf-8``, as a more useful default::
It is not necessary, though is also harmless, to pass the "encoding" parameter
to :func:`.create_engine` when using pg8000.
#client_encoding = sql_ascii # actually, defaults to database
# encoding
client_encoding = utf8
The ``client_encoding`` can be overriden for a session by executing the SQL:
SET CLIENT_ENCODING TO 'utf8';
SQLAlchemy will execute this SQL on all new connections based on the value
passed to :func:`.create_engine` using the ``client_encoding`` parameter::
engine = create_engine(
"postgresql+pg8000://user:pass@host/dbname", client_encoding='utf8')
.. _pg8000_isolation_level:
@ -58,6 +71,8 @@ from ... import types as sqltypes
from .base import (
PGDialect, PGCompiler, PGIdentifierPreparer, PGExecutionContext,
_DECIMAL_TYPES, _FLOAT_TYPES, _INT_TYPES)
import re
from sqlalchemy.dialects.postgresql.json import JSON
class _PGNumeric(sqltypes.Numeric):
@ -88,6 +103,15 @@ class _PGNumericNoBind(_PGNumeric):
return None
class _PGJSON(JSON):
def result_processor(self, dialect, coltype):
if dialect._dbapi_version > (1, 10, 1):
return None # Has native JSON
else:
return super(_PGJSON, self).result_processor(dialect, coltype)
class PGExecutionContext_pg8000(PGExecutionContext):
pass
@ -119,7 +143,7 @@ class PGDialect_pg8000(PGDialect):
supports_unicode_binds = True
default_paramstyle = 'format'
supports_sane_multi_rowcount = False
supports_sane_multi_rowcount = True
execution_ctx_cls = PGExecutionContext_pg8000
statement_compiler = PGCompiler_pg8000
preparer = PGIdentifierPreparer_pg8000
@ -129,10 +153,29 @@ class PGDialect_pg8000(PGDialect):
PGDialect.colspecs,
{
sqltypes.Numeric: _PGNumericNoBind,
sqltypes.Float: _PGNumeric
sqltypes.Float: _PGNumeric,
JSON: _PGJSON,
}
)
def __init__(self, client_encoding=None, **kwargs):
PGDialect.__init__(self, **kwargs)
self.client_encoding = client_encoding
def initialize(self, connection):
self.supports_sane_multi_rowcount = self._dbapi_version >= (1, 9, 14)
super(PGDialect_pg8000, self).initialize(connection)
@util.memoized_property
def _dbapi_version(self):
if self.dbapi and hasattr(self.dbapi, '__version__'):
return tuple(
[
int(x) for x in re.findall(
r'(\d+)(?:[-\.]?|$)', self.dbapi.__version__)])
else:
return (99, 99, 99)
@classmethod
def dbapi(cls):
return __import__('pg8000')
@ -171,4 +214,51 @@ class PGDialect_pg8000(PGDialect):
(level, self.name, ", ".join(self._isolation_lookup))
)
def set_client_encoding(self, connection, client_encoding):
# adjust for ConnectionFairy possibly being present
if hasattr(connection, 'connection'):
connection = connection.connection
cursor = connection.cursor()
cursor.execute("SET CLIENT_ENCODING TO '" + client_encoding + "'")
cursor.execute("COMMIT")
cursor.close()
def do_begin_twophase(self, connection, xid):
connection.connection.tpc_begin((0, xid, ''))
def do_prepare_twophase(self, connection, xid):
connection.connection.tpc_prepare()
def do_rollback_twophase(
self, connection, xid, is_prepared=True, recover=False):
connection.connection.tpc_rollback((0, xid, ''))
def do_commit_twophase(
self, connection, xid, is_prepared=True, recover=False):
connection.connection.tpc_commit((0, xid, ''))
def do_recover_twophase(self, connection):
return [row[1] for row in connection.connection.tpc_recover()]
def on_connect(self):
fns = []
if self.client_encoding is not None:
def on_connect(conn):
self.set_client_encoding(conn, self.client_encoding)
fns.append(on_connect)
if self.isolation_level is not None:
def on_connect(conn):
self.set_isolation_level(conn, self.isolation_level)
fns.append(on_connect)
if len(fns) > 0:
def on_connect(conn):
for fn in fns:
fn(conn)
return on_connect
else:
return None
dialect = PGDialect_pg8000

273
lib/python3.5/site-packages/sqlalchemy/dialects/postgresql/psycopg2.py
View file

@ -1,5 +1,5 @@
# postgresql/psycopg2.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -32,10 +32,25 @@ psycopg2-specific keyword arguments which are accepted by
way of enabling this mode on a per-execution basis.
* ``use_native_unicode``: Enable the usage of Psycopg2 "native unicode" mode
per connection. True by default.
.. seealso::
:ref:`psycopg2_disable_native_unicode`
* ``isolation_level``: This option, available for all PostgreSQL dialects,
includes the ``AUTOCOMMIT`` isolation level when using the psycopg2
dialect. See :ref:`psycopg2_isolation_level`.
dialect.
.. seealso::
:ref:`psycopg2_isolation_level`
* ``client_encoding``: sets the client encoding in a libpq-agnostic way,
using psycopg2's ``set_client_encoding()`` method.
.. seealso::
:ref:`psycopg2_unicode`
Unix Domain Connections
------------------------
@ -51,12 +66,15 @@ in ``/tmp``, or whatever socket directory was specified when PostgreSQL
was built. This value can be overridden by passing a pathname to psycopg2,
using ``host`` as an additional keyword argument::
create_engine("postgresql+psycopg2://user:password@/dbname?host=/var/lib/postgresql")
create_engine("postgresql+psycopg2://user:password@/dbname?\
host=/var/lib/postgresql")
See also:
`PQconnectdbParams <http://www.postgresql.org/docs/9.1/static\
/libpq-connect.html#LIBPQ-PQCONNECTDBPARAMS>`_
`PQconnectdbParams <http://www.postgresql.org/docs/9.1/static/\
libpq-connect.html#LIBPQ-PQCONNECTDBPARAMS>`_
.. _psycopg2_execution_options:
Per-Statement/Connection Execution Options
-------------------------------------------
@ -65,18 +83,27 @@ The following DBAPI-specific options are respected when used with
:meth:`.Connection.execution_options`, :meth:`.Executable.execution_options`,
:meth:`.Query.execution_options`, in addition to those not specific to DBAPIs:
* isolation_level - Set the transaction isolation level for the lifespan of a
* ``isolation_level`` - Set the transaction isolation level for the lifespan of a
:class:`.Connection` (can only be set on a connection, not a statement
or query). See :ref:`psycopg2_isolation_level`.
* stream_results - Enable or disable usage of psycopg2 server side cursors -
* ``stream_results`` - Enable or disable usage of psycopg2 server side cursors -
this feature makes use of "named" cursors in combination with special
result handling methods so that result rows are not fully buffered.
If ``None`` or not set, the ``server_side_cursors`` option of the
:class:`.Engine` is used.
Unicode
-------
* ``max_row_buffer`` - when using ``stream_results``, an integer value that
specifies the maximum number of rows to buffer at a time. This is
interpreted by the :class:`.BufferedRowResultProxy`, and if omitted the
buffer will grow to ultimately store 1000 rows at a time.
.. versionadded:: 1.0.6
.. _psycopg2_unicode:
Unicode with Psycopg2
----------------------
By default, the psycopg2 driver uses the ``psycopg2.extensions.UNICODE``
extension, such that the DBAPI receives and returns all strings as Python
@ -84,27 +111,51 @@ Unicode objects directly - SQLAlchemy passes these values through without
change. Psycopg2 here will encode/decode string values based on the
current "client encoding" setting; by default this is the value in
the ``postgresql.conf`` file, which often defaults to ``SQL_ASCII``.
Typically, this can be changed to ``utf-8``, as a more useful default::
Typically, this can be changed to ``utf8``, as a more useful default::
#client_encoding = sql_ascii # actually, defaults to database
# postgresql.conf file
# client_encoding = sql_ascii # actually, defaults to database
# encoding
client_encoding = utf8
A second way to affect the client encoding is to set it within Psycopg2
locally. SQLAlchemy will call psycopg2's ``set_client_encoding()``
method (see:
http://initd.org/psycopg/docs/connection.html#connection.set_client_encoding)
locally. SQLAlchemy will call psycopg2's
:meth:`psycopg2:connection.set_client_encoding` method
on all new connections based on the value passed to
:func:`.create_engine` using the ``client_encoding`` parameter::
# set_client_encoding() setting;
# works for *all* Postgresql versions
engine = create_engine("postgresql://user:pass@host/dbname",
client_encoding='utf8')
This overrides the encoding specified in the Postgresql client configuration.
When using the parameter in this way, the psycopg2 driver emits
``SET client_encoding TO 'utf8'`` on the connection explicitly, and works
in all Postgresql versions.
.. versionadded:: 0.7.3
The psycopg2-specific ``client_encoding`` parameter to
:func:`.create_engine`.
Note that the ``client_encoding`` setting as passed to :func:`.create_engine`
is **not the same** as the more recently added ``client_encoding`` parameter
now supported by libpq directly. This is enabled when ``client_encoding``
is passed directly to ``psycopg2.connect()``, and from SQLAlchemy is passed
using the :paramref:`.create_engine.connect_args` parameter::
# libpq direct parameter setting;
# only works for Postgresql **9.1 and above**
engine = create_engine("postgresql://user:pass@host/dbname",
connect_args={'client_encoding': 'utf8'})
# using the query string is equivalent
engine = create_engine("postgresql://user:pass@host/dbname?client_encoding=utf8")
The above parameter was only added to libpq as of version 9.1 of Postgresql,
so using the previous method is better for cross-version support.
.. _psycopg2_disable_native_unicode:
Disabling Native Unicode
^^^^^^^^^^^^^^^^^^^^^^^^
SQLAlchemy can also be instructed to skip the usage of the psycopg2
``UNICODE`` extension and to instead utilize its own unicode encode/decode
@ -116,8 +167,56 @@ in and coerce from bytes on the way back,
using the value of the :func:`.create_engine` ``encoding`` parameter, which
defaults to ``utf-8``.
SQLAlchemy's own unicode encode/decode functionality is steadily becoming
obsolete as more DBAPIs support unicode fully along with the approach of
Python 3; in modern usage psycopg2 should be relied upon to handle unicode.
obsolete as most DBAPIs now support unicode fully.
Bound Parameter Styles
----------------------
The default parameter style for the psycopg2 dialect is "pyformat", where
SQL is rendered using ``%(paramname)s`` style. This format has the limitation
that it does not accommodate the unusual case of parameter names that
actually contain percent or parenthesis symbols; as SQLAlchemy in many cases
generates bound parameter names based on the name of a column, the presence
of these characters in a column name can lead to problems.
There are two solutions to the issue of a :class:`.schema.Column` that contains
one of these characters in its name. One is to specify the
:paramref:`.schema.Column.key` for columns that have such names::
measurement = Table('measurement', metadata,
Column('Size (meters)', Integer, key='size_meters')
)
Above, an INSERT statement such as ``measurement.insert()`` will use
``size_meters`` as the parameter name, and a SQL expression such as
``measurement.c.size_meters > 10`` will derive the bound parameter name
from the ``size_meters`` key as well.
.. versionchanged:: 1.0.0 - SQL expressions will use :attr:`.Column.key`
as the source of naming when anonymous bound parameters are created
in SQL expressions; previously, this behavior only applied to
:meth:`.Table.insert` and :meth:`.Table.update` parameter names.
The other solution is to use a positional format; psycopg2 allows use of the
"format" paramstyle, which can be passed to
:paramref:`.create_engine.paramstyle`::
engine = create_engine(
'postgresql://scott:tiger@localhost:5432/test', paramstyle='format')
With the above engine, instead of a statement like::
INSERT INTO measurement ("Size (meters)") VALUES (%(Size (meters))s)
{'Size (meters)': 1}
we instead see::
INSERT INTO measurement ("Size (meters)") VALUES (%s)
(1, )
Where above, the dictionary style is converted into a tuple with positional
style.
Transactions
------------
@ -148,7 +247,7 @@ The psycopg2 dialect supports these constants for isolation level:
* ``AUTOCOMMIT``
.. versionadded:: 0.8.2 support for AUTOCOMMIT isolation level when using
psycopg2.
psycopg2.
.. seealso::
@ -173,14 +272,17 @@ HSTORE type
The ``psycopg2`` DBAPI includes an extension to natively handle marshalling of
the HSTORE type. The SQLAlchemy psycopg2 dialect will enable this extension
by default when it is detected that the target database has the HSTORE
type set up for use. In other words, when the dialect makes the first
by default when psycopg2 version 2.4 or greater is used, and
it is detected that the target database has the HSTORE type set up for use.
In other words, when the dialect makes the first
connection, a sequence like the following is performed:
1. Request the available HSTORE oids using
``psycopg2.extras.HstoreAdapter.get_oids()``.
If this function returns a list of HSTORE identifiers, we then determine
that the ``HSTORE`` extension is present.
This function is **skipped** if the version of psycopg2 installed is
less than version 2.4.
2. If the ``use_native_hstore`` flag is at its default of ``True``, and
we've detected that ``HSTORE`` oids are available, the
@ -219,9 +321,14 @@ from ... import types as sqltypes
from .base import PGDialect, PGCompiler, \
PGIdentifierPreparer, PGExecutionContext, \
ENUM, ARRAY, _DECIMAL_TYPES, _FLOAT_TYPES,\
_INT_TYPES
_INT_TYPES, UUID
from .hstore import HSTORE
from .json import JSON
from .json import JSON, JSONB
try:
from uuid import UUID as _python_UUID
except ImportError:
_python_UUID = None
logger = logging.getLogger('sqlalchemy.dialects.postgresql')
@ -256,7 +363,7 @@ class _PGNumeric(sqltypes.Numeric):
class _PGEnum(ENUM):
def result_processor(self, dialect, coltype):
if util.py2k and self.convert_unicode is True:
if self.native_enum and util.py2k and self.convert_unicode is True:
# we can't easily use PG's extensions here because
# the OID is on the fly, and we need to give it a python
# function anyway - not really worth it.
@ -286,6 +393,35 @@ class _PGJSON(JSON):
else:
return super(_PGJSON, self).result_processor(dialect, coltype)
class _PGJSONB(JSONB):
def result_processor(self, dialect, coltype):
if dialect._has_native_jsonb:
return None
else:
return super(_PGJSONB, self).result_processor(dialect, coltype)
class _PGUUID(UUID):
def bind_processor(self, dialect):
if not self.as_uuid and dialect.use_native_uuid:
nonetype = type(None)
def process(value):
if value is not None:
value = _python_UUID(value)
return value
return process
def result_processor(self, dialect, coltype):
if not self.as_uuid and dialect.use_native_uuid:
def process(value):
if value is not None:
value = str(value)
return value
return process
# When we're handed literal SQL, ensure it's a SELECT query. Since
# 8.3, combining cursors and "FOR UPDATE" has been fine.
SERVER_SIDE_CURSOR_RE = re.compile(
@ -374,8 +510,21 @@ class PGDialect_psycopg2(PGDialect):
preparer = PGIdentifierPreparer_psycopg2
psycopg2_version = (0, 0)
FEATURE_VERSION_MAP = dict(
native_json=(2, 5),
native_jsonb=(2, 5, 4),
sane_multi_rowcount=(2, 0, 9),
array_oid=(2, 4, 3),
hstore_adapter=(2, 4)
)
_has_native_hstore = False
_has_native_json = False
_has_native_jsonb = False
engine_config_types = PGDialect.engine_config_types.union([
('use_native_unicode', util.asbool),
])
colspecs = util.update_copy(
PGDialect.colspecs,
@ -384,18 +533,21 @@ class PGDialect_psycopg2(PGDialect):
ENUM: _PGEnum, # needs force_unicode
sqltypes.Enum: _PGEnum, # needs force_unicode
HSTORE: _PGHStore,
JSON: _PGJSON
JSON: _PGJSON,
JSONB: _PGJSONB,
UUID: _PGUUID
}
)
def __init__(self, server_side_cursors=False, use_native_unicode=True,
client_encoding=None,
use_native_hstore=True,
use_native_hstore=True, use_native_uuid=True,
**kwargs):
PGDialect.__init__(self, **kwargs)
self.server_side_cursors = server_side_cursors
self.use_native_unicode = use_native_unicode
self.use_native_hstore = use_native_hstore
self.use_native_uuid = use_native_uuid
self.supports_unicode_binds = use_native_unicode
self.client_encoding = client_encoding
if self.dbapi and hasattr(self.dbapi, '__version__'):
@ -412,19 +564,34 @@ class PGDialect_psycopg2(PGDialect):
self._has_native_hstore = self.use_native_hstore and \
self._hstore_oids(connection.connection) \
is not None
self._has_native_json = self.psycopg2_version >= (2, 5)
self._has_native_json = \
self.psycopg2_version >= self.FEATURE_VERSION_MAP['native_json']
self._has_native_jsonb = \
self.psycopg2_version >= self.FEATURE_VERSION_MAP['native_jsonb']
# http://initd.org/psycopg/docs/news.html#what-s-new-in-psycopg-2-0-9
self.supports_sane_multi_rowcount = self.psycopg2_version >= (2, 0, 9)
self.supports_sane_multi_rowcount = \
self.psycopg2_version >= \
self.FEATURE_VERSION_MAP['sane_multi_rowcount']
@classmethod
def dbapi(cls):
import psycopg2
return psycopg2
@classmethod
def _psycopg2_extensions(cls):
from psycopg2 import extensions
return extensions
@classmethod
def _psycopg2_extras(cls):
from psycopg2 import extras
return extras
@util.memoized_property
def _isolation_lookup(self):
from psycopg2 import extensions
extensions = self._psycopg2_extensions()
return {
'AUTOCOMMIT': extensions.ISOLATION_LEVEL_AUTOCOMMIT,
'READ COMMITTED': extensions.ISOLATION_LEVEL_READ_COMMITTED,
@ -446,7 +613,8 @@ class PGDialect_psycopg2(PGDialect):
connection.set_isolation_level(level)
def on_connect(self):
from psycopg2 import extras, extensions
extras = self._psycopg2_extras()
extensions = self._psycopg2_extensions()
fns = []
if self.client_encoding is not None:
@ -459,6 +627,11 @@ class PGDialect_psycopg2(PGDialect):
self.set_isolation_level(conn, self.isolation_level)
fns.append(on_connect)
if self.dbapi and self.use_native_uuid:
def on_connect(conn):
extras.register_uuid(None, conn)
fns.append(on_connect)
if self.dbapi and self.use_native_unicode:
def on_connect(conn):
extensions.register_type(extensions.UNICODE, conn)
@ -470,19 +643,23 @@ class PGDialect_psycopg2(PGDialect):
hstore_oids = self._hstore_oids(conn)
if hstore_oids is not None:
oid, array_oid = hstore_oids
kw = {'oid': oid}
if util.py2k:
extras.register_hstore(conn, oid=oid,
array_oid=array_oid,
unicode=True)
else:
extras.register_hstore(conn, oid=oid,
array_oid=array_oid)
kw['unicode'] = True
if self.psycopg2_version >= \
self.FEATURE_VERSION_MAP['array_oid']:
kw['array_oid'] = array_oid
extras.register_hstore(conn, **kw)
fns.append(on_connect)
if self.dbapi and self._json_deserializer:
def on_connect(conn):
extras.register_default_json(
conn, loads=self._json_deserializer)
if self._has_native_json:
extras.register_default_json(
conn, loads=self._json_deserializer)
if self._has_native_jsonb:
extras.register_default_jsonb(
conn, loads=self._json_deserializer)
fns.append(on_connect)
if fns:
@ -495,8 +672,8 @@ class PGDialect_psycopg2(PGDialect):
@util.memoized_instancemethod
def _hstore_oids(self, conn):
if self.psycopg2_version >= (2, 4):
from psycopg2 import extras
if self.psycopg2_version >= self.FEATURE_VERSION_MAP['hstore_adapter']:
extras = self._psycopg2_extras()
oids = extras.HstoreAdapter.get_oids(conn)
if oids is not None and oids[0]:
return oids[0:2]
@ -512,12 +689,14 @@ class PGDialect_psycopg2(PGDialect):
def is_disconnect(self, e, connection, cursor):
if isinstance(e, self.dbapi.Error):
# check the "closed" flag. this might not be
# present on old psycopg2 versions
# present on old psycopg2 versions. Also,
# this flag doesn't actually help in a lot of disconnect
# situations, so don't rely on it.
if getattr(connection, 'closed', False):
return True
# legacy checks based on strings. the "closed" check
# above most likely obviates the need for any of these.
# checks based on strings. in the case that .closed
# didn't cut it, fall back onto these.
str_e = str(e).partition("\n")[0]
for msg in [
# these error messages from libpq: interfaces/libpq/fe-misc.c
@ -534,8 +713,10 @@ class PGDialect_psycopg2(PGDialect):
# not sure where this path is originally from, it may
# be obsolete. It really says "losed", not "closed".
'losed the connection unexpectedly',
# this can occur in newer SSL
'connection has been closed unexpectedly'
# these can occur in newer SSL
'connection has been closed unexpectedly',
'SSL SYSCALL error: Bad file descriptor',
'SSL SYSCALL error: EOF detected',
]:
idx = str_e.find(msg)
if idx >= 0 and '"' not in str_e[:idx]:

61
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@ -0,0 +1,61 @@
# testing/engines.py
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
"""
.. dialect:: postgresql+psycopg2cffi
:name: psycopg2cffi
:dbapi: psycopg2cffi
:connectstring: \
postgresql+psycopg2cffi://user:password@host:port/dbname\
[?key=value&key=value...]
:url: http://pypi.python.org/pypi/psycopg2cffi/
``psycopg2cffi`` is an adaptation of ``psycopg2``, using CFFI for the C
layer. This makes it suitable for use in e.g. PyPy. Documentation
is as per ``psycopg2``.
.. versionadded:: 1.0.0
.. seealso::
:mod:`sqlalchemy.dialects.postgresql.psycopg2`
"""
from .psycopg2 import PGDialect_psycopg2
class PGDialect_psycopg2cffi(PGDialect_psycopg2):
driver = 'psycopg2cffi'
supports_unicode_statements = True
# psycopg2cffi's first release is 2.5.0, but reports
# __version__ as 2.4.4. Subsequent releases seem to have
# fixed this.
FEATURE_VERSION_MAP = dict(
native_json=(2, 4, 4),
native_jsonb=(2, 7, 1),
sane_multi_rowcount=(2, 4, 4),
array_oid=(2, 4, 4),
hstore_adapter=(2, 4, 4)
)
@classmethod
def dbapi(cls):
return __import__('psycopg2cffi')
@classmethod
def _psycopg2_extensions(cls):
root = __import__('psycopg2cffi', fromlist=['extensions'])
return root.extensions
@classmethod
def _psycopg2_extras(cls):
root = __import__('psycopg2cffi', fromlist=['extras'])
return root.extras
dialect = PGDialect_psycopg2cffi

19
lib/python3.5/site-packages/sqlalchemy/dialects/postgresql/pypostgresql.py
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@ -1,5 +1,5 @@
# postgresql/pypostgresql.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -65,6 +65,23 @@ class PGDialect_pypostgresql(PGDialect):
from postgresql.driver import dbapi20
return dbapi20
_DBAPI_ERROR_NAMES = [
"Error",
"InterfaceError", "DatabaseError", "DataError",
"OperationalError", "IntegrityError", "InternalError",
"ProgrammingError", "NotSupportedError"
]
@util.memoized_property
def dbapi_exception_translation_map(self):
if self.dbapi is None:
return {}
return dict(
(getattr(self.dbapi, name).__name__, name)
for name in self._DBAPI_ERROR_NAMES
)
def create_connect_args(self, url):
opts = url.translate_connect_args(username='user')
if 'port' in opts:

2
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@ -1,4 +1,4 @@
# Copyright (C) 2013-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2013-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under

2
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@ -1,5 +1,5 @@
# postgresql/zxjdbc.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under

4
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@ -1,11 +1,11 @@
# sqlite/__init__.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
from sqlalchemy.dialects.sqlite import base, pysqlite
from sqlalchemy.dialects.sqlite import base, pysqlite, pysqlcipher
# default dialect
base.dialect = pysqlite.dialect

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@ -0,0 +1,116 @@
# sqlite/pysqlcipher.py
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
"""
.. dialect:: sqlite+pysqlcipher
:name: pysqlcipher
:dbapi: pysqlcipher
:connectstring: sqlite+pysqlcipher://:passphrase/file_path[?kdf_iter=<iter>]
:url: https://pypi.python.org/pypi/pysqlcipher
``pysqlcipher`` is a fork of the standard ``pysqlite`` driver to make
use of the `SQLCipher <https://www.zetetic.net/sqlcipher>`_ backend.
.. versionadded:: 0.9.9
Driver
------
The driver here is the `pysqlcipher <https://pypi.python.org/pypi/pysqlcipher>`_
driver, which makes use of the SQLCipher engine. This system essentially
introduces new PRAGMA commands to SQLite which allows the setting of a
passphrase and other encryption parameters, allowing the database
file to be encrypted.
Connect Strings
---------------
The format of the connect string is in every way the same as that
of the :mod:`~sqlalchemy.dialects.sqlite.pysqlite` driver, except that the
"password" field is now accepted, which should contain a passphrase::
e = create_engine('sqlite+pysqlcipher://:testing@/foo.db')
For an absolute file path, two leading slashes should be used for the
database name::
e = create_engine('sqlite+pysqlcipher://:testing@//path/to/foo.db')
A selection of additional encryption-related pragmas supported by SQLCipher
as documented at https://www.zetetic.net/sqlcipher/sqlcipher-api/ can be passed
in the query string, and will result in that PRAGMA being called for each
new connection. Currently, ``cipher``, ``kdf_iter``
``cipher_page_size`` and ``cipher_use_hmac`` are supported::
e = create_engine('sqlite+pysqlcipher://:testing@/foo.db?cipher=aes-256-cfb&kdf_iter=64000')
Pooling Behavior
----------------
The driver makes a change to the default pool behavior of pysqlite
as described in :ref:`pysqlite_threading_pooling`. The pysqlcipher driver
has been observed to be significantly slower on connection than the
pysqlite driver, most likely due to the encryption overhead, so the
dialect here defaults to using the :class:`.SingletonThreadPool`
implementation,
instead of the :class:`.NullPool` pool used by pysqlite. As always, the pool
implementation is entirely configurable using the
:paramref:`.create_engine.poolclass` parameter; the :class:`.StaticPool` may
be more feasible for single-threaded use, or :class:`.NullPool` may be used
to prevent unencrypted connections from being held open for long periods of
time, at the expense of slower startup time for new connections.
"""
from __future__ import absolute_import
from .pysqlite import SQLiteDialect_pysqlite
from ...engine import url as _url
from ... import pool
class SQLiteDialect_pysqlcipher(SQLiteDialect_pysqlite):
driver = 'pysqlcipher'
pragmas = ('kdf_iter', 'cipher', 'cipher_page_size', 'cipher_use_hmac')
@classmethod
def dbapi(cls):
from pysqlcipher import dbapi2 as sqlcipher
return sqlcipher
@classmethod
def get_pool_class(cls, url):
return pool.SingletonThreadPool
def connect(self, *cargs, **cparams):
passphrase = cparams.pop('passphrase', '')
pragmas = dict(
(key, cparams.pop(key, None)) for key in
self.pragmas
)
conn = super(SQLiteDialect_pysqlcipher, self).\
connect(*cargs, **cparams)
conn.execute('pragma key="%s"' % passphrase)
for prag, value in pragmas.items():
if value is not None:
conn.execute('pragma %s=%s' % (prag, value))
return conn
def create_connect_args(self, url):
super_url = _url.URL(
url.drivername, username=url.username,
host=url.host, database=url.database, query=url.query)
c_args, opts = super(SQLiteDialect_pysqlcipher, self).\
create_connect_args(super_url)
opts['passphrase'] = url.password
return c_args, opts
dialect = SQLiteDialect_pysqlcipher

68
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@ -1,5 +1,5 @@
# sqlite/pysqlite.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -200,30 +200,68 @@ is passed containing non-ASCII characters.
.. _pysqlite_serializable:
Serializable Transaction Isolation
----------------------------------
Serializable isolation / Savepoints / Transactional DDL
-------------------------------------------------------
The pysqlite DBAPI driver has a long-standing bug in which transactional
state is not begun until the first DML statement, that is INSERT, UPDATE
or DELETE, is emitted. A SELECT statement will not cause transactional
state to begin. While this mode of usage is fine for typical situations
and has the advantage that the SQLite database file is not prematurely
locked, it breaks serializable transaction isolation, which requires
that the database file be locked upon any SQL being emitted.
In the section :ref:`sqlite_concurrency`, we refer to the pysqlite
driver's assortment of issues that prevent several features of SQLite
from working correctly. The pysqlite DBAPI driver has several
long-standing bugs which impact the correctness of its transactional
behavior. In its default mode of operation, SQLite features such as
SERIALIZABLE isolation, transactional DDL, and SAVEPOINT support are
non-functional, and in order to use these features, workarounds must
be taken.
To work around this issue, the ``BEGIN`` keyword can be emitted
at the start of each transaction. The following recipe establishes
a :meth:`.ConnectionEvents.begin` handler to achieve this::
The issue is essentially that the driver attempts to second-guess the user's
intent, failing to start transactions and sometimes ending them prematurely, in
an effort to minimize the SQLite databases's file locking behavior, even
though SQLite itself uses "shared" locks for read-only activities.
SQLAlchemy chooses to not alter this behavior by default, as it is the
long-expected behavior of the pysqlite driver; if and when the pysqlite
driver attempts to repair these issues, that will be more of a driver towards
defaults for SQLAlchemy.
The good news is that with a few events, we can implement transactional
support fully, by disabling pysqlite's feature entirely and emitting BEGIN
ourselves. This is achieved using two event listeners::
from sqlalchemy import create_engine, event
engine = create_engine("sqlite:///myfile.db",
isolation_level='SERIALIZABLE')
engine = create_engine("sqlite:///myfile.db")
@event.listens_for(engine, "connect")
def do_connect(dbapi_connection, connection_record):
# disable pysqlite's emitting of the BEGIN statement entirely.
# also stops it from emitting COMMIT before any DDL.
dbapi_connection.isolation_level = None
@event.listens_for(engine, "begin")
def do_begin(conn):
# emit our own BEGIN
conn.execute("BEGIN")
Above, we intercept a new pysqlite connection and disable any transactional
integration. Then, at the point at which SQLAlchemy knows that transaction
scope is to begin, we emit ``"BEGIN"`` ourselves.
When we take control of ``"BEGIN"``, we can also control directly SQLite's
locking modes, introduced at `BEGIN TRANSACTION <http://sqlite.org/lang_transaction.html>`_,
by adding the desired locking mode to our ``"BEGIN"``::
@event.listens_for(engine, "begin")
def do_begin(conn):
conn.execute("BEGIN EXCLUSIVE")
.. seealso::
`BEGIN TRANSACTION <http://sqlite.org/lang_transaction.html>`_ - on the SQLite site
`sqlite3 SELECT does not BEGIN a transaction <http://bugs.python.org/issue9924>`_ - on the Python bug tracker
`sqlite3 module breaks transactions and potentially corrupts data <http://bugs.python.org/issue10740>`_ - on the Python bug tracker
"""
from sqlalchemy.dialects.sqlite.base import SQLiteDialect, DATETIME, DATE

2
lib/python3.5/site-packages/sqlalchemy/dialects/sybase/__init__.py
View file

@ -1,5 +1,5 @@
# sybase/__init__.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under

67
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@ -1,5 +1,5 @@
# sybase/base.py
# Copyright (C) 2010-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2010-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
# get_select_precolumns(), limit_clause() implementation
# copyright (C) 2007 Fisch Asset Management
@ -98,7 +98,6 @@ RESERVED_WORDS = set([
class _SybaseUnitypeMixin(object):
"""these types appear to return a buffer object."""
def result_processor(self, dialect, coltype):
@ -147,41 +146,40 @@ class IMAGE(sqltypes.LargeBinary):
class SybaseTypeCompiler(compiler.GenericTypeCompiler):
def visit_large_binary(self, type_):
def visit_large_binary(self, type_, **kw):
return self.visit_IMAGE(type_)
def visit_boolean(self, type_):
def visit_boolean(self, type_, **kw):
return self.visit_BIT(type_)
def visit_unicode(self, type_):
def visit_unicode(self, type_, **kw):
return self.visit_NVARCHAR(type_)
def visit_UNICHAR(self, type_):
def visit_UNICHAR(self, type_, **kw):
return "UNICHAR(%d)" % type_.length
def visit_UNIVARCHAR(self, type_):
def visit_UNIVARCHAR(self, type_, **kw):
return "UNIVARCHAR(%d)" % type_.length
def visit_UNITEXT(self, type_):
def visit_UNITEXT(self, type_, **kw):
return "UNITEXT"
def visit_TINYINT(self, type_):
def visit_TINYINT(self, type_, **kw):
return "TINYINT"
def visit_IMAGE(self, type_):
def visit_IMAGE(self, type_, **kw):
return "IMAGE"
def visit_BIT(self, type_):
def visit_BIT(self, type_, **kw):
return "BIT"
def visit_MONEY(self, type_):
def visit_MONEY(self, type_, **kw):
return "MONEY"
def visit_SMALLMONEY(self, type_):
def visit_SMALLMONEY(self, type_, **kw):
return "SMALLMONEY"
def visit_UNIQUEIDENTIFIER(self, type_):
def visit_UNIQUEIDENTIFIER(self, type_, **kw):
return "UNIQUEIDENTIFIER"
ischema_names = {
@ -325,28 +323,30 @@ class SybaseSQLCompiler(compiler.SQLCompiler):
'milliseconds': 'millisecond'
})
def get_select_precolumns(self, select):
def get_select_precolumns(self, select, **kw):
s = select._distinct and "DISTINCT " or ""
# TODO: don't think Sybase supports
# bind params for FIRST / TOP
if select._limit:
limit = select._limit
if limit:
# if select._limit == 1:
# s += "FIRST "
# s += "FIRST "
# else:
# s += "TOP %s " % (select._limit,)
s += "TOP %s " % (select._limit,)
if select._offset:
if not select._limit:
# s += "TOP %s " % (select._limit,)
s += "TOP %s " % (limit,)
offset = select._offset
if offset:
if not limit:
# FIXME: sybase doesn't allow an offset without a limit
# so use a huge value for TOP here
s += "TOP 1000000 "
s += "START AT %s " % (select._offset + 1,)
s += "START AT %s " % (offset + 1,)
return s
def get_from_hint_text(self, table, text):
return text
def limit_clause(self, select):
def limit_clause(self, select, **kw):
# Limit in sybase is after the select keyword
return ""
@ -375,10 +375,10 @@ class SybaseSQLCompiler(compiler.SQLCompiler):
class SybaseDDLCompiler(compiler.DDLCompiler):
def get_column_specification(self, column, **kwargs):
colspec = self.preparer.format_column(column) + " " + \
self.dialect.type_compiler.process(column.type)
self.dialect.type_compiler.process(
column.type, type_expression=column)
if column.table is None:
raise exc.CompileError(
@ -608,8 +608,8 @@ class SybaseDialect(default.DefaultDialect):
FROM sysreferences r JOIN sysobjects o on r.tableid = o.id
WHERE r.tableid = :table_id
""")
referential_constraints = connection.execute(REFCONSTRAINT_SQL,
table_id=table_id)
referential_constraints = connection.execute(
REFCONSTRAINT_SQL, table_id=table_id).fetchall()
REFTABLE_SQL = text("""
SELECT o.name AS name, u.name AS 'schema'
@ -740,10 +740,13 @@ class SybaseDialect(default.DefaultDialect):
results.close()
constrained_columns = []
for i in range(1, pks["count"] + 1):
constrained_columns.append(pks["pk_%i" % (i,)])
return {"constrained_columns": constrained_columns,
"name": pks["name"]}
if pks:
for i in range(1, pks["count"] + 1):
constrained_columns.append(pks["pk_%i" % (i,)])
return {"constrained_columns": constrained_columns,
"name": pks["name"]}
else:
return {"constrained_columns": [], "name": None}
@reflection.cache
def get_schema_names(self, connection, **kw):

2
lib/python3.5/site-packages/sqlalchemy/dialects/sybase/mxodbc.py
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@ -1,5 +1,5 @@
# sybase/mxodbc.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under

2
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View file

@ -1,5 +1,5 @@
# sybase/pyodbc.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under

2
lib/python3.5/site-packages/sqlalchemy/dialects/sybase/pysybase.py
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@ -1,5 +1,5 @@
# sybase/pysybase.py
# Copyright (C) 2010-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2010-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under

73
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@ -1,5 +1,5 @@
# engine/__init__.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -72,6 +72,7 @@ from .base import (
)
from .result import (
BaseRowProxy,
BufferedColumnResultProxy,
BufferedColumnRow,
BufferedRowResultProxy,
@ -248,6 +249,34 @@ def create_engine(*args, **kwargs):
Microsoft SQL Server. Set this to ``False`` to disable
the automatic usage of RETURNING.
:param isolation_level: this string parameter is interpreted by various
dialects in order to affect the transaction isolation level of the
database connection. The parameter essentially accepts some subset of
these string arguments: ``"SERIALIZABLE"``, ``"REPEATABLE_READ"``,
``"READ_COMMITTED"``, ``"READ_UNCOMMITTED"`` and ``"AUTOCOMMIT"``.
Behavior here varies per backend, and
individual dialects should be consulted directly.
Note that the isolation level can also be set on a per-:class:`.Connection`
basis as well, using the
:paramref:`.Connection.execution_options.isolation_level`
feature.
.. seealso::
:attr:`.Connection.default_isolation_level` - view default level
:paramref:`.Connection.execution_options.isolation_level`
- set per :class:`.Connection` isolation level
:ref:`SQLite Transaction Isolation <sqlite_isolation_level>`
:ref:`Postgresql Transaction Isolation <postgresql_isolation_level>`
:ref:`MySQL Transaction Isolation <mysql_isolation_level>`
:ref:`session_transaction_isolation` - for the ORM
:param label_length=None: optional integer value which limits
the size of dynamically generated column labels to that many
characters. If less than 6, labels are generated as
@ -276,6 +305,17 @@ def create_engine(*args, **kwargs):
be used instead. Can be used for testing of DBAPIs as well as to
inject "mock" DBAPI implementations into the :class:`.Engine`.
:param paramstyle=None: The `paramstyle <http://legacy.python.org/dev/peps/pep-0249/#paramstyle>`_
to use when rendering bound parameters. This style defaults to the
one recommended by the DBAPI itself, which is retrieved from the
``.paramstyle`` attribute of the DBAPI. However, most DBAPIs accept
more than one paramstyle, and in particular it may be desirable
to change a "named" paramstyle into a "positional" one, or vice versa.
When this attribute is passed, it should be one of the values
``"qmark"``, ``"numeric"``, ``"named"``, ``"format"`` or
``"pyformat"``, and should correspond to a parameter style known
to be supported by the DBAPI in use.
:param pool=None: an already-constructed instance of
:class:`~sqlalchemy.pool.Pool`, such as a
:class:`~sqlalchemy.pool.QueuePool` instance. If non-None, this
@ -349,14 +389,33 @@ def create_engine(*args, **kwargs):
def engine_from_config(configuration, prefix='sqlalchemy.', **kwargs):
"""Create a new Engine instance using a configuration dictionary.
The dictionary is typically produced from a config file where keys
are prefixed, such as sqlalchemy.url, sqlalchemy.echo, etc. The
'prefix' argument indicates the prefix to be searched for.
The dictionary is typically produced from a config file.
The keys of interest to ``engine_from_config()`` should be prefixed, e.g.
``sqlalchemy.url``, ``sqlalchemy.echo``, etc. The 'prefix' argument
indicates the prefix to be searched for. Each matching key (after the
prefix is stripped) is treated as though it were the corresponding keyword
argument to a :func:`.create_engine` call.
The only required key is (assuming the default prefix) ``sqlalchemy.url``,
which provides the :ref:`database URL <database_urls>`.
A select set of keyword arguments will be "coerced" to their
expected type based on string values. In a future release, this
functionality will be expanded and include dialect-specific
arguments.
expected type based on string values. The set of arguments
is extensible per-dialect using the ``engine_config_types`` accessor.
:param configuration: A dictionary (typically produced from a config file,
but this is not a requirement). Items whose keys start with the value
of 'prefix' will have that prefix stripped, and will then be passed to
:ref:`create_engine`.
:param prefix: Prefix to match and then strip from keys
in 'configuration'.
:param kwargs: Each keyword argument to ``engine_from_config()`` itself
overrides the corresponding item taken from the 'configuration'
dictionary. Keyword arguments should *not* be prefixed.
"""
options = dict((key[len(prefix):], configuration[key])

542
lib/python3.5/site-packages/sqlalchemy/engine/base.py
View file

@ -1,5 +1,5 @@
# engine/base.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -45,7 +45,7 @@ class Connection(Connectable):
"""
def __init__(self, engine, connection=None, close_with_result=False,
_branch=False, _execution_options=None,
_branch_from=None, _execution_options=None,
_dispatch=None,
_has_events=None):
"""Construct a new Connection.
@ -57,48 +57,80 @@ class Connection(Connectable):
"""
self.engine = engine
self.dialect = engine.dialect
self.__connection = connection or engine.raw_connection()
self.__transaction = None
self.should_close_with_result = close_with_result
self.__savepoint_seq = 0
self.__branch = _branch
self.__invalid = False
self.__can_reconnect = True
if _dispatch:
self.dispatch = _dispatch
elif _has_events is None:
# if _has_events is sent explicitly as False,
# then don't join the dispatch of the engine; we don't
# want to handle any of the engine's events in that case.
self.dispatch = self.dispatch._join(engine.dispatch)
self._has_events = _has_events or (
_has_events is None and engine._has_events)
self.__branch_from = _branch_from
self.__branch = _branch_from is not None
self._echo = self.engine._should_log_info()
if _execution_options:
self._execution_options =\
engine._execution_options.union(_execution_options)
if _branch_from:
self.__connection = connection
self._execution_options = _execution_options
self._echo = _branch_from._echo
self.should_close_with_result = False
self.dispatch = _dispatch
self._has_events = _branch_from._has_events
else:
self.__connection = connection \
if connection is not None else engine.raw_connection()
self.__transaction = None
self.__savepoint_seq = 0
self.should_close_with_result = close_with_result
self.__invalid = False
self.__can_reconnect = True
self._echo = self.engine._should_log_info()
if _has_events is None:
# if _has_events is sent explicitly as False,
# then don't join the dispatch of the engine; we don't
# want to handle any of the engine's events in that case.
self.dispatch = self.dispatch._join(engine.dispatch)
self._has_events = _has_events or (
_has_events is None and engine._has_events)
assert not _execution_options
self._execution_options = engine._execution_options
if self._has_events or self.engine._has_events:
self.dispatch.engine_connect(self, _branch)
self.dispatch.engine_connect(self, self.__branch)
def _branch(self):
"""Return a new Connection which references this Connection's
engine and connection; but does not have close_with_result enabled,
and also whose close() method does nothing.
This is used to execute "sub" statements within a single execution,
usually an INSERT statement.
The Core uses this very sparingly, only in the case of
custom SQL default functions that are to be INSERTed as the
primary key of a row where we need to get the value back, so we have
to invoke it distinctly - this is a very uncommon case.
Userland code accesses _branch() when the connect() or
contextual_connect() methods are called. The branched connection
acts as much as possible like the parent, except that it stays
connected when a close() event occurs.
"""
if self.__branch_from:
return self.__branch_from._branch()
else:
return self.engine._connection_cls(
self.engine,
self.__connection,
_branch_from=self,
_execution_options=self._execution_options,
_has_events=self._has_events,
_dispatch=self.dispatch)
@property
def _root(self):
"""return the 'root' connection.
Returns 'self' if this connection is not a branch, else
returns the root connection from which we ultimately branched.
"""
return self.engine._connection_cls(
self.engine,
self.__connection,
_branch=True,
_has_events=self._has_events,
_dispatch=self.dispatch)
if self.__branch_from:
return self.__branch_from
else:
return self
def _clone(self):
"""Create a shallow copy of this Connection.
@ -169,14 +201,19 @@ class Connection(Connectable):
used by the ORM internally supersedes a cache dictionary
specified here.
:param isolation_level: Available on: Connection.
:param isolation_level: Available on: :class:`.Connection`.
Set the transaction isolation level for
the lifespan of this connection. Valid values include
those string values accepted by the ``isolation_level``
parameter passed to :func:`.create_engine`, and are
database specific, including those for :ref:`sqlite_toplevel`,
:ref:`postgresql_toplevel` - see those dialect's documentation
for further info.
the lifespan of this :class:`.Connection` object (*not* the
underyling DBAPI connection, for which the level is reset
to its original setting upon termination of this
:class:`.Connection` object).
Valid values include
those string values accepted by the
:paramref:`.create_engine.isolation_level`
parameter passed to :func:`.create_engine`. These levels are
semi-database specific; see individual dialect documentation for
valid levels.
Note that this option necessarily affects the underlying
DBAPI connection for the lifespan of the originating
@ -185,6 +222,41 @@ class Connection(Connectable):
is returned to the connection pool, i.e.
the :meth:`.Connection.close` method is called.
.. warning:: The ``isolation_level`` execution option should
**not** be used when a transaction is already established, that
is, the :meth:`.Connection.begin` method or similar has been
called. A database cannot change the isolation level on a
transaction in progress, and different DBAPIs and/or
SQLAlchemy dialects may implicitly roll back or commit
the transaction, or not affect the connection at all.
.. versionchanged:: 0.9.9 A warning is emitted when the
``isolation_level`` execution option is used after a
transaction has been started with :meth:`.Connection.begin`
or similar.
.. note:: The ``isolation_level`` execution option is implicitly
reset if the :class:`.Connection` is invalidated, e.g. via
the :meth:`.Connection.invalidate` method, or if a
disconnection error occurs. The new connection produced after
the invalidation will not have the isolation level re-applied
to it automatically.
.. seealso::
:paramref:`.create_engine.isolation_level`
- set per :class:`.Engine` isolation level
:meth:`.Connection.get_isolation_level` - view current level
:ref:`SQLite Transaction Isolation <sqlite_isolation_level>`
:ref:`Postgresql Transaction Isolation <postgresql_isolation_level>`
:ref:`MySQL Transaction Isolation <mysql_isolation_level>`
:ref:`session_transaction_isolation` - for the ORM
:param no_parameters: When ``True``, if the final parameter
list or dictionary is totally empty, will invoke the
statement on the cursor as ``cursor.execute(statement)``,
@ -224,24 +296,101 @@ class Connection(Connectable):
def invalidated(self):
"""Return True if this connection was invalidated."""
return self.__invalid
return self._root.__invalid
@property
def connection(self):
"The underlying DB-API connection managed by this Connection."
"""The underlying DB-API connection managed by this Connection.
.. seealso::
:ref:`dbapi_connections`
"""
try:
return self.__connection
except AttributeError:
return self._revalidate_connection()
try:
return self._revalidate_connection()
except Exception as e:
self._handle_dbapi_exception(e, None, None, None, None)
def get_isolation_level(self):
"""Return the current isolation level assigned to this
:class:`.Connection`.
This will typically be the default isolation level as determined
by the dialect, unless if the
:paramref:`.Connection.execution_options.isolation_level`
feature has been used to alter the isolation level on a
per-:class:`.Connection` basis.
This attribute will typically perform a live SQL operation in order
to procure the current isolation level, so the value returned is the
actual level on the underlying DBAPI connection regardless of how
this state was set. Compare to the
:attr:`.Connection.default_isolation_level` accessor
which returns the dialect-level setting without performing a SQL
query.
.. versionadded:: 0.9.9
.. seealso::
:attr:`.Connection.default_isolation_level` - view default level
:paramref:`.create_engine.isolation_level`
- set per :class:`.Engine` isolation level
:paramref:`.Connection.execution_options.isolation_level`
- set per :class:`.Connection` isolation level
"""
try:
return self.dialect.get_isolation_level(self.connection)
except Exception as e:
self._handle_dbapi_exception(e, None, None, None, None)
@property
def default_isolation_level(self):
"""The default isolation level assigned to this :class:`.Connection`.
This is the isolation level setting that the :class:`.Connection`
has when first procured via the :meth:`.Engine.connect` method.
This level stays in place until the
:paramref:`.Connection.execution_options.isolation_level` is used
to change the setting on a per-:class:`.Connection` basis.
Unlike :meth:`.Connection.get_isolation_level`, this attribute is set
ahead of time from the first connection procured by the dialect,
so SQL query is not invoked when this accessor is called.
.. versionadded:: 0.9.9
.. seealso::
:meth:`.Connection.get_isolation_level` - view current level
:paramref:`.create_engine.isolation_level`
- set per :class:`.Engine` isolation level
:paramref:`.Connection.execution_options.isolation_level`
- set per :class:`.Connection` isolation level
"""
return self.dialect.default_isolation_level
def _revalidate_connection(self):
if self.__branch_from:
return self.__branch_from._revalidate_connection()
if self.__can_reconnect and self.__invalid:
if self.__transaction is not None:
raise exc.InvalidRequestError(
"Can't reconnect until invalid "
"transaction is rolled back")
self.__connection = self.engine.raw_connection()
self.__connection = self.engine.raw_connection(_connection=self)
self.__invalid = False
return self.__connection
raise exc.ResourceClosedError("This Connection is closed")
@ -343,16 +492,17 @@ class Connection(Connectable):
:ref:`pool_connection_invalidation`
"""
if self.invalidated:
return
if self.closed:
raise exc.ResourceClosedError("This Connection is closed")
if self._connection_is_valid:
self.__connection.invalidate(exception)
del self.__connection
self.__invalid = True
if self._root._connection_is_valid:
self._root.__connection.invalidate(exception)
del self._root.__connection
self._root.__invalid = True
def detach(self):
"""Detach the underlying DB-API connection from its connection pool.
@ -415,6 +565,8 @@ class Connection(Connectable):
:class:`.Engine`.
"""
if self.__branch_from:
return self.__branch_from.begin()
if self.__transaction is None:
self.__transaction = RootTransaction(self)
@ -436,6 +588,9 @@ class Connection(Connectable):
See also :meth:`.Connection.begin`,
:meth:`.Connection.begin_twophase`.
"""
if self.__branch_from:
return self.__branch_from.begin_nested()
if self.__transaction is None:
self.__transaction = RootTransaction(self)
else:
@ -459,6 +614,9 @@ class Connection(Connectable):
"""
if self.__branch_from:
return self.__branch_from.begin_twophase(xid=xid)
if self.__transaction is not None:
raise exc.InvalidRequestError(
"Cannot start a two phase transaction when a transaction "
@ -479,10 +637,11 @@ class Connection(Connectable):
def in_transaction(self):
"""Return True if a transaction is in progress."""
return self.__transaction is not None
return self._root.__transaction is not None
def _begin_impl(self, transaction):
assert not self.__branch_from
if self._echo:
self.engine.logger.info("BEGIN (implicit)")
@ -497,6 +656,8 @@ class Connection(Connectable):
self._handle_dbapi_exception(e, None, None, None, None)
def _rollback_impl(self):
assert not self.__branch_from
if self._has_events or self.engine._has_events:
self.dispatch.rollback(self)
@ -516,6 +677,8 @@ class Connection(Connectable):
self.__transaction = None
def _commit_impl(self, autocommit=False):
assert not self.__branch_from
if self._has_events or self.engine._has_events:
self.dispatch.commit(self)
@ -532,6 +695,8 @@ class Connection(Connectable):
self.__transaction = None
def _savepoint_impl(self, name=None):
assert not self.__branch_from
if self._has_events or self.engine._has_events:
self.dispatch.savepoint(self, name)
@ -543,6 +708,8 @@ class Connection(Connectable):
return name
def _rollback_to_savepoint_impl(self, name, context):
assert not self.__branch_from
if self._has_events or self.engine._has_events:
self.dispatch.rollback_savepoint(self, name, context)
@ -551,6 +718,8 @@ class Connection(Connectable):
self.__transaction = context
def _release_savepoint_impl(self, name, context):
assert not self.__branch_from
if self._has_events or self.engine._has_events:
self.dispatch.release_savepoint(self, name, context)
@ -559,6 +728,8 @@ class Connection(Connectable):
self.__transaction = context
def _begin_twophase_impl(self, transaction):
assert not self.__branch_from
if self._echo:
self.engine.logger.info("BEGIN TWOPHASE (implicit)")
if self._has_events or self.engine._has_events:
@ -571,6 +742,8 @@ class Connection(Connectable):
self.connection._reset_agent = transaction
def _prepare_twophase_impl(self, xid):
assert not self.__branch_from
if self._has_events or self.engine._has_events:
self.dispatch.prepare_twophase(self, xid)
@ -579,6 +752,8 @@ class Connection(Connectable):
self.engine.dialect.do_prepare_twophase(self, xid)
def _rollback_twophase_impl(self, xid, is_prepared):
assert not self.__branch_from
if self._has_events or self.engine._has_events:
self.dispatch.rollback_twophase(self, xid, is_prepared)
@ -595,6 +770,8 @@ class Connection(Connectable):
self.__transaction = None
def _commit_twophase_impl(self, xid, is_prepared):
assert not self.__branch_from
if self._has_events or self.engine._has_events:
self.dispatch.commit_twophase(self, xid, is_prepared)
@ -610,8 +787,8 @@ class Connection(Connectable):
self.__transaction = None
def _autorollback(self):
if not self.in_transaction():
self._rollback_impl()
if not self._root.in_transaction():
self._root._rollback_impl()
def close(self):
"""Close this :class:`.Connection`.
@ -632,13 +809,21 @@ class Connection(Connectable):
and will allow no further operations.
"""
if self.__branch_from:
try:
del self.__connection
except AttributeError:
pass
finally:
self.__can_reconnect = False
return
try:
conn = self.__connection
except AttributeError:
pass
else:
if not self.__branch:
conn.close()
conn.close()
if conn._reset_agent is self.__transaction:
conn._reset_agent = None
@ -670,7 +855,7 @@ class Connection(Connectable):
a subclass of :class:`.Executable`, such as a
:func:`~.expression.select` construct
* a :class:`.FunctionElement`, such as that generated
by :attr:`.func`, will be automatically wrapped in
by :data:`.func`, will be automatically wrapped in
a SELECT statement, which is then executed.
* a :class:`.DDLElement` object
* a :class:`.DefaultGenerator` object
@ -798,17 +983,16 @@ class Connection(Connectable):
distilled_params = _distill_params(multiparams, params)
if distilled_params:
# note this is usually dict but we support RowProxy
# as well; but dict.keys() as an iterator is OK
# as well; but dict.keys() as an iterable is OK
keys = distilled_params[0].keys()
else:
keys = []
dialect = self.dialect
if 'compiled_cache' in self._execution_options:
key = dialect, elem, tuple(keys), len(distilled_params) > 1
if key in self._execution_options['compiled_cache']:
compiled_sql = self._execution_options['compiled_cache'][key]
else:
key = dialect, elem, tuple(sorted(keys)), len(distilled_params) > 1
compiled_sql = self._execution_options['compiled_cache'].get(key)
if compiled_sql is None:
compiled_sql = elem.compile(
dialect=dialect, column_keys=keys,
inline=len(distilled_params) > 1)
@ -888,9 +1072,10 @@ class Connection(Connectable):
context = constructor(dialect, self, conn, *args)
except Exception as e:
self._handle_dbapi_exception(e,
util.text_type(statement), parameters,
None, None)
self._handle_dbapi_exception(
e,
util.text_type(statement), parameters,
None, None)
if context.compiled:
context.pre_exec()
@ -914,36 +1099,39 @@ class Connection(Connectable):
"%r",
sql_util._repr_params(parameters, batches=10)
)
evt_handled = False
try:
if context.executemany:
for fn in () if not self.dialect._has_events \
else self.dialect.dispatch.do_executemany:
if fn(cursor, statement, parameters, context):
break
else:
if self.dialect._has_events:
for fn in self.dialect.dispatch.do_executemany:
if fn(cursor, statement, parameters, context):
evt_handled = True
break
if not evt_handled:
self.dialect.do_executemany(
cursor,
statement,
parameters,
context)
elif not parameters and context.no_parameters:
for fn in () if not self.dialect._has_events \
else self.dialect.dispatch.do_execute_no_params:
if fn(cursor, statement, context):
break
else:
if self.dialect._has_events:
for fn in self.dialect.dispatch.do_execute_no_params:
if fn(cursor, statement, context):
evt_handled = True
break
if not evt_handled:
self.dialect.do_execute_no_params(
cursor,
statement,
context)
else:
for fn in () if not self.dialect._has_events \
else self.dialect.dispatch.do_execute:
if fn(cursor, statement, parameters, context):
break
else:
if self.dialect._has_events:
for fn in self.dialect.dispatch.do_execute:
if fn(cursor, statement, parameters, context):
evt_handled = True
break
if not evt_handled:
self.dialect.do_execute(
cursor,
statement,
@ -967,36 +1155,17 @@ class Connection(Connectable):
if context.compiled:
context.post_exec()
if context.isinsert and not context.executemany:
context.post_insert()
if context.is_crud or context.is_text:
result = context._setup_crud_result_proxy()
else:
result = context.get_result_proxy()
if result._metadata is None:
result._soft_close(_autoclose_connection=False)
# create a resultproxy, get rowcount/implicit RETURNING
# rows, close cursor if no further results pending
result = context.get_result_proxy()
if context.isinsert:
if context._is_implicit_returning:
context._fetch_implicit_returning(result)
result.close(_autoclose_connection=False)
result._metadata = None
elif not context._is_explicit_returning:
result.close(_autoclose_connection=False)
result._metadata = None
elif context.isupdate and context._is_implicit_returning:
context._fetch_implicit_update_returning(result)
result.close(_autoclose_connection=False)
result._metadata = None
if context.should_autocommit and self._root.__transaction is None:
self._root._commit_impl(autocommit=True)
elif result._metadata is None:
# no results, get rowcount
# (which requires open cursor on some drivers
# such as kintersbasdb, mxodbc),
result.rowcount
result.close(_autoclose_connection=False)
if self.__transaction is None and context.should_autocommit:
self._commit_impl(autocommit=True)
if result.closed and self.should_close_with_result:
if result._soft_closed and self.should_close_with_result:
self.close()
return result
@ -1055,8 +1224,6 @@ class Connection(Connectable):
"""
try:
cursor.close()
except (SystemExit, KeyboardInterrupt):
raise
except Exception:
# log the error through the connection pool's logger.
self.engine.pool.logger.error(
@ -1071,7 +1238,6 @@ class Connection(Connectable):
parameters,
cursor,
context):
exc_info = sys.exc_info()
if context and context.exception is None:
@ -1081,16 +1247,22 @@ class Connection(Connectable):
self._is_disconnect = \
isinstance(e, self.dialect.dbapi.Error) and \
not self.closed and \
self.dialect.is_disconnect(e, self.__connection, cursor)
self.dialect.is_disconnect(
e,
self.__connection if not self.invalidated else None,
cursor)
if context:
context.is_disconnect = self._is_disconnect
invalidate_pool_on_disconnect = True
if self._reentrant_error:
util.raise_from_cause(
exc.DBAPIError.instance(statement,
parameters,
e,
self.dialect.dbapi.Error),
self.dialect.dbapi.Error,
dialect=self.dialect),
exc_info
)
self._reentrant_error = True
@ -1106,13 +1278,16 @@ class Connection(Connectable):
parameters,
e,
self.dialect.dbapi.Error,
connection_invalidated=self._is_disconnect)
connection_invalidated=self._is_disconnect,
dialect=self.dialect)
else:
sqlalchemy_exception = None
newraise = None
if self._has_events or self.engine._has_events:
if (self._has_events or self.engine._has_events) and \
not self._execution_options.get(
'skip_user_error_events', False):
# legacy dbapi_error event
if should_wrap and context:
self.dispatch.dbapi_error(self,
@ -1124,7 +1299,8 @@ class Connection(Connectable):
# new handle_error event
ctx = ExceptionContextImpl(
e, sqlalchemy_exception, self, cursor, statement,
e, sqlalchemy_exception, self.engine,
self, cursor, statement,
parameters, context, self._is_disconnect)
for fn in self.dispatch.handle_error:
@ -1144,6 +1320,11 @@ class Connection(Connectable):
sqlalchemy_exception.connection_invalidated = \
self._is_disconnect = ctx.is_disconnect
# set up potentially user-defined value for
# invalidate pool.
invalidate_pool_on_disconnect = \
ctx.invalidate_pool_on_disconnect
if should_wrap and context:
context.handle_dbapi_exception(e)
@ -1166,12 +1347,66 @@ class Connection(Connectable):
del self._reentrant_error
if self._is_disconnect:
del self._is_disconnect
dbapi_conn_wrapper = self.connection
self.engine.pool._invalidate(dbapi_conn_wrapper, e)
self.invalidate(e)
if not self.invalidated:
dbapi_conn_wrapper = self.__connection
if invalidate_pool_on_disconnect:
self.engine.pool._invalidate(dbapi_conn_wrapper, e)
self.invalidate(e)
if self.should_close_with_result:
self.close()
@classmethod
def _handle_dbapi_exception_noconnection(cls, e, dialect, engine):
exc_info = sys.exc_info()
is_disconnect = dialect.is_disconnect(e, None, None)
should_wrap = isinstance(e, dialect.dbapi.Error)
if should_wrap:
sqlalchemy_exception = exc.DBAPIError.instance(
None,
None,
e,
dialect.dbapi.Error,
connection_invalidated=is_disconnect)
else:
sqlalchemy_exception = None
newraise = None
if engine._has_events:
ctx = ExceptionContextImpl(
e, sqlalchemy_exception, engine, None, None, None,
None, None, is_disconnect)
for fn in engine.dispatch.handle_error:
try:
# handler returns an exception;
# call next handler in a chain
per_fn = fn(ctx)
if per_fn is not None:
ctx.chained_exception = newraise = per_fn
except Exception as _raised:
# handler raises an exception - stop processing
newraise = _raised
break
if sqlalchemy_exception and \
is_disconnect != ctx.is_disconnect:
sqlalchemy_exception.connection_invalidated = \
is_disconnect = ctx.is_disconnect
if newraise:
util.raise_from_cause(newraise, exc_info)
elif should_wrap:
util.raise_from_cause(
sqlalchemy_exception,
exc_info
)
else:
util.reraise(*exc_info)
def default_schema_name(self):
return self.engine.dialect.get_default_schema_name(self)
@ -1250,8 +1485,9 @@ class ExceptionContextImpl(ExceptionContext):
"""Implement the :class:`.ExceptionContext` interface."""
def __init__(self, exception, sqlalchemy_exception,
connection, cursor, statement, parameters,
engine, connection, cursor, statement, parameters,
context, is_disconnect):
self.engine = engine
self.connection = connection
self.sqlalchemy_exception = sqlalchemy_exception
self.original_exception = exception
@ -1295,9 +1531,13 @@ class Transaction(object):
def __init__(self, connection, parent):
self.connection = connection
self._parent = parent or self
self._actual_parent = parent
self.is_active = True
@property
def _parent(self):
return self._actual_parent or self
def close(self):
"""Close this :class:`.Transaction`.
@ -1575,29 +1815,28 @@ class Engine(Connectable, log.Identified):
def dispose(self):
"""Dispose of the connection pool used by this :class:`.Engine`.
This has the effect of fully closing all **currently checked in**
database connections. Connections that are still checked out
will **not** be closed, however they will no longer be associated
with this :class:`.Engine`, so when they are closed individually,
eventually the :class:`.Pool` which they are associated with will
be garbage collected and they will be closed out fully, if
not already closed on checkin.
A new connection pool is created immediately after the old one has
been disposed. This new pool, like all SQLAlchemy connection pools,
does not make any actual connections to the database until one is
first requested.
first requested, so as long as the :class:`.Engine` isn't used again,
no new connections will be made.
This method has two general use cases:
.. seealso::
* When a dropped connection is detected, it is assumed that all
connections held by the pool are potentially dropped, and
the entire pool is replaced.
* An application may want to use :meth:`dispose` within a test
suite that is creating multiple engines.
It is critical to note that :meth:`dispose` does **not** guarantee
that the application will release all open database connections - only
those connections that are checked into the pool are closed.
Connections which remain checked out or have been detached from
the engine are not affected.
:ref:`engine_disposal`
"""
self.pool.dispose()
self.pool = self.pool.recreate()
self.dispatch.engine_disposed(self)
def _execute_default(self, default):
with self.contextual_connect() as conn:
@ -1795,10 +2034,11 @@ class Engine(Connectable, log.Identified):
"""
return self._connection_cls(self,
self.pool.connect(),
close_with_result=close_with_result,
**kwargs)
return self._connection_cls(
self,
self._wrap_pool_connect(self.pool.connect, None),
close_with_result=close_with_result,
**kwargs)
def table_names(self, schema=None, connection=None):
"""Return a list of all table names available in the database.
@ -1828,7 +2068,18 @@ class Engine(Connectable, log.Identified):
"""
return self.run_callable(self.dialect.has_table, table_name, schema)
def raw_connection(self):
def _wrap_pool_connect(self, fn, connection):
dialect = self.dialect
try:
return fn()
except dialect.dbapi.Error as e:
if connection is None:
Connection._handle_dbapi_exception_noconnection(
e, dialect, self)
else:
util.reraise(*sys.exc_info())
def raw_connection(self, _connection=None):
"""Return a "raw" DBAPI connection from the connection pool.
The returned object is a proxied version of the DBAPI
@ -1839,13 +2090,18 @@ class Engine(Connectable, log.Identified):
for real.
This method provides direct DBAPI connection access for
special situations. In most situations, the :class:`.Connection`
object should be used, which is procured using the
:meth:`.Engine.connect` method.
special situations when the API provided by :class:`.Connection`
is not needed. When a :class:`.Connection` object is already
present, the DBAPI connection is available using
the :attr:`.Connection.connection` accessor.
.. seealso::
:ref:`dbapi_connections`
"""
return self.pool.unique_connection()
return self._wrap_pool_connect(
self.pool.unique_connection, _connection)
class OptionEngine(Engine):

318
lib/python3.5/site-packages/sqlalchemy/engine/default.py
View file

@ -1,5 +1,5 @@
# engine/default.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -61,14 +61,13 @@ class DefaultDialect(interfaces.Dialect):
engine_config_types = util.immutabledict([
('convert_unicode', util.bool_or_str('force')),
('pool_timeout', int),
('pool_timeout', util.asint),
('echo', util.bool_or_str('debug')),
('echo_pool', util.bool_or_str('debug')),
('pool_recycle', int),
('pool_size', int),
('max_overflow', int),
('pool_threadlocal', bool),
('use_native_unicode', bool),
('pool_recycle', util.asint),
('pool_size', util.asint),
('max_overflow', util.asint),
('pool_threadlocal', util.asbool),
])
# if the NUMERIC type
@ -157,6 +156,15 @@ class DefaultDialect(interfaces.Dialect):
reflection_options = ()
dbapi_exception_translation_map = util.immutabledict()
"""mapping used in the extremely unusual case that a DBAPI's
published exceptions don't actually have the __name__ that they
are linked towards.
.. versionadded:: 1.0.5
"""
def __init__(self, convert_unicode=False,
encoding='utf-8', paramstyle=None, dbapi=None,
implicit_returning=None,
@ -395,6 +403,12 @@ class DefaultDialect(interfaces.Dialect):
self._set_connection_isolation(connection, opts['isolation_level'])
def _set_connection_isolation(self, connection, level):
if connection.in_transaction():
util.warn(
"Connection is already established with a Transaction; "
"setting isolation_level may implicitly rollback or commit "
"the existing transaction, or have no effect until "
"next transaction")
self.set_isolation_level(connection.connection, level)
connection.connection._connection_record.\
finalize_callback.append(self.reset_isolation_level)
@ -452,14 +466,13 @@ class DefaultExecutionContext(interfaces.ExecutionContext):
isinsert = False
isupdate = False
isdelete = False
is_crud = False
is_text = False
isddl = False
executemany = False
result_map = None
compiled = None
statement = None
postfetch_cols = None
prefetch_cols = None
returning_cols = None
result_column_struct = None
_is_implicit_returning = False
_is_explicit_returning = False
@ -472,10 +485,9 @@ class DefaultExecutionContext(interfaces.ExecutionContext):
"""Initialize execution context for a DDLElement construct."""
self = cls.__new__(cls)
self.dialect = dialect
self.root_connection = connection
self._dbapi_connection = dbapi_connection
self.engine = connection.engine
self.dialect = connection.dialect
self.compiled = compiled = compiled_ddl
self.isddl = True
@ -507,25 +519,20 @@ class DefaultExecutionContext(interfaces.ExecutionContext):
"""Initialize execution context for a Compiled construct."""
self = cls.__new__(cls)
self.dialect = dialect
self.root_connection = connection
self._dbapi_connection = dbapi_connection
self.engine = connection.engine
self.dialect = connection.dialect
self.compiled = compiled
if not compiled.can_execute:
raise exc.ArgumentError("Not an executable clause")
self.execution_options = compiled.statement._execution_options
if connection._execution_options:
self.execution_options = dict(self.execution_options)
self.execution_options.update(connection._execution_options)
self.execution_options = compiled.statement._execution_options.union(
connection._execution_options)
# compiled clauseelement. process bind params, process table defaults,
# track collections used by ResultProxy to target and process results
self.result_map = compiled.result_map
self.result_column_struct = (
compiled._result_columns, compiled._ordered_columns)
self.unicode_statement = util.text_type(compiled)
if not dialect.supports_unicode_statements:
@ -537,11 +544,7 @@ class DefaultExecutionContext(interfaces.ExecutionContext):
self.isinsert = compiled.isinsert
self.isupdate = compiled.isupdate
self.isdelete = compiled.isdelete
if self.isinsert or self.isupdate or self.isdelete:
self._is_explicit_returning = bool(compiled.statement._returning)
self._is_implicit_returning = bool(
compiled.returning and not compiled.statement._returning)
self.is_text = compiled.isplaintext
if not parameters:
self.compiled_parameters = [compiled.construct_params()]
@ -553,11 +556,19 @@ class DefaultExecutionContext(interfaces.ExecutionContext):
self.executemany = len(parameters) > 1
self.cursor = self.create_cursor()
if self.isinsert or self.isupdate:
self.postfetch_cols = self.compiled.postfetch
self.prefetch_cols = self.compiled.prefetch
self.returning_cols = self.compiled.returning
self.__process_defaults()
if self.isinsert or self.isupdate or self.isdelete:
self.is_crud = True
self._is_explicit_returning = bool(compiled.statement._returning)
self._is_implicit_returning = bool(
compiled.returning and not compiled.statement._returning)
if not self.isdelete:
if self.compiled.prefetch:
if self.executemany:
self._process_executemany_defaults()
else:
self._process_executesingle_defaults()
processors = compiled._bind_processors
@ -577,21 +588,28 @@ class DefaultExecutionContext(interfaces.ExecutionContext):
else:
encode = not dialect.supports_unicode_statements
for compiled_params in self.compiled_parameters:
param = {}
if encode:
for key in compiled_params:
if key in processors:
param[dialect._encoder(key)[0]] = \
processors[key](compiled_params[key])
else:
param[dialect._encoder(key)[0]] = \
compiled_params[key]
param = dict(
(
dialect._encoder(key)[0],
processors[key](compiled_params[key])
if key in processors
else compiled_params[key]
)
for key in compiled_params
)
else:
for key in compiled_params:
if key in processors:
param[key] = processors[key](compiled_params[key])
else:
param[key] = compiled_params[key]
param = dict(
(
key,
processors[key](compiled_params[key])
if key in processors
else compiled_params[key]
)
for key in compiled_params
)
parameters.append(param)
self.parameters = dialect.execute_sequence_format(parameters)
@ -603,10 +621,10 @@ class DefaultExecutionContext(interfaces.ExecutionContext):
"""Initialize execution context for a string SQL statement."""
self = cls.__new__(cls)
self.dialect = dialect
self.root_connection = connection
self._dbapi_connection = dbapi_connection
self.engine = connection.engine
self.dialect = connection.dialect
self.is_text = True
# plain text statement
self.execution_options = connection._execution_options
@ -647,21 +665,32 @@ class DefaultExecutionContext(interfaces.ExecutionContext):
"""Initialize execution context for a ColumnDefault construct."""
self = cls.__new__(cls)
self.dialect = dialect
self.root_connection = connection
self._dbapi_connection = dbapi_connection
self.engine = connection.engine
self.dialect = connection.dialect
self.execution_options = connection._execution_options
self.cursor = self.create_cursor()
return self
@util.memoized_property
def no_parameters(self):
return self.execution_options.get("no_parameters", False)
def engine(self):
return self.root_connection.engine
@util.memoized_property
def is_crud(self):
return self.isinsert or self.isupdate or self.isdelete
def postfetch_cols(self):
return self.compiled.postfetch
@util.memoized_property
def prefetch_cols(self):
return self.compiled.prefetch
@util.memoized_property
def returning_cols(self):
self.compiled.returning
@util.memoized_property
def no_parameters(self):
return self.execution_options.get("no_parameters", False)
@util.memoized_property
def should_autocommit(self):
@ -778,16 +807,51 @@ class DefaultExecutionContext(interfaces.ExecutionContext):
def supports_sane_multi_rowcount(self):
return self.dialect.supports_sane_multi_rowcount
def post_insert(self):
if not self._is_implicit_returning and \
not self._is_explicit_returning and \
not self.compiled.inline and \
self.dialect.postfetch_lastrowid and \
(not self.inserted_primary_key or
None in self.inserted_primary_key):
def _setup_crud_result_proxy(self):
if self.isinsert and \
not self.executemany:
if not self._is_implicit_returning and \
not self.compiled.inline and \
self.dialect.postfetch_lastrowid:
table = self.compiled.statement.table
lastrowid = self.get_lastrowid()
self._setup_ins_pk_from_lastrowid()
elif not self._is_implicit_returning:
self._setup_ins_pk_from_empty()
result = self.get_result_proxy()
if self.isinsert:
if self._is_implicit_returning:
row = result.fetchone()
self.returned_defaults = row
self._setup_ins_pk_from_implicit_returning(row)
result._soft_close(_autoclose_connection=False)
result._metadata = None
elif not self._is_explicit_returning:
result._soft_close(_autoclose_connection=False)
result._metadata = None
elif self.isupdate and self._is_implicit_returning:
row = result.fetchone()
self.returned_defaults = row
result._soft_close(_autoclose_connection=False)
result._metadata = None
elif result._metadata is None:
# no results, get rowcount
# (which requires open cursor on some drivers
# such as kintersbasdb, mxodbc)
result.rowcount
result._soft_close(_autoclose_connection=False)
return result
def _setup_ins_pk_from_lastrowid(self):
key_getter = self.compiled._key_getters_for_crud_column[2]
table = self.compiled.statement.table
compiled_params = self.compiled_parameters[0]
lastrowid = self.get_lastrowid()
if lastrowid is not None:
autoinc_col = table._autoincrement_column
if autoinc_col is not None:
# apply type post processors to the lastrowid
@ -795,35 +859,44 @@ class DefaultExecutionContext(interfaces.ExecutionContext):
self.dialect, None)
if proc is not None:
lastrowid = proc(lastrowid)
self.inserted_primary_key = [
lastrowid if c is autoinc_col else v
for c, v in zip(
table.primary_key,
self.inserted_primary_key)
lastrowid if c is autoinc_col else
compiled_params.get(key_getter(c), None)
for c in table.primary_key
]
else:
# don't have a usable lastrowid, so
# do the same as _setup_ins_pk_from_empty
self.inserted_primary_key = [
compiled_params.get(key_getter(c), None)
for c in table.primary_key
]
def _fetch_implicit_returning(self, resultproxy):
def _setup_ins_pk_from_empty(self):
key_getter = self.compiled._key_getters_for_crud_column[2]
table = self.compiled.statement.table
row = resultproxy.fetchone()
compiled_params = self.compiled_parameters[0]
self.inserted_primary_key = [
compiled_params.get(key_getter(c), None)
for c in table.primary_key
]
ipk = []
for c, v in zip(table.primary_key, self.inserted_primary_key):
if v is not None:
ipk.append(v)
else:
ipk.append(row[c])
def _setup_ins_pk_from_implicit_returning(self, row):
key_getter = self.compiled._key_getters_for_crud_column[2]
table = self.compiled.statement.table
compiled_params = self.compiled_parameters[0]
self.inserted_primary_key = ipk
self.returned_defaults = row
def _fetch_implicit_update_returning(self, resultproxy):
row = resultproxy.fetchone()
self.returned_defaults = row
self.inserted_primary_key = [
row[col] if value is None else value
for col, value in [
(col, compiled_params.get(key_getter(col), None))
for col in table.primary_key
]
]
def lastrow_has_defaults(self):
return (self.isinsert or self.isupdate) and \
bool(self.postfetch_cols)
bool(self.compiled.postfetch)
def set_input_sizes(self, translate=None, exclude_types=None):
"""Given a cursor and ClauseParameters, call the appropriate
@ -901,58 +974,53 @@ class DefaultExecutionContext(interfaces.ExecutionContext):
else:
return self._exec_default(column.onupdate, column.type)
def __process_defaults(self):
"""Generate default values for compiled insert/update statements,
and generate inserted_primary_key collection.
"""
def _process_executemany_defaults(self):
key_getter = self.compiled._key_getters_for_crud_column[2]
if self.executemany:
if len(self.compiled.prefetch):
scalar_defaults = {}
prefetch = self.compiled.prefetch
scalar_defaults = {}
# pre-determine scalar Python-side defaults
# to avoid many calls of get_insert_default()/
# get_update_default()
for c in self.prefetch_cols:
if self.isinsert and c.default and c.default.is_scalar:
scalar_defaults[c] = c.default.arg
elif self.isupdate and c.onupdate and c.onupdate.is_scalar:
scalar_defaults[c] = c.onupdate.arg
# pre-determine scalar Python-side defaults
# to avoid many calls of get_insert_default()/
# get_update_default()
for c in prefetch:
if self.isinsert and c.default and c.default.is_scalar:
scalar_defaults[c] = c.default.arg
elif self.isupdate and c.onupdate and c.onupdate.is_scalar:
scalar_defaults[c] = c.onupdate.arg
for param in self.compiled_parameters:
self.current_parameters = param
for c in self.prefetch_cols:
if c in scalar_defaults:
val = scalar_defaults[c]
elif self.isinsert:
val = self.get_insert_default(c)
else:
val = self.get_update_default(c)
if val is not None:
param[key_getter(c)] = val
del self.current_parameters
else:
self.current_parameters = compiled_parameters = \
self.compiled_parameters[0]
for c in self.compiled.prefetch:
if self.isinsert:
for param in self.compiled_parameters:
self.current_parameters = param
for c in prefetch:
if c in scalar_defaults:
val = scalar_defaults[c]
elif self.isinsert:
val = self.get_insert_default(c)
else:
val = self.get_update_default(c)
if val is not None:
compiled_parameters[key_getter(c)] = val
del self.current_parameters
param[key_getter(c)] = val
del self.current_parameters
def _process_executesingle_defaults(self):
key_getter = self.compiled._key_getters_for_crud_column[2]
prefetch = self.compiled.prefetch
self.current_parameters = compiled_parameters = \
self.compiled_parameters[0]
for c in prefetch:
if self.isinsert:
self.inserted_primary_key = [
self.compiled_parameters[0].get(key_getter(c), None)
for c in self.compiled.
statement.table.primary_key
]
if c.default and \
not c.default.is_sequence and c.default.is_scalar:
val = c.default.arg
else:
val = self.get_insert_default(c)
else:
val = self.get_update_default(c)
if val is not None:
compiled_parameters[key_getter(c)] = val
del self.current_parameters
DefaultDialect.execution_ctx_cls = DefaultExecutionContext

176
lib/python3.5/site-packages/sqlalchemy/engine/interfaces.py
View file

@ -1,5 +1,5 @@
# engine/interfaces.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -150,6 +150,16 @@ class Dialect(object):
This will prevent types.Boolean from generating a CHECK
constraint when that type is used.
dbapi_exception_translation_map
A dictionary of names that will contain as values the names of
pep-249 exceptions ("IntegrityError", "OperationalError", etc)
keyed to alternate class names, to support the case where a
DBAPI has exception classes that aren't named as they are
referred to (e.g. IntegrityError = MyException). In the vast
majority of cases this dictionary is empty.
.. versionadded:: 1.0.5
"""
_has_events = False
@ -242,7 +252,9 @@ class Dialect(object):
sequence
a dictionary of the form
{'name' : str, 'start' :int, 'increment': int}
{'name' : str, 'start' :int, 'increment': int, 'minvalue': int,
'maxvalue': int, 'nominvalue': bool, 'nomaxvalue': bool,
'cycle': bool}
Additional column attributes may be present.
"""
@ -308,7 +320,15 @@ class Dialect(object):
def get_table_names(self, connection, schema=None, **kw):
"""Return a list of table names for `schema`."""
raise NotImplementedError
raise NotImplementedError()
def get_temp_table_names(self, connection, schema=None, **kw):
"""Return a list of temporary table names on the given connection,
if supported by the underlying backend.
"""
raise NotImplementedError()
def get_view_names(self, connection, schema=None, **kw):
"""Return a list of all view names available in the database.
@ -319,6 +339,14 @@ class Dialect(object):
raise NotImplementedError()
def get_temp_view_names(self, connection, schema=None, **kw):
"""Return a list of temporary view names on the given connection,
if supported by the underlying backend.
"""
raise NotImplementedError()
def get_view_definition(self, connection, view_name, schema=None, **kw):
"""Return view definition.
@ -638,20 +666,120 @@ class Dialect(object):
return None
def reset_isolation_level(self, dbapi_conn):
"""Given a DBAPI connection, revert its isolation to the default."""
"""Given a DBAPI connection, revert its isolation to the default.
Note that this is a dialect-level method which is used as part
of the implementation of the :class:`.Connection` and
:class:`.Engine`
isolation level facilities; these APIs should be preferred for
most typical use cases.
.. seealso::
:meth:`.Connection.get_isolation_level` - view current level
:attr:`.Connection.default_isolation_level` - view default level
:paramref:`.Connection.execution_options.isolation_level` -
set per :class:`.Connection` isolation level
:paramref:`.create_engine.isolation_level` -
set per :class:`.Engine` isolation level
"""
raise NotImplementedError()
def set_isolation_level(self, dbapi_conn, level):
"""Given a DBAPI connection, set its isolation level."""
"""Given a DBAPI connection, set its isolation level.
Note that this is a dialect-level method which is used as part
of the implementation of the :class:`.Connection` and
:class:`.Engine`
isolation level facilities; these APIs should be preferred for
most typical use cases.
.. seealso::
:meth:`.Connection.get_isolation_level` - view current level
:attr:`.Connection.default_isolation_level` - view default level
:paramref:`.Connection.execution_options.isolation_level` -
set per :class:`.Connection` isolation level
:paramref:`.create_engine.isolation_level` -
set per :class:`.Engine` isolation level
"""
raise NotImplementedError()
def get_isolation_level(self, dbapi_conn):
"""Given a DBAPI connection, return its isolation level."""
"""Given a DBAPI connection, return its isolation level.
When working with a :class:`.Connection` object, the corresponding
DBAPI connection may be procured using the
:attr:`.Connection.connection` accessor.
Note that this is a dialect-level method which is used as part
of the implementation of the :class:`.Connection` and
:class:`.Engine` isolation level facilities;
these APIs should be preferred for most typical use cases.
.. seealso::
:meth:`.Connection.get_isolation_level` - view current level
:attr:`.Connection.default_isolation_level` - view default level
:paramref:`.Connection.execution_options.isolation_level` -
set per :class:`.Connection` isolation level
:paramref:`.create_engine.isolation_level` -
set per :class:`.Engine` isolation level
"""
raise NotImplementedError()
@classmethod
def get_dialect_cls(cls, url):
"""Given a URL, return the :class:`.Dialect` that will be used.
This is a hook that allows an external plugin to provide functionality
around an existing dialect, by allowing the plugin to be loaded
from the url based on an entrypoint, and then the plugin returns
the actual dialect to be used.
By default this just returns the cls.
.. versionadded:: 1.0.3
"""
return cls
@classmethod
def engine_created(cls, engine):
"""A convenience hook called before returning the final :class:`.Engine`.
If the dialect returned a different class from the
:meth:`.get_dialect_cls`
method, then the hook is called on both classes, first on
the dialect class returned by the :meth:`.get_dialect_cls` method and
then on the class on which the method was called.
The hook should be used by dialects and/or wrappers to apply special
events to the engine or its components. In particular, it allows
a dialect-wrapping class to apply dialect-level events.
.. versionadded:: 1.0.3
"""
pass
class ExecutionContext(object):
"""A messenger object for a Dialect that corresponds to a single
@ -901,7 +1029,23 @@ class ExceptionContext(object):
connection = None
"""The :class:`.Connection` in use during the exception.
This member is always present.
This member is present, except in the case of a failure when
first connecting.
.. seealso::
:attr:`.ExceptionContext.engine`
"""
engine = None
"""The :class:`.Engine` in use during the exception.
This member should always be present, even in the case of a failure
when first connecting.
.. versionadded:: 1.0.0
"""
@ -988,3 +1132,21 @@ class ExceptionContext(object):
changing this flag.
"""
invalidate_pool_on_disconnect = True
"""Represent whether all connections in the pool should be invalidated
when a "disconnect" condition is in effect.
Setting this flag to False within the scope of the
:meth:`.ConnectionEvents.handle_error` event will have the effect such
that the full collection of connections in the pool will not be
invalidated during a disconnect; only the current connection that is the
subject of the error will actually be invalidated.
The purpose of this flag is for custom disconnect-handling schemes where
the invalidation of other connections in the pool is to be performed
based on other conditions, or even on a per-connection basis.
.. versionadded:: 1.0.3
"""

301
lib/python3.5/site-packages/sqlalchemy/engine/reflection.py
View file

@ -1,5 +1,5 @@
# engine/reflection.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -173,7 +173,14 @@ class Inspector(object):
passed as ``None``. For special quoting, use :class:`.quoted_name`.
:param order_by: Optional, may be the string "foreign_key" to sort
the result on foreign key dependencies.
the result on foreign key dependencies. Does not automatically
resolve cycles, and will raise :class:`.CircularDependencyError`
if cycles exist.
.. deprecated:: 1.0.0 - see
:meth:`.Inspector.get_sorted_table_and_fkc_names` for a version
of this which resolves foreign key cycles between tables
automatically.
.. versionchanged:: 0.8 the "foreign_key" sorting sorts tables
in order of dependee to dependent; that is, in creation
@ -183,6 +190,8 @@ class Inspector(object):
.. seealso::
:meth:`.Inspector.get_sorted_table_and_fkc_names`
:attr:`.MetaData.sorted_tables`
"""
@ -201,6 +210,88 @@ class Inspector(object):
tnames = list(topological.sort(tuples, tnames))
return tnames
def get_sorted_table_and_fkc_names(self, schema=None):
"""Return dependency-sorted table and foreign key constraint names in
referred to within a particular schema.
This will yield 2-tuples of
``(tablename, [(tname, fkname), (tname, fkname), ...])``
consisting of table names in CREATE order grouped with the foreign key
constraint names that are not detected as belonging to a cycle.
The final element
will be ``(None, [(tname, fkname), (tname, fkname), ..])``
which will consist of remaining
foreign key constraint names that would require a separate CREATE
step after-the-fact, based on dependencies between tables.
.. versionadded:: 1.0.-
.. seealso::
:meth:`.Inspector.get_table_names`
:func:`.sort_tables_and_constraints` - similar method which works
with an already-given :class:`.MetaData`.
"""
if hasattr(self.dialect, 'get_table_names'):
tnames = self.dialect.get_table_names(
self.bind, schema, info_cache=self.info_cache)
else:
tnames = self.engine.table_names(schema)
tuples = set()
remaining_fkcs = set()
fknames_for_table = {}
for tname in tnames:
fkeys = self.get_foreign_keys(tname, schema)
fknames_for_table[tname] = set(
[fk['name'] for fk in fkeys]
)
for fkey in fkeys:
if tname != fkey['referred_table']:
tuples.add((fkey['referred_table'], tname))
try:
candidate_sort = list(topological.sort(tuples, tnames))
except exc.CircularDependencyError as err:
for edge in err.edges:
tuples.remove(edge)
remaining_fkcs.update(
(edge[1], fkc)
for fkc in fknames_for_table[edge[1]]
)
candidate_sort = list(topological.sort(tuples, tnames))
return [
(tname, fknames_for_table[tname].difference(remaining_fkcs))
for tname in candidate_sort
] + [(None, list(remaining_fkcs))]
def get_temp_table_names(self):
"""return a list of temporary table names for the current bind.
This method is unsupported by most dialects; currently
only SQLite implements it.
.. versionadded:: 1.0.0
"""
return self.dialect.get_temp_table_names(
self.bind, info_cache=self.info_cache)
def get_temp_view_names(self):
"""return a list of temporary view names for the current bind.
This method is unsupported by most dialects; currently
only SQLite implements it.
.. versionadded:: 1.0.0
"""
return self.dialect.get_temp_view_names(
self.bind, info_cache=self.info_cache)
def get_table_options(self, table_name, schema=None, **kw):
"""Return a dictionary of options specified when the table of the
given name was created.
@ -370,6 +461,12 @@ class Inspector(object):
unique
boolean
dialect_options
dict of dialect-specific index options. May not be present
for all dialects.
.. versionadded:: 1.0.0
:param table_name: string name of the table. For special quoting,
use :class:`.quoted_name`.
@ -465,55 +562,87 @@ class Inspector(object):
for col_d in self.get_columns(
table_name, schema, **table.dialect_kwargs):
found_table = True
orig_name = col_d['name']
table.dispatch.column_reflect(self, table, col_d)
name = col_d['name']
if include_columns and name not in include_columns:
continue
if exclude_columns and name in exclude_columns:
continue
coltype = col_d['type']
col_kw = dict(
(k, col_d[k])
for k in ['nullable', 'autoincrement', 'quote', 'info', 'key']
if k in col_d
)
colargs = []
if col_d.get('default') is not None:
# the "default" value is assumed to be a literal SQL
# expression, so is wrapped in text() so that no quoting
# occurs on re-issuance.
colargs.append(
sa_schema.DefaultClause(
sql.text(col_d['default']), _reflected=True
)
)
if 'sequence' in col_d:
# TODO: mssql and sybase are using this.
seq = col_d['sequence']
sequence = sa_schema.Sequence(seq['name'], 1, 1)
if 'start' in seq:
sequence.start = seq['start']
if 'increment' in seq:
sequence.increment = seq['increment']
colargs.append(sequence)
cols_by_orig_name[orig_name] = col = \
sa_schema.Column(name, coltype, *colargs, **col_kw)
if col.key in table.primary_key:
col.primary_key = True
table.append_column(col)
self._reflect_column(
table, col_d, include_columns,
exclude_columns, cols_by_orig_name)
if not found_table:
raise exc.NoSuchTableError(table.name)
self._reflect_pk(
table_name, schema, table, cols_by_orig_name, exclude_columns)
self._reflect_fk(
table_name, schema, table, cols_by_orig_name,
exclude_columns, reflection_options)
self._reflect_indexes(
table_name, schema, table, cols_by_orig_name,
include_columns, exclude_columns, reflection_options)
self._reflect_unique_constraints(
table_name, schema, table, cols_by_orig_name,
include_columns, exclude_columns, reflection_options)
def _reflect_column(
self, table, col_d, include_columns,
exclude_columns, cols_by_orig_name):
orig_name = col_d['name']
table.dispatch.column_reflect(self, table, col_d)
# fetch name again as column_reflect is allowed to
# change it
name = col_d['name']
if (include_columns and name not in include_columns) \
or (exclude_columns and name in exclude_columns):
return
coltype = col_d['type']
col_kw = dict(
(k, col_d[k])
for k in ['nullable', 'autoincrement', 'quote', 'info', 'key']
if k in col_d
)
colargs = []
if col_d.get('default') is not None:
# the "default" value is assumed to be a literal SQL
# expression, so is wrapped in text() so that no quoting
# occurs on re-issuance.
colargs.append(
sa_schema.DefaultClause(
sql.text(col_d['default']), _reflected=True
)
)
if 'sequence' in col_d:
self._reflect_col_sequence(col_d, colargs)
cols_by_orig_name[orig_name] = col = \
sa_schema.Column(name, coltype, *colargs, **col_kw)
if col.key in table.primary_key:
col.primary_key = True
table.append_column(col)
def _reflect_col_sequence(self, col_d, colargs):
if 'sequence' in col_d:
# TODO: mssql and sybase are using this.
seq = col_d['sequence']
sequence = sa_schema.Sequence(seq['name'], 1, 1)
if 'start' in seq:
sequence.start = seq['start']
if 'increment' in seq:
sequence.increment = seq['increment']
colargs.append(sequence)
def _reflect_pk(
self, table_name, schema, table,
cols_by_orig_name, exclude_columns):
pk_cons = self.get_pk_constraint(
table_name, schema, **table.dialect_kwargs)
if pk_cons:
@ -530,6 +659,9 @@ class Inspector(object):
# its column collection
table.primary_key._reload(pk_cols)
def _reflect_fk(
self, table_name, schema, table, cols_by_orig_name,
exclude_columns, reflection_options):
fkeys = self.get_foreign_keys(
table_name, schema, **table.dialect_kwargs)
for fkey_d in fkeys:
@ -572,24 +704,85 @@ class Inspector(object):
sa_schema.ForeignKeyConstraint(constrained_columns, refspec,
conname, link_to_name=True,
**options))
def _reflect_indexes(
self, table_name, schema, table, cols_by_orig_name,
include_columns, exclude_columns, reflection_options):
# Indexes
indexes = self.get_indexes(table_name, schema)
for index_d in indexes:
name = index_d['name']
columns = index_d['column_names']
unique = index_d['unique']
flavor = index_d.get('type', 'unknown type')
flavor = index_d.get('type', 'index')
dialect_options = index_d.get('dialect_options', {})
duplicates = index_d.get('duplicates_constraint')
if include_columns and \
not set(columns).issubset(include_columns):
util.warn(
"Omitting %s KEY for (%s), key covers omitted columns." %
"Omitting %s key for (%s), key covers omitted columns." %
(flavor, ', '.join(columns)))
continue
if duplicates:
continue
# look for columns by orig name in cols_by_orig_name,
# but support columns that are in-Python only as fallback
sa_schema.Index(name, *[
cols_by_orig_name[c] if c in cols_by_orig_name
else table.c[c]
for c in columns
],
**dict(unique=unique))
idx_cols = []
for c in columns:
try:
idx_col = cols_by_orig_name[c] \
if c in cols_by_orig_name else table.c[c]
except KeyError:
util.warn(
"%s key '%s' was not located in "
"columns for table '%s'" % (
flavor, c, table_name
))
else:
idx_cols.append(idx_col)
sa_schema.Index(
name, *idx_cols,
**dict(list(dialect_options.items()) + [('unique', unique)])
)
def _reflect_unique_constraints(
self, table_name, schema, table, cols_by_orig_name,
include_columns, exclude_columns, reflection_options):
# Unique Constraints
try:
constraints = self.get_unique_constraints(table_name, schema)
except NotImplementedError:
# optional dialect feature
return
for const_d in constraints:
conname = const_d['name']
columns = const_d['column_names']
duplicates = const_d.get('duplicates_index')
if include_columns and \
not set(columns).issubset(include_columns):
util.warn(
"Omitting unique constraint key for (%s), "
"key covers omitted columns." %
', '.join(columns))
continue
if duplicates:
continue
# look for columns by orig name in cols_by_orig_name,
# but support columns that are in-Python only as fallback
constrained_cols = []
for c in columns:
try:
constrained_col = cols_by_orig_name[c] \
if c in cols_by_orig_name else table.c[c]
except KeyError:
util.warn(
"unique constraint key '%s' was not located in "
"columns for table '%s'" % (c, table_name))
else:
constrained_cols.append(constrained_col)
table.append_constraint(
sa_schema.UniqueConstraint(*constrained_cols, name=conname))

468
lib/python3.5/site-packages/sqlalchemy/engine/result.py
View file

@ -1,5 +1,5 @@
# engine/result.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -110,7 +110,7 @@ class RowProxy(BaseRowProxy):
__slots__ = ()
def __contains__(self, key):
return self._parent._has_key(self._row, key)
return self._parent._has_key(key)
def __getstate__(self):
return {
@ -155,7 +155,7 @@ class RowProxy(BaseRowProxy):
def has_key(self, key):
"""Return True if this RowProxy contains the given key."""
return self._parent._has_key(self._row, key)
return self._parent._has_key(key)
def items(self):
"""Return a list of tuples, each tuple containing a key/value pair."""
@ -187,90 +187,165 @@ class ResultMetaData(object):
context."""
def __init__(self, parent, metadata):
self._processors = processors = []
# We do not strictly need to store the processor in the key mapping,
# though it is faster in the Python version (probably because of the
# saved attribute lookup self._processors)
self._keymap = keymap = {}
self.keys = []
context = parent.context
dialect = context.dialect
typemap = dialect.dbapi_type_map
translate_colname = context._translate_colname
self.case_sensitive = dialect.case_sensitive
self.case_sensitive = case_sensitive = dialect.case_sensitive
# high precedence key values.
primary_keymap = {}
if context.result_column_struct:
result_columns, cols_are_ordered = context.result_column_struct
num_ctx_cols = len(result_columns)
else:
num_ctx_cols = None
for i, rec in enumerate(metadata):
colname = rec[0]
coltype = rec[1]
if num_ctx_cols and \
cols_are_ordered and \
num_ctx_cols == len(metadata):
# case 1 - SQL expression statement, number of columns
# in result matches number of cols in compiled. This is the
# vast majority case for SQL expression constructs. In this
# case we don't bother trying to parse or match up to
# the colnames in the result description.
raw = [
(
idx,
key,
name.lower() if not case_sensitive else name,
context.get_result_processor(
type_, key, metadata[idx][1]
),
obj,
None
) for idx, (key, name, obj, type_)
in enumerate(result_columns)
]
self.keys = [
elem[0] for elem in result_columns
]
else:
# case 2 - raw string, or number of columns in result does
# not match number of cols in compiled. The raw string case
# is very common. The latter can happen
# when text() is used with only a partial typemap, or
# in the extremely unlikely cases where the compiled construct
# has a single element with multiple col expressions in it
# (e.g. has commas embedded) or there's some kind of statement
# that is adding extra columns.
# In all these cases we fall back to the "named" approach
# that SQLAlchemy has used up through 0.9.
if dialect.description_encoding:
colname = dialect._description_decoder(colname)
if num_ctx_cols:
result_map = self._create_result_map(
result_columns, case_sensitive)
raw = []
self.keys = []
untranslated = None
for idx, rec in enumerate(metadata):
colname = rec[0]
coltype = rec[1]
if dialect.description_encoding:
colname = dialect._description_decoder(colname)
if translate_colname:
colname, untranslated = translate_colname(colname)
if dialect.requires_name_normalize:
colname = dialect.normalize_name(colname)
self.keys.append(colname)
if not case_sensitive:
colname = colname.lower()
if num_ctx_cols:
try:
ctx_rec = result_map[colname]
except KeyError:
mapped_type = typemap.get(coltype, sqltypes.NULLTYPE)
obj = None
else:
obj = ctx_rec[1]
mapped_type = ctx_rec[2]
else:
mapped_type = typemap.get(coltype, sqltypes.NULLTYPE)
obj = None
processor = context.get_result_processor(
mapped_type, colname, coltype)
raw.append(
(idx, colname, colname, processor, obj, untranslated)
)
# keymap indexes by integer index...
self._keymap = dict([
(elem[0], (elem[3], elem[4], elem[0]))
for elem in raw
])
# processors in key order for certain per-row
# views like __iter__ and slices
self._processors = [elem[3] for elem in raw]
if num_ctx_cols:
# keymap by primary string...
by_key = dict([
(elem[2], (elem[3], elem[4], elem[0]))
for elem in raw
])
# if by-primary-string dictionary smaller (or bigger?!) than
# number of columns, assume we have dupes, rewrite
# dupe records with "None" for index which results in
# ambiguous column exception when accessed.
if len(by_key) != num_ctx_cols:
seen = set()
for rec in raw:
key = rec[1]
if key in seen:
by_key[key] = (None, by_key[key][1], None)
seen.add(key)
# update keymap with secondary "object"-based keys
self._keymap.update([
(obj_elem, by_key[elem[2]])
for elem in raw if elem[4]
for obj_elem in elem[4]
])
# update keymap with primary string names taking
# precedence
self._keymap.update(by_key)
else:
self._keymap.update([
(elem[2], (elem[3], elem[4], elem[0]))
for elem in raw
])
# update keymap with "translated" names (sqlite-only thing)
if translate_colname:
colname, untranslated = translate_colname(colname)
self._keymap.update([
(elem[5], self._keymap[elem[2]])
for elem in raw if elem[5]
])
if dialect.requires_name_normalize:
colname = dialect.normalize_name(colname)
if context.result_map:
try:
name, obj, type_ = context.result_map[
colname if self.case_sensitive else colname.lower()]
except KeyError:
name, obj, type_ = \
colname, None, typemap.get(coltype, sqltypes.NULLTYPE)
@classmethod
def _create_result_map(cls, result_columns, case_sensitive=True):
d = {}
for elem in result_columns:
key, rec = elem[0], elem[1:]
if not case_sensitive:
key = key.lower()
if key in d:
# conflicting keyname, just double up the list
# of objects. this will cause an "ambiguous name"
# error if an attempt is made by the result set to
# access.
e_name, e_obj, e_type = d[key]
d[key] = e_name, e_obj + rec[1], e_type
else:
name, obj, type_ = \
colname, None, typemap.get(coltype, sqltypes.NULLTYPE)
processor = context.get_result_processor(type_, colname, coltype)
processors.append(processor)
rec = (processor, obj, i)
# indexes as keys. This is only needed for the Python version of
# RowProxy (the C version uses a faster path for integer indexes).
primary_keymap[i] = rec
# populate primary keymap, looking for conflicts.
if primary_keymap.setdefault(
name if self.case_sensitive
else name.lower(),
rec) is not rec:
# place a record that doesn't have the "index" - this
# is interpreted later as an AmbiguousColumnError,
# but only when actually accessed. Columns
# colliding by name is not a problem if those names
# aren't used; integer access is always
# unambiguous.
primary_keymap[name
if self.case_sensitive
else name.lower()] = rec = (None, obj, None)
self.keys.append(colname)
if obj:
for o in obj:
keymap[o] = rec
# technically we should be doing this but we
# are saving on callcounts by not doing so.
# if keymap.setdefault(o, rec) is not rec:
# keymap[o] = (None, obj, None)
if translate_colname and \
untranslated:
keymap[untranslated] = rec
# overwrite keymap values with those of the
# high precedence keymap.
keymap.update(primary_keymap)
if parent._echo:
context.engine.logger.debug(
"Col %r", tuple(x[0] for x in metadata))
d[key] = rec
return d
@util.pending_deprecation("0.8", "sqlite dialect uses "
"_translate_colname() now")
@ -335,12 +410,28 @@ class ResultMetaData(object):
map[key] = result
return result
def _has_key(self, row, key):
def _has_key(self, key):
if key in self._keymap:
return True
else:
return self._key_fallback(key, False) is not None
def _getter(self, key):
if key in self._keymap:
processor, obj, index = self._keymap[key]
else:
ret = self._key_fallback(key, False)
if ret is None:
return None
processor, obj, index = ret
if index is None:
raise exc.InvalidRequestError(
"Ambiguous column name '%s' in result set! "
"try 'use_labels' option on select statement." % key)
return operator.itemgetter(index)
def __getstate__(self):
return {
'_pickled_keymap': dict(
@ -391,21 +482,49 @@ class ResultProxy(object):
out_parameters = None
_can_close_connection = False
_metadata = None
_soft_closed = False
closed = False
def __init__(self, context):
self.context = context
self.dialect = context.dialect
self.closed = False
self.cursor = self._saved_cursor = context.cursor
self.connection = context.root_connection
self._echo = self.connection._echo and \
context.engine._should_log_debug()
self._init_metadata()
def _getter(self, key):
try:
getter = self._metadata._getter
except AttributeError:
return self._non_result(None)
else:
return getter(key)
def _has_key(self, key):
try:
has_key = self._metadata._has_key
except AttributeError:
return self._non_result(None)
else:
return has_key(key)
def _init_metadata(self):
metadata = self._cursor_description()
if metadata is not None:
self._metadata = ResultMetaData(self, metadata)
if self.context.compiled and \
'compiled_cache' in self.context.execution_options:
if self.context.compiled._cached_metadata:
self._metadata = self.context.compiled._cached_metadata
else:
self._metadata = self.context.compiled._cached_metadata = \
ResultMetaData(self, metadata)
else:
self._metadata = ResultMetaData(self, metadata)
if self._echo:
self.context.engine.logger.debug(
"Col %r", tuple(x[0] for x in metadata))
def keys(self):
"""Return the current set of string keys for rows."""
@ -515,39 +634,85 @@ class ResultProxy(object):
return self._saved_cursor.description
def close(self, _autoclose_connection=True):
"""Close this ResultProxy.
def _soft_close(self, _autoclose_connection=True):
"""Soft close this :class:`.ResultProxy`.
Closes the underlying DBAPI cursor corresponding to the execution.
Note that any data cached within this ResultProxy is still available.
For some types of results, this may include buffered rows.
If this ResultProxy was generated from an implicit execution,
the underlying Connection will also be closed (returns the
underlying DBAPI connection to the connection pool.)
This releases all DBAPI cursor resources, but leaves the
ResultProxy "open" from a semantic perspective, meaning the
fetchXXX() methods will continue to return empty results.
This method is called automatically when:
* all result rows are exhausted using the fetchXXX() methods.
* cursor.description is None.
This method is **not public**, but is documented in order to clarify
the "autoclose" process used.
.. versionadded:: 1.0.0
.. seealso::
:meth:`.ResultProxy.close`
"""
if self._soft_closed:
return
self._soft_closed = True
cursor = self.cursor
self.connection._safe_close_cursor(cursor)
if _autoclose_connection and \
self.connection.should_close_with_result:
self.connection.close()
self.cursor = None
def close(self):
"""Close this ResultProxy.
This closes out the underlying DBAPI cursor corresonding
to the statement execution, if one is stil present. Note that the
DBAPI cursor is automatically released when the :class:`.ResultProxy`
exhausts all available rows. :meth:`.ResultProxy.close` is generally
an optional method except in the case when discarding a
:class:`.ResultProxy` that still has additional rows pending for fetch.
In the case of a result that is the product of
:ref:`connectionless execution <dbengine_implicit>`,
the underyling :class:`.Connection` object is also closed, which
:term:`releases` DBAPI connection resources.
After this method is called, it is no longer valid to call upon
the fetch methods, which will raise a :class:`.ResourceClosedError`
on subsequent use.
.. versionchanged:: 1.0.0 - the :meth:`.ResultProxy.close` method
has been separated out from the process that releases the underlying
DBAPI cursor resource. The "auto close" feature of the
:class:`.Connection` now performs a so-called "soft close", which
releases the underlying DBAPI cursor, but allows the
:class:`.ResultProxy` to still behave as an open-but-exhausted
result set; the actual :meth:`.ResultProxy.close` method is never
called. It is still safe to discard a :class:`.ResultProxy`
that has been fully exhausted without calling this method.
.. seealso::
:ref:`connections_toplevel`
:meth:`.ResultProxy._soft_close`
"""
if not self.closed:
self._soft_close()
self.closed = True
self.connection._safe_close_cursor(self.cursor)
if _autoclose_connection and \
self.connection.should_close_with_result:
self.connection.close()
# allow consistent errors
self.cursor = None
def __iter__(self):
while True:
row = self.fetchone()
if row is None:
raise StopIteration
return
else:
yield row
@ -732,7 +897,7 @@ class ResultProxy(object):
try:
return self.cursor.fetchone()
except AttributeError:
self._non_result()
return self._non_result(None)
def _fetchmany_impl(self, size=None):
try:
@ -741,22 +906,24 @@ class ResultProxy(object):
else:
return self.cursor.fetchmany(size)
except AttributeError:
self._non_result()
return self._non_result([])
def _fetchall_impl(self):
try:
return self.cursor.fetchall()
except AttributeError:
self._non_result()
return self._non_result([])
def _non_result(self):
def _non_result(self, default):
if self._metadata is None:
raise exc.ResourceClosedError(
"This result object does not return rows. "
"It has been closed automatically.",
)
else:
elif self.closed:
raise exc.ResourceClosedError("This result object is closed.")
else:
return default
def process_rows(self, rows):
process_row = self._process_row
@ -775,11 +942,25 @@ class ResultProxy(object):
for row in rows]
def fetchall(self):
"""Fetch all rows, just like DB-API ``cursor.fetchall()``."""
"""Fetch all rows, just like DB-API ``cursor.fetchall()``.
After all rows have been exhausted, the underlying DBAPI
cursor resource is released, and the object may be safely
discarded.
Subsequent calls to :meth:`.ResultProxy.fetchall` will return
an empty list. After the :meth:`.ResultProxy.close` method is
called, the method will raise :class:`.ResourceClosedError`.
.. versionchanged:: 1.0.0 - Added "soft close" behavior which
allows the result to be used in an "exhausted" state prior to
calling the :meth:`.ResultProxy.close` method.
"""
try:
l = self.process_rows(self._fetchall_impl())
self.close()
self._soft_close()
return l
except Exception as e:
self.connection._handle_dbapi_exception(
@ -790,15 +971,25 @@ class ResultProxy(object):
"""Fetch many rows, just like DB-API
``cursor.fetchmany(size=cursor.arraysize)``.
If rows are present, the cursor remains open after this is called.
Else the cursor is automatically closed and an empty list is returned.
After all rows have been exhausted, the underlying DBAPI
cursor resource is released, and the object may be safely
discarded.
Calls to :meth:`.ResultProxy.fetchmany` after all rows have been
exhuasted will return
an empty list. After the :meth:`.ResultProxy.close` method is
called, the method will raise :class:`.ResourceClosedError`.
.. versionchanged:: 1.0.0 - Added "soft close" behavior which
allows the result to be used in an "exhausted" state prior to
calling the :meth:`.ResultProxy.close` method.
"""
try:
l = self.process_rows(self._fetchmany_impl(size))
if len(l) == 0:
self.close()
self._soft_close()
return l
except Exception as e:
self.connection._handle_dbapi_exception(
@ -808,8 +999,18 @@ class ResultProxy(object):
def fetchone(self):
"""Fetch one row, just like DB-API ``cursor.fetchone()``.
If a row is present, the cursor remains open after this is called.
Else the cursor is automatically closed and None is returned.
After all rows have been exhausted, the underlying DBAPI
cursor resource is released, and the object may be safely
discarded.
Calls to :meth:`.ResultProxy.fetchone` after all rows have
been exhausted will return ``None``.
After the :meth:`.ResultProxy.close` method is
called, the method will raise :class:`.ResourceClosedError`.
.. versionchanged:: 1.0.0 - Added "soft close" behavior which
allows the result to be used in an "exhausted" state prior to
calling the :meth:`.ResultProxy.close` method.
"""
try:
@ -817,7 +1018,7 @@ class ResultProxy(object):
if row is not None:
return self.process_rows([row])[0]
else:
self.close()
self._soft_close()
return None
except Exception as e:
self.connection._handle_dbapi_exception(
@ -829,9 +1030,12 @@ class ResultProxy(object):
Returns None if no row is present.
After calling this method, the object is fully closed,
e.g. the :meth:`.ResultProxy.close` method will have been called.
"""
if self._metadata is None:
self._non_result()
return self._non_result(None)
try:
row = self._fetchone_impl()
@ -853,6 +1057,9 @@ class ResultProxy(object):
Returns None if no row is present.
After calling this method, the object is fully closed,
e.g. the :meth:`.ResultProxy.close` method will have been called.
"""
row = self.first()
if row is not None:
@ -873,10 +1080,27 @@ class BufferedRowResultProxy(ResultProxy):
The pre-fetching behavior fetches only one row initially, and then
grows its buffer size by a fixed amount with each successive need
for additional rows up to a size of 100.
for additional rows up to a size of 1000.
The size argument is configurable using the ``max_row_buffer``
execution option::
with psycopg2_engine.connect() as conn:
result = conn.execution_options(
stream_results=True, max_row_buffer=50
).execute("select * from table")
.. versionadded:: 1.0.6 Added the ``max_row_buffer`` option.
.. seealso::
:ref:`psycopg2_execution_options`
"""
def _init_metadata(self):
self._max_row_buffer = self.context.execution_options.get(
'max_row_buffer', None)
self.__buffer_rows()
super(BufferedRowResultProxy, self)._init_metadata()
@ -896,13 +1120,21 @@ class BufferedRowResultProxy(ResultProxy):
}
def __buffer_rows(self):
if self.cursor is None:
return
size = getattr(self, '_bufsize', 1)
self.__rowbuffer = collections.deque(self.cursor.fetchmany(size))
self._bufsize = self.size_growth.get(size, size)
if self._max_row_buffer is not None:
self._bufsize = min(self._max_row_buffer, self._bufsize)
def _soft_close(self, **kw):
self.__rowbuffer.clear()
super(BufferedRowResultProxy, self)._soft_close(**kw)
def _fetchone_impl(self):
if self.closed:
return None
if self.cursor is None:
return self._non_result(None)
if not self.__rowbuffer:
self.__buffer_rows()
if not self.__rowbuffer:
@ -921,6 +1153,8 @@ class BufferedRowResultProxy(ResultProxy):
return result
def _fetchall_impl(self):
if self.cursor is None:
return self._non_result([])
self.__rowbuffer.extend(self.cursor.fetchall())
ret = self.__rowbuffer
self.__rowbuffer = collections.deque()
@ -943,11 +1177,15 @@ class FullyBufferedResultProxy(ResultProxy):
def _buffer_rows(self):
return collections.deque(self.cursor.fetchall())
def _soft_close(self, **kw):
self.__rowbuffer.clear()
super(FullyBufferedResultProxy, self)._soft_close(**kw)
def _fetchone_impl(self):
if self.__rowbuffer:
return self.__rowbuffer.popleft()
else:
return None
return self._non_result(None)
def _fetchmany_impl(self, size=None):
if size is None:
@ -961,6 +1199,8 @@ class FullyBufferedResultProxy(ResultProxy):
return result
def _fetchall_impl(self):
if not self.cursor:
return self._non_result([])
ret = self.__rowbuffer
self.__rowbuffer = collections.deque()
return ret

30
lib/python3.5/site-packages/sqlalchemy/engine/strategies.py
View file

@ -1,5 +1,5 @@
# engine/strategies.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -48,7 +48,8 @@ class DefaultEngineStrategy(EngineStrategy):
# create url.URL object
u = url.make_url(name_or_url)
dialect_cls = u.get_dialect()
entrypoint = u._get_entrypoint()
dialect_cls = entrypoint.get_dialect_cls(u)
if kwargs.pop('_coerce_config', False):
def pop_kwarg(key, default=None):
@ -81,21 +82,19 @@ class DefaultEngineStrategy(EngineStrategy):
# assemble connection arguments
(cargs, cparams) = dialect.create_connect_args(u)
cparams.update(pop_kwarg('connect_args', {}))
cargs = list(cargs) # allow mutability
# look for existing pool or create
pool = pop_kwarg('pool', None)
if pool is None:
def connect():
try:
return dialect.connect(*cargs, **cparams)
except dialect.dbapi.Error as e:
invalidated = dialect.is_disconnect(e, None, None)
util.raise_from_cause(
exc.DBAPIError.instance(
None, None, e, dialect.dbapi.Error,
connection_invalidated=invalidated
)
)
def connect(connection_record=None):
if dialect._has_events:
for fn in dialect.dispatch.do_connect:
connection = fn(
dialect, connection_record, cargs, cparams)
if connection is not None:
return connection
return dialect.connect(*cargs, **cparams)
creator = pop_kwarg('creator', connect)
@ -162,9 +161,14 @@ class DefaultEngineStrategy(EngineStrategy):
def first_connect(dbapi_connection, connection_record):
c = base.Connection(engine, connection=dbapi_connection,
_has_events=False)
c._execution_options = util.immutabledict()
dialect.initialize(c)
event.listen(pool, 'first_connect', first_connect, once=True)
dialect_cls.engine_created(engine)
if entrypoint is not dialect_cls:
entrypoint.engine_created(engine)
return engine

7
lib/python3.5/site-packages/sqlalchemy/engine/threadlocal.py
View file

@ -1,5 +1,5 @@
# engine/threadlocal.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -59,7 +59,10 @@ class TLEngine(base.Engine):
# guards against pool-level reapers, if desired.
# or not connection.connection.is_valid:
connection = self._tl_connection_cls(
self, self.pool.connect(), **kw)
self,
self._wrap_pool_connect(
self.pool.connect, connection),
**kw)
self._connections.conn = weakref.ref(connection)
return connection._increment_connect()

32
lib/python3.5/site-packages/sqlalchemy/engine/url.py
View file

@ -1,5 +1,5 @@
# engine/url.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -105,11 +105,25 @@ class URL(object):
self.database == other.database and \
self.query == other.query
def get_dialect(self):
"""Return the SQLAlchemy database dialect class corresponding
to this URL's driver name.
"""
def get_backend_name(self):
if '+' not in self.drivername:
return self.drivername
else:
return self.drivername.split('+')[0]
def get_driver_name(self):
if '+' not in self.drivername:
return self.get_dialect().driver
else:
return self.drivername.split('+')[1]
def _get_entrypoint(self):
"""Return the "entry point" dialect class.
This is normally the dialect itself except in the case when the
returned class implements the get_dialect_cls() method.
"""
if '+' not in self.drivername:
name = self.drivername
else:
@ -125,6 +139,14 @@ class URL(object):
else:
return cls
def get_dialect(self):
"""Return the SQLAlchemy database dialect class corresponding
to this URL's driver name.
"""
entrypoint = self._get_entrypoint()
dialect_cls = entrypoint.get_dialect_cls(self)
return dialect_cls
def translate_connect_args(self, names=[], **kw):
"""Translate url attributes into a dictionary of connection arguments.

2
lib/python3.5/site-packages/sqlalchemy/engine/util.py
View file

@ -1,5 +1,5 @@
# engine/util.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under

2
lib/python3.5/site-packages/sqlalchemy/event/__init__.py
View file

@ -1,5 +1,5 @@
# event/__init__.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under

56
lib/python3.5/site-packages/sqlalchemy/event/api.py
View file

@ -1,5 +1,5 @@
# event/api.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -58,6 +58,32 @@ def listen(target, identifier, fn, *args, **kw):
.. versionadded:: 0.9.4 Added ``once=True`` to :func:`.event.listen`
and :func:`.event.listens_for`.
.. note::
The :func:`.listen` function cannot be called at the same time
that the target event is being run. This has implications
for thread safety, and also means an event cannot be added
from inside the listener function for itself. The list of
events to be run are present inside of a mutable collection
that can't be changed during iteration.
Event registration and removal is not intended to be a "high
velocity" operation; it is a configurational operation. For
systems that need to quickly associate and deassociate with
events at high scale, use a mutable structure that is handled
from inside of a single listener.
.. versionchanged:: 1.0.0 - a ``collections.deque()`` object is now
used as the container for the list of events, which explicitly
disallows collection mutation while the collection is being
iterated.
.. seealso::
:func:`.listens_for`
:func:`.remove`
"""
_event_key(target, identifier, fn).listen(*args, **kw)
@ -89,6 +115,10 @@ def listens_for(target, identifier, *args, **kw):
.. versionadded:: 0.9.4 Added ``once=True`` to :func:`.event.listen`
and :func:`.event.listens_for`.
.. seealso::
:func:`.listen` - general description of event listening
"""
def decorate(fn):
listen(target, identifier, fn, *args, **kw)
@ -120,6 +150,30 @@ def remove(target, identifier, fn):
.. versionadded:: 0.9.0
.. note::
The :func:`.remove` function cannot be called at the same time
that the target event is being run. This has implications
for thread safety, and also means an event cannot be removed
from inside the listener function for itself. The list of
events to be run are present inside of a mutable collection
that can't be changed during iteration.
Event registration and removal is not intended to be a "high
velocity" operation; it is a configurational operation. For
systems that need to quickly associate and deassociate with
events at high scale, use a mutable structure that is handled
from inside of a single listener.
.. versionchanged:: 1.0.0 - a ``collections.deque()`` object is now
used as the container for the list of events, which explicitly
disallows collection mutation while the collection is being
iterated.
.. seealso::
:func:`.listen`
"""
_event_key(target, identifier, fn).remove()

119
lib/python3.5/site-packages/sqlalchemy/event/attr.py
View file

@ -1,5 +1,5 @@
# event/attr.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -37,19 +37,24 @@ from . import registry
from . import legacy
from itertools import chain
import weakref
import collections
class RefCollection(object):
@util.memoized_property
def ref(self):
class RefCollection(util.MemoizedSlots):
__slots__ = 'ref',
def _memoized_attr_ref(self):
return weakref.ref(self, registry._collection_gced)
class _DispatchDescriptor(RefCollection):
"""Class-level attributes on :class:`._Dispatch` classes."""
class _ClsLevelDispatch(RefCollection):
"""Class-level events on :class:`._Dispatch` classes."""
__slots__ = ('name', 'arg_names', 'has_kw',
'legacy_signatures', '_clslevel', '__weakref__')
def __init__(self, parent_dispatch_cls, fn):
self.__name__ = fn.__name__
self.name = fn.__name__
argspec = util.inspect_getargspec(fn)
self.arg_names = argspec.args[1:]
self.has_kw = bool(argspec.keywords)
@ -59,11 +64,9 @@ class _DispatchDescriptor(RefCollection):
key=lambda s: s[0]
)
))
self.__doc__ = fn.__doc__ = legacy._augment_fn_docs(
self, parent_dispatch_cls, fn)
fn.__doc__ = legacy._augment_fn_docs(self, parent_dispatch_cls, fn)
self._clslevel = weakref.WeakKeyDictionary()
self._empty_listeners = weakref.WeakKeyDictionary()
def _adjust_fn_spec(self, fn, named):
if named:
@ -96,8 +99,8 @@ class _DispatchDescriptor(RefCollection):
self.update_subclass(cls)
else:
if cls not in self._clslevel:
self._clslevel[cls] = []
self._clslevel[cls].insert(0, event_key._listen_fn)
self._clslevel[cls] = collections.deque()
self._clslevel[cls].appendleft(event_key._listen_fn)
registry._stored_in_collection(event_key, self)
def append(self, event_key, propagate):
@ -113,13 +116,13 @@ class _DispatchDescriptor(RefCollection):
self.update_subclass(cls)
else:
if cls not in self._clslevel:
self._clslevel[cls] = []
self._clslevel[cls] = collections.deque()
self._clslevel[cls].append(event_key._listen_fn)
registry._stored_in_collection(event_key, self)
def update_subclass(self, target):
if target not in self._clslevel:
self._clslevel[target] = []
self._clslevel[target] = collections.deque()
clslevel = self._clslevel[target]
for cls in target.__mro__[1:]:
if cls in self._clslevel:
@ -145,40 +148,29 @@ class _DispatchDescriptor(RefCollection):
to_clear = set()
for dispatcher in self._clslevel.values():
to_clear.update(dispatcher)
dispatcher[:] = []
dispatcher.clear()
registry._clear(self, to_clear)
def for_modify(self, obj):
"""Return an event collection which can be modified.
For _DispatchDescriptor at the class level of
For _ClsLevelDispatch at the class level of
a dispatcher, this returns self.
"""
return self
def __get__(self, obj, cls):
if obj is None:
return self
elif obj._parent_cls in self._empty_listeners:
ret = self._empty_listeners[obj._parent_cls]
else:
self._empty_listeners[obj._parent_cls] = ret = \
_EmptyListener(self, obj._parent_cls)
# assigning it to __dict__ means
# memoized for fast re-access. but more memory.
obj.__dict__[self.__name__] = ret
return ret
class _InstanceLevelDispatch(RefCollection):
__slots__ = ()
class _HasParentDispatchDescriptor(object):
def _adjust_fn_spec(self, fn, named):
return self.parent._adjust_fn_spec(fn, named)
class _EmptyListener(_HasParentDispatchDescriptor):
"""Serves as a class-level interface to the events
served by a _DispatchDescriptor, when there are no
class _EmptyListener(_InstanceLevelDispatch):
"""Serves as a proxy interface to the events
served by a _ClsLevelDispatch, when there are no
instance-level events present.
Is replaced by _ListenerCollection when instance-level
@ -186,14 +178,17 @@ class _EmptyListener(_HasParentDispatchDescriptor):
"""
propagate = frozenset()
listeners = ()
__slots__ = 'parent', 'parent_listeners', 'name'
def __init__(self, parent, target_cls):
if target_cls not in parent._clslevel:
parent.update_subclass(target_cls)
self.parent = parent # _DispatchDescriptor
self.parent = parent # _ClsLevelDispatch
self.parent_listeners = parent._clslevel[target_cls]
self.name = parent.__name__
self.propagate = frozenset()
self.listeners = ()
self.name = parent.name
def for_modify(self, obj):
"""Return an event collection which can be modified.
@ -204,9 +199,11 @@ class _EmptyListener(_HasParentDispatchDescriptor):
and returns it.
"""
result = _ListenerCollection(self.parent, obj._parent_cls)
if obj.__dict__[self.name] is self:
obj.__dict__[self.name] = result
result = _ListenerCollection(self.parent, obj._instance_cls)
if getattr(obj, self.name) is self:
setattr(obj, self.name, result)
else:
assert isinstance(getattr(obj, self.name), _JoinedListener)
return result
def _needs_modify(self, *args, **kw):
@ -232,11 +229,10 @@ class _EmptyListener(_HasParentDispatchDescriptor):
__nonzero__ = __bool__
class _CompoundListener(_HasParentDispatchDescriptor):
_exec_once = False
class _CompoundListener(_InstanceLevelDispatch):
__slots__ = '_exec_once_mutex', '_exec_once'
@util.memoized_property
def _exec_once_mutex(self):
def _memoized_attr__exec_once_mutex(self):
return threading.Lock()
def exec_once(self, *args, **kw):
@ -271,7 +267,7 @@ class _CompoundListener(_HasParentDispatchDescriptor):
__nonzero__ = __bool__
class _ListenerCollection(RefCollection, _CompoundListener):
class _ListenerCollection(_CompoundListener):
"""Instance-level attributes on instances of :class:`._Dispatch`.
Represents a collection of listeners.
@ -281,13 +277,18 @@ class _ListenerCollection(RefCollection, _CompoundListener):
"""
__slots__ = (
'parent_listeners', 'parent', 'name', 'listeners',
'propagate', '__weakref__')
def __init__(self, parent, target_cls):
if target_cls not in parent._clslevel:
parent.update_subclass(target_cls)
self._exec_once = False
self.parent_listeners = parent._clslevel[target_cls]
self.parent = parent
self.name = parent.__name__
self.listeners = []
self.name = parent.name
self.listeners = collections.deque()
self.propagate = set()
def for_modify(self, obj):
@ -318,14 +319,12 @@ class _ListenerCollection(RefCollection, _CompoundListener):
registry._stored_in_collection_multi(self, other, to_associate)
def insert(self, event_key, propagate):
if event_key._listen_fn not in self.listeners:
event_key.prepend_to_list(self, self.listeners)
if event_key.prepend_to_list(self, self.listeners):
if propagate:
self.propagate.add(event_key._listen_fn)
def append(self, event_key, propagate):
if event_key._listen_fn not in self.listeners:
event_key.append_to_list(self, self.listeners)
if event_key.append_to_list(self, self.listeners):
if propagate:
self.propagate.add(event_key._listen_fn)
@ -337,28 +336,14 @@ class _ListenerCollection(RefCollection, _CompoundListener):
def clear(self):
registry._clear(self, self.listeners)
self.propagate.clear()
self.listeners[:] = []
class _JoinedDispatchDescriptor(object):
def __init__(self, name):
self.name = name
def __get__(self, obj, cls):
if obj is None:
return self
else:
obj.__dict__[self.name] = ret = _JoinedListener(
obj.parent, self.name,
getattr(obj.local, self.name)
)
return ret
self.listeners.clear()
class _JoinedListener(_CompoundListener):
_exec_once = False
__slots__ = 'parent', 'name', 'local', 'parent_listeners'
def __init__(self, parent, name, local):
self._exec_once = False
self.parent = parent
self.name = name
self.local = local

163
lib/python3.5/site-packages/sqlalchemy/event/base.py
View file

@ -1,5 +1,5 @@
# event/base.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -17,9 +17,11 @@ instances of ``_Dispatch``.
"""
from __future__ import absolute_import
import weakref
from .. import util
from .attr import _JoinedDispatchDescriptor, \
_EmptyListener, _DispatchDescriptor
from .attr import _JoinedListener, \
_EmptyListener, _ClsLevelDispatch
_registrars = util.defaultdict(list)
@ -34,10 +36,11 @@ class _UnpickleDispatch(object):
"""
def __call__(self, _parent_cls):
for cls in _parent_cls.__mro__:
def __call__(self, _instance_cls):
for cls in _instance_cls.__mro__:
if 'dispatch' in cls.__dict__:
return cls.__dict__['dispatch'].dispatch_cls(_parent_cls)
return cls.__dict__['dispatch'].\
dispatch_cls._for_class(_instance_cls)
else:
raise AttributeError("No class with a 'dispatch' member present.")
@ -62,16 +65,53 @@ class _Dispatch(object):
"""
_events = None
"""reference the :class:`.Events` class which this
:class:`._Dispatch` is created for."""
# in one ORM edge case, an attribute is added to _Dispatch,
# so __dict__ is used in just that case and potentially others.
__slots__ = '_parent', '_instance_cls', '__dict__', '_empty_listeners'
def __init__(self, _parent_cls):
self._parent_cls = _parent_cls
_empty_listener_reg = weakref.WeakKeyDictionary()
@util.classproperty
def _listen(cls):
return cls._events._listen
def __init__(self, parent, instance_cls=None):
self._parent = parent
self._instance_cls = instance_cls
if instance_cls:
try:
self._empty_listeners = self._empty_listener_reg[instance_cls]
except KeyError:
self._empty_listeners = \
self._empty_listener_reg[instance_cls] = dict(
(ls.name, _EmptyListener(ls, instance_cls))
for ls in parent._event_descriptors
)
else:
self._empty_listeners = {}
def __getattr__(self, name):
# assign EmptyListeners as attributes on demand
# to reduce startup time for new dispatch objects
try:
ls = self._empty_listeners[name]
except KeyError:
raise AttributeError(name)
else:
setattr(self, ls.name, ls)
return ls
@property
def _event_descriptors(self):
for k in self._event_names:
yield getattr(self, k)
def _for_class(self, instance_cls):
return self.__class__(self, instance_cls)
def _for_instance(self, instance):
instance_cls = instance.__class__
return self._for_class(instance_cls)
@property
def _listen(self):
return self._events._listen
def _join(self, other):
"""Create a 'join' of this :class:`._Dispatch` and another.
@ -83,36 +123,27 @@ class _Dispatch(object):
if '_joined_dispatch_cls' not in self.__class__.__dict__:
cls = type(
"Joined%s" % self.__class__.__name__,
(_JoinedDispatcher, self.__class__), {}
(_JoinedDispatcher, ), {'__slots__': self._event_names}
)
for ls in _event_descriptors(self):
setattr(cls, ls.name, _JoinedDispatchDescriptor(ls.name))
self.__class__._joined_dispatch_cls = cls
return self._joined_dispatch_cls(self, other)
def __reduce__(self):
return _UnpickleDispatch(), (self._parent_cls, )
return _UnpickleDispatch(), (self._instance_cls, )
def _update(self, other, only_propagate=True):
"""Populate from the listeners in another :class:`_Dispatch`
object."""
for ls in _event_descriptors(other):
for ls in other._event_descriptors:
if isinstance(ls, _EmptyListener):
continue
getattr(self, ls.name).\
for_modify(self)._update(ls, only_propagate=only_propagate)
@util.hybridmethod
def _clear(self):
for attr in dir(self):
if _is_event_name(attr):
getattr(self, attr).for_modify(self).clear()
def _event_descriptors(target):
return [getattr(target, k) for k in dir(target) if _is_event_name(k)]
for ls in self._event_descriptors:
ls.for_modify(self).clear()
class _EventMeta(type):
@ -131,26 +162,37 @@ def _create_dispatcher_class(cls, classname, bases, dict_):
# there's all kinds of ways to do this,
# i.e. make a Dispatch class that shares the '_listen' method
# of the Event class, this is the straight monkeypatch.
dispatch_base = getattr(cls, 'dispatch', _Dispatch)
dispatch_cls = type("%sDispatch" % classname,
(dispatch_base, ), {})
cls._set_dispatch(cls, dispatch_cls)
if hasattr(cls, 'dispatch'):
dispatch_base = cls.dispatch.__class__
else:
dispatch_base = _Dispatch
for k in dict_:
if _is_event_name(k):
setattr(dispatch_cls, k, _DispatchDescriptor(cls, dict_[k]))
_registrars[k].append(cls)
event_names = [k for k in dict_ if _is_event_name(k)]
dispatch_cls = type("%sDispatch" % classname,
(dispatch_base, ), {'__slots__': event_names})
dispatch_cls._event_names = event_names
dispatch_inst = cls._set_dispatch(cls, dispatch_cls)
for k in dispatch_cls._event_names:
setattr(dispatch_inst, k, _ClsLevelDispatch(cls, dict_[k]))
_registrars[k].append(cls)
for super_ in dispatch_cls.__bases__:
if issubclass(super_, _Dispatch) and super_ is not _Dispatch:
for ls in super_._events.dispatch._event_descriptors:
setattr(dispatch_inst, ls.name, ls)
dispatch_cls._event_names.append(ls.name)
if getattr(cls, '_dispatch_target', None):
cls._dispatch_target.dispatch = dispatcher(cls)
def _remove_dispatcher(cls):
for k in dir(cls):
if _is_event_name(k):
_registrars[k].remove(cls)
if not _registrars[k]:
del _registrars[k]
for k in cls.dispatch._event_names:
_registrars[k].remove(cls)
if not _registrars[k]:
del _registrars[k]
class Events(util.with_metaclass(_EventMeta, object)):
@ -163,17 +205,30 @@ class Events(util.with_metaclass(_EventMeta, object)):
# "self.dispatch._events.<utilitymethod>"
# @staticemethod to allow easy "super" calls while in a metaclass
# constructor.
cls.dispatch = dispatch_cls
cls.dispatch = dispatch_cls(None)
dispatch_cls._events = cls
return cls.dispatch
@classmethod
def _accept_with(cls, target):
# Mapper, ClassManager, Session override this to
# also accept classes, scoped_sessions, sessionmakers, etc.
if hasattr(target, 'dispatch') and (
isinstance(target.dispatch, cls.dispatch) or
isinstance(target.dispatch, type) and
issubclass(target.dispatch, cls.dispatch)
isinstance(target.dispatch, cls.dispatch.__class__) or
(
isinstance(target.dispatch, type) and
isinstance(target.dispatch, cls.dispatch.__class__)
) or
(
isinstance(target.dispatch, _JoinedDispatcher) and
isinstance(target.dispatch.parent, cls.dispatch.__class__)
)
):
return target
else:
@ -195,10 +250,24 @@ class Events(util.with_metaclass(_EventMeta, object)):
class _JoinedDispatcher(object):
"""Represent a connection between two _Dispatch objects."""
__slots__ = 'local', 'parent', '_instance_cls'
def __init__(self, local, parent):
self.local = local
self.parent = parent
self._parent_cls = local._parent_cls
self._instance_cls = self.local._instance_cls
def __getattr__(self, name):
# assign _JoinedListeners as attributes on demand
# to reduce startup time for new dispatch objects
ls = getattr(self.local, name)
jl = _JoinedListener(self.parent, ls.name, ls)
setattr(self, ls.name, jl)
return jl
@property
def _listen(self):
return self.parent._listen
class dispatcher(object):
@ -216,5 +285,5 @@ class dispatcher(object):
def __get__(self, obj, cls):
if obj is None:
return self.dispatch_cls
obj.__dict__['dispatch'] = disp = self.dispatch_cls(cls)
obj.__dict__['dispatch'] = disp = self.dispatch_cls._for_instance(obj)
return disp

48
lib/python3.5/site-packages/sqlalchemy/event/legacy.py
View file

@ -1,5 +1,5 @@
# event/legacy.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -22,8 +22,8 @@ def _legacy_signature(since, argnames, converter=None):
return leg
def _wrap_fn_for_legacy(dispatch_descriptor, fn, argspec):
for since, argnames, conv in dispatch_descriptor.legacy_signatures:
def _wrap_fn_for_legacy(dispatch_collection, fn, argspec):
for since, argnames, conv in dispatch_collection.legacy_signatures:
if argnames[-1] == "**kw":
has_kw = True
argnames = argnames[0:-1]
@ -40,7 +40,7 @@ def _wrap_fn_for_legacy(dispatch_descriptor, fn, argspec):
return fn(*conv(*args))
else:
def wrap_leg(*args, **kw):
argdict = dict(zip(dispatch_descriptor.arg_names, args))
argdict = dict(zip(dispatch_collection.arg_names, args))
args = [argdict[name] for name in argnames]
if has_kw:
return fn(*args, **kw)
@ -58,16 +58,16 @@ def _indent(text, indent):
)
def _standard_listen_example(dispatch_descriptor, sample_target, fn):
def _standard_listen_example(dispatch_collection, sample_target, fn):
example_kw_arg = _indent(
"\n".join(
"%(arg)s = kw['%(arg)s']" % {"arg": arg}
for arg in dispatch_descriptor.arg_names[0:2]
for arg in dispatch_collection.arg_names[0:2]
),
" ")
if dispatch_descriptor.legacy_signatures:
if dispatch_collection.legacy_signatures:
current_since = max(since for since, args, conv
in dispatch_descriptor.legacy_signatures)
in dispatch_collection.legacy_signatures)
else:
current_since = None
text = (
@ -80,7 +80,7 @@ def _standard_listen_example(dispatch_descriptor, sample_target, fn):
"\n # ... (event handling logic) ...\n"
)
if len(dispatch_descriptor.arg_names) > 3:
if len(dispatch_collection.arg_names) > 3:
text += (
"\n# named argument style (new in 0.9)\n"
@ -96,17 +96,17 @@ def _standard_listen_example(dispatch_descriptor, sample_target, fn):
"current_since": " (arguments as of %s)" %
current_since if current_since else "",
"event_name": fn.__name__,
"has_kw_arguments": ", **kw" if dispatch_descriptor.has_kw else "",
"named_event_arguments": ", ".join(dispatch_descriptor.arg_names),
"has_kw_arguments": ", **kw" if dispatch_collection.has_kw else "",
"named_event_arguments": ", ".join(dispatch_collection.arg_names),
"example_kw_arg": example_kw_arg,
"sample_target": sample_target
}
return text
def _legacy_listen_examples(dispatch_descriptor, sample_target, fn):
def _legacy_listen_examples(dispatch_collection, sample_target, fn):
text = ""
for since, args, conv in dispatch_descriptor.legacy_signatures:
for since, args, conv in dispatch_collection.legacy_signatures:
text += (
"\n# legacy calling style (pre-%(since)s)\n"
"@event.listens_for(%(sample_target)s, '%(event_name)s')\n"
@ -117,7 +117,7 @@ def _legacy_listen_examples(dispatch_descriptor, sample_target, fn):
"since": since,
"event_name": fn.__name__,
"has_kw_arguments": " **kw"
if dispatch_descriptor.has_kw else "",
if dispatch_collection.has_kw else "",
"named_event_arguments": ", ".join(args),
"sample_target": sample_target
}
@ -125,8 +125,8 @@ def _legacy_listen_examples(dispatch_descriptor, sample_target, fn):
return text
def _version_signature_changes(dispatch_descriptor):
since, args, conv = dispatch_descriptor.legacy_signatures[0]
def _version_signature_changes(dispatch_collection):
since, args, conv = dispatch_collection.legacy_signatures[0]
return (
"\n.. versionchanged:: %(since)s\n"
" The ``%(event_name)s`` event now accepts the \n"
@ -135,14 +135,14 @@ def _version_signature_changes(dispatch_descriptor):
" signature(s) listed above will be automatically \n"
" adapted to the new signature." % {
"since": since,
"event_name": dispatch_descriptor.__name__,
"named_event_arguments": ", ".join(dispatch_descriptor.arg_names),
"has_kw_arguments": ", **kw" if dispatch_descriptor.has_kw else ""
"event_name": dispatch_collection.name,
"named_event_arguments": ", ".join(dispatch_collection.arg_names),
"has_kw_arguments": ", **kw" if dispatch_collection.has_kw else ""
}
)
def _augment_fn_docs(dispatch_descriptor, parent_dispatch_cls, fn):
def _augment_fn_docs(dispatch_collection, parent_dispatch_cls, fn):
header = ".. container:: event_signatures\n\n"\
" Example argument forms::\n"\
"\n"
@ -152,16 +152,16 @@ def _augment_fn_docs(dispatch_descriptor, parent_dispatch_cls, fn):
header +
_indent(
_standard_listen_example(
dispatch_descriptor, sample_target, fn),
dispatch_collection, sample_target, fn),
" " * 8)
)
if dispatch_descriptor.legacy_signatures:
if dispatch_collection.legacy_signatures:
text += _indent(
_legacy_listen_examples(
dispatch_descriptor, sample_target, fn),
dispatch_collection, sample_target, fn),
" " * 8)
text += _version_signature_changes(dispatch_descriptor)
text += _version_signature_changes(dispatch_collection)
return util.inject_docstring_text(fn.__doc__,
text,

54
lib/python3.5/site-packages/sqlalchemy/event/registry.py
View file

@ -1,5 +1,5 @@
# event/registry.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -37,7 +37,7 @@ listener collections and the listener fn contained
_collection_to_key = collections.defaultdict(dict)
"""
Given a _ListenerCollection or _DispatchDescriptor, can locate
Given a _ListenerCollection or _ClsLevelListener, can locate
all the original listen() arguments and the listener fn contained
ref(listenercollection) -> {
@ -71,13 +71,15 @@ def _stored_in_collection(event_key, owner):
listen_ref = weakref.ref(event_key._listen_fn)
if owner_ref in dispatch_reg:
assert dispatch_reg[owner_ref] == listen_ref
else:
dispatch_reg[owner_ref] = listen_ref
return False
dispatch_reg[owner_ref] = listen_ref
listener_to_key = _collection_to_key[owner_ref]
listener_to_key[listen_ref] = key
return True
def _removed_from_collection(event_key, owner):
key = event_key._key
@ -138,6 +140,10 @@ class _EventKey(object):
"""Represent :func:`.listen` arguments.
"""
__slots__ = (
'target', 'identifier', 'fn', 'fn_key', 'fn_wrap', 'dispatch_target'
)
def __init__(self, target, identifier,
fn, dispatch_target, _fn_wrap=None):
self.target = target
@ -180,6 +186,17 @@ class _EventKey(object):
def listen(self, *args, **kw):
once = kw.pop("once", False)
named = kw.pop("named", False)
target, identifier, fn = \
self.dispatch_target, self.identifier, self._listen_fn
dispatch_collection = getattr(target.dispatch, identifier)
adjusted_fn = dispatch_collection._adjust_fn_spec(fn, named)
self = self.with_wrapper(adjusted_fn)
if once:
self.with_wrapper(
util.only_once(self._listen_fn)).listen(*args, **kw)
@ -213,34 +230,33 @@ class _EventKey(object):
target, identifier, fn = \
self.dispatch_target, self.identifier, self._listen_fn
dispatch_descriptor = getattr(target.dispatch, identifier)
fn = dispatch_descriptor._adjust_fn_spec(fn, named)
self = self.with_wrapper(fn)
dispatch_collection = getattr(target.dispatch, identifier)
if insert:
dispatch_descriptor.\
dispatch_collection.\
for_modify(target.dispatch).insert(self, propagate)
else:
dispatch_descriptor.\
dispatch_collection.\
for_modify(target.dispatch).append(self, propagate)
@property
def _listen_fn(self):
return self.fn_wrap or self.fn
def append_value_to_list(self, owner, list_, value):
_stored_in_collection(self, owner)
list_.append(value)
def append_to_list(self, owner, list_):
_stored_in_collection(self, owner)
list_.append(self._listen_fn)
if _stored_in_collection(self, owner):
list_.append(self._listen_fn)
return True
else:
return False
def remove_from_list(self, owner, list_):
_removed_from_collection(self, owner)
list_.remove(self._listen_fn)
def prepend_to_list(self, owner, list_):
_stored_in_collection(self, owner)
list_.insert(0, self._listen_fn)
if _stored_in_collection(self, owner):
list_.appendleft(self._listen_fn)
return True
else:
return False

108
lib/python3.5/site-packages/sqlalchemy/events.py
View file

@ -1,5 +1,5 @@
# sqlalchemy/events.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -338,7 +338,7 @@ class PoolEvents(event.Events):
"""
def reset(self, dbapi_connnection, connection_record):
def reset(self, dbapi_connection, connection_record):
"""Called before the "reset" action occurs for a pooled connection.
This event represents
@ -371,7 +371,9 @@ class PoolEvents(event.Events):
"""Called when a DBAPI connection is to be "invalidated".
This event is called any time the :meth:`._ConnectionRecord.invalidate`
method is invoked, either from API usage or via "auto-invalidation".
method is invoked, either from API usage or via "auto-invalidation",
without the ``soft`` flag.
The event occurs before a final attempt to call ``.close()`` on the
connection occurs.
@ -392,6 +394,21 @@ class PoolEvents(event.Events):
"""
def soft_invalidate(self, dbapi_connection, connection_record, exception):
"""Called when a DBAPI connection is to be "soft invalidated".
This event is called any time the :meth:`._ConnectionRecord.invalidate`
method is invoked with the ``soft`` flag.
Soft invalidation refers to when the connection record that tracks
this connection will force a reconnect after the current connection
is checked in. It does not actively close the dbapi_connection
at the point at which it is called.
.. versionadded:: 1.0.3
"""
class ConnectionEvents(event.Events):
"""Available events for :class:`.Connectable`, which includes
@ -420,6 +437,12 @@ class ConnectionEvents(event.Events):
context, executemany):
log.info("Received statement: %s" % statement)
When the methods are called with a `statement` parameter, such as in
:meth:`.after_cursor_execute`, :meth:`.before_cursor_execute` and
:meth:`.dbapi_error`, the statement is the exact SQL string that was
prepared for transmission to the DBAPI ``cursor`` in the connection's
:class:`.Dialect`.
The :meth:`.before_execute` and :meth:`.before_cursor_execute`
events can also be established with the ``retval=True`` flag, which
allows modification of the statement and parameters to be sent
@ -470,7 +493,8 @@ class ConnectionEvents(event.Events):
@classmethod
def _listen(cls, event_key, retval=False):
target, identifier, fn = \
event_key.dispatch_target, event_key.identifier, event_key.fn
event_key.dispatch_target, event_key.identifier, \
event_key._listen_fn
target._has_events = True
@ -548,9 +572,8 @@ class ConnectionEvents(event.Events):
def before_cursor_execute(self, conn, cursor, statement,
parameters, context, executemany):
"""Intercept low-level cursor execute() events before execution,
receiving the string
SQL statement and DBAPI-specific parameter list to be invoked
against a cursor.
receiving the string SQL statement and DBAPI-specific parameter list to
be invoked against a cursor.
This event is a good choice for logging as well as late modifications
to the SQL string. It's less ideal for parameter modifications except
@ -570,7 +593,7 @@ class ConnectionEvents(event.Events):
:param conn: :class:`.Connection` object
:param cursor: DBAPI cursor object
:param statement: string SQL statement
:param statement: string SQL statement, as to be passed to the DBAPI
:param parameters: Dictionary, tuple, or list of parameters being
passed to the ``execute()`` or ``executemany()`` method of the
DBAPI ``cursor``. In some cases may be ``None``.
@ -595,7 +618,7 @@ class ConnectionEvents(event.Events):
:param cursor: DBAPI cursor object. Will have results pending
if the statement was a SELECT, but these should not be consumed
as they will be needed by the :class:`.ResultProxy`.
:param statement: string SQL statement
:param statement: string SQL statement, as passed to the DBAPI
:param parameters: Dictionary, tuple, or list of parameters being
passed to the ``execute()`` or ``executemany()`` method of the
DBAPI ``cursor``. In some cases may be ``None``.
@ -639,7 +662,7 @@ class ConnectionEvents(event.Events):
:param conn: :class:`.Connection` object
:param cursor: DBAPI cursor object
:param statement: string SQL statement
:param statement: string SQL statement, as passed to the DBAPI
:param parameters: Dictionary, tuple, or list of parameters being
passed to the ``execute()`` or ``executemany()`` method of the
DBAPI ``cursor``. In some cases may be ``None``.
@ -701,6 +724,16 @@ class ConnectionEvents(event.Events):
"failed" in str(context.original_exception):
raise MySpecialException("failed operation")
.. warning:: Because the :meth:`.ConnectionEvents.handle_error`
event specifically provides for exceptions to be re-thrown as
the ultimate exception raised by the failed statement,
**stack traces will be misleading** if the user-defined event
handler itself fails and throws an unexpected exception;
the stack trace may not illustrate the actual code line that
failed! It is advised to code carefully here and use
logging and/or inline debugging if unexpected exceptions are
occurring.
Alternatively, a "chained" style of event handling can be
used, by configuring the handler with the ``retval=True``
modifier and returning the new exception instance from the
@ -733,6 +766,22 @@ class ConnectionEvents(event.Events):
.. versionadded:: 0.9.7 Added the
:meth:`.ConnectionEvents.handle_error` hook.
.. versionchanged:: 1.0.0 The :meth:`.handle_error` event is now
invoked when an :class:`.Engine` fails during the initial
call to :meth:`.Engine.connect`, as well as when a
:class:`.Connection` object encounters an error during a
reconnect operation.
.. versionchanged:: 1.0.0 The :meth:`.handle_error` event is
not fired off when a dialect makes use of the
``skip_user_error_events`` execution option. This is used
by dialects which intend to catch SQLAlchemy-specific exceptions
within specific operations, such as when the MySQL dialect detects
a table not present within the ``has_table()`` dialect method.
Prior to 1.0.0, code which implements :meth:`.handle_error` needs
to ensure that exceptions thrown in these scenarios are re-raised
without modification.
"""
def engine_connect(self, conn, branch):
@ -770,6 +819,11 @@ class ConnectionEvents(event.Events):
.. seealso::
:ref:`pool_disconnects_pessimistic` - illustrates how to use
:meth:`.ConnectionEvents.engine_connect`
to transparently ensure pooled connections are connected to the
database.
:meth:`.PoolEvents.checkout` the lower-level pool checkout event
for an individual DBAPI connection
@ -833,6 +887,23 @@ class ConnectionEvents(event.Events):
"""
def engine_disposed(self, engine):
"""Intercept when the :meth:`.Engine.dispose` method is called.
The :meth:`.Engine.dispose` method instructs the engine to
"dispose" of it's connection pool (e.g. :class:`.Pool`), and
replaces it with a new one. Disposing of the old pool has the
effect that existing checked-in connections are closed. The new
pool does not establish any new connections until it is first used.
This event can be used to indicate that resources related to the
:class:`.Engine` should also be cleaned up, keeping in mind that the
:class:`.Engine` can still be used for new requests in which case
it re-acquires connection resources.
.. versionadded:: 1.0.5
"""
def begin(self, conn):
"""Intercept begin() events.
@ -985,6 +1056,23 @@ class DialectEvents(event.Events):
else:
return target
def do_connect(self, dialect, conn_rec, cargs, cparams):
"""Receive connection arguments before a connection is made.
Return a DBAPI connection to halt further events from invoking;
the returned connection will be used.
Alternatively, the event can manipulate the cargs and/or cparams
collections; cargs will always be a Python list that can be mutated
in-place and cparams a Python dictionary. Return None to
allow control to pass to the next event handler and ultimately
to allow the dialect to connect normally, given the updated
arguments.
.. versionadded:: 1.0.3
"""
def do_executemany(self, cursor, statement, parameters, context):
"""Receive a cursor to have executemany() called.

51
lib/python3.5/site-packages/sqlalchemy/exc.py
View file

@ -1,5 +1,5 @@
# sqlalchemy/exc.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -13,8 +13,6 @@ raised as a result of DBAPI exceptions are all subclasses of
"""
import traceback
class SQLAlchemyError(Exception):
"""Generic error class."""
@ -54,8 +52,7 @@ class CircularDependencyError(SQLAlchemyError):
or pre-deassociate one of the foreign key constrained values.
The ``post_update`` flag described at :ref:`post_update` can resolve
this cycle.
* In a :meth:`.MetaData.create_all`, :meth:`.MetaData.drop_all`,
:attr:`.MetaData.sorted_tables` operation, two :class:`.ForeignKey`
* In a :attr:`.MetaData.sorted_tables` operation, two :class:`.ForeignKey`
or :class:`.ForeignKeyConstraint` objects mutually refer to each
other. Apply the ``use_alter=True`` flag to one or both,
see :ref:`use_alter`.
@ -63,7 +60,7 @@ class CircularDependencyError(SQLAlchemyError):
"""
def __init__(self, message, cycles, edges, msg=None):
if msg is None:
message += " Cycles: %r all edges: %r" % (cycles, edges)
message += " (%s)" % ", ".join(repr(s) for s in cycles)
else:
message = msg
SQLAlchemyError.__init__(self, message)
@ -238,14 +235,16 @@ class StatementError(SQLAlchemyError):
def __str__(self):
from sqlalchemy.sql import util
params_repr = util._repr_params(self.params, 10)
details = [SQLAlchemyError.__str__(self)]
if self.statement:
details.append("[SQL: %r]" % self.statement)
if self.params:
params_repr = util._repr_params(self.params, 10)
details.append("[parameters: %r]" % params_repr)
return ' '.join([
"(%s)" % det for det in self.detail
] + [
SQLAlchemyError.__str__(self),
repr(self.statement), repr(params_repr)
])
] + details)
def __unicode__(self):
return self.__str__()
@ -277,26 +276,35 @@ class DBAPIError(StatementError):
@classmethod
def instance(cls, statement, params,
orig, dbapi_base_err,
connection_invalidated=False):
connection_invalidated=False,
dialect=None):
# Don't ever wrap these, just return them directly as if
# DBAPIError didn't exist.
if isinstance(orig, (KeyboardInterrupt, SystemExit, DontWrapMixin)):
if (isinstance(orig, BaseException) and
not isinstance(orig, Exception)) or \
isinstance(orig, DontWrapMixin):
return orig
if orig is not None:
# not a DBAPI error, statement is present.
# raise a StatementError
if not isinstance(orig, dbapi_base_err) and statement:
msg = traceback.format_exception_only(
orig.__class__, orig)[-1].strip()
return StatementError(
"%s (original cause: %s)" % (str(orig), msg),
"(%s.%s) %s" %
(orig.__class__.__module__, orig.__class__.__name__,
orig),
statement, params, orig
)
name, glob = orig.__class__.__name__, globals()
if name in glob and issubclass(glob[name], DBAPIError):
cls = glob[name]
glob = globals()
for super_ in orig.__class__.__mro__:
name = super_.__name__
if dialect:
name = dialect.dbapi_exception_translation_map.get(
name, name)
if name in glob and issubclass(glob[name], DBAPIError):
cls = glob[name]
break
return cls(statement, params, orig, connection_invalidated)
@ -307,13 +315,12 @@ class DBAPIError(StatementError):
def __init__(self, statement, params, orig, connection_invalidated=False):
try:
text = str(orig)
except (KeyboardInterrupt, SystemExit):
raise
except Exception as e:
text = 'Error in str() of DB-API-generated exception: ' + str(e)
StatementError.__init__(
self,
'(%s) %s' % (orig.__class__.__name__, text),
'(%s.%s) %s' % (
orig.__class__.__module__, orig.__class__.__name__, text, ),
statement,
params,
orig

7
lib/python3.5/site-packages/sqlalchemy/ext/__init__.py
View file

@ -1,6 +1,11 @@
# ext/__init__.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
from .. import util as _sa_util
_sa_util.dependencies.resolve_all("sqlalchemy.ext")

42
lib/python3.5/site-packages/sqlalchemy/ext/associationproxy.py
View file

@ -1,5 +1,5 @@
# ext/associationproxy.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -77,16 +77,16 @@ def association_proxy(target_collection, attr, **kw):
ASSOCIATION_PROXY = util.symbol('ASSOCIATION_PROXY')
"""Symbol indicating an :class:`_InspectionAttr` that's
"""Symbol indicating an :class:`InspectionAttr` that's
of type :class:`.AssociationProxy`.
Is assigned to the :attr:`._InspectionAttr.extension_type`
Is assigned to the :attr:`.InspectionAttr.extension_type`
attibute.
"""
class AssociationProxy(interfaces._InspectionAttr):
class AssociationProxy(interfaces.InspectionAttrInfo):
"""A descriptor that presents a read/write view of an object attribute."""
is_attribute = False
@ -94,7 +94,7 @@ class AssociationProxy(interfaces._InspectionAttr):
def __init__(self, target_collection, attr, creator=None,
getset_factory=None, proxy_factory=None,
proxy_bulk_set=None):
proxy_bulk_set=None, info=None):
"""Construct a new :class:`.AssociationProxy`.
The :func:`.association_proxy` function is provided as the usual
@ -138,6 +138,11 @@ class AssociationProxy(interfaces._InspectionAttr):
:param proxy_bulk_set: Optional, use with proxy_factory. See
the _set() method for details.
:param info: optional, will be assigned to
:attr:`.AssociationProxy.info` if present.
.. versionadded:: 1.0.9
"""
self.target_collection = target_collection
self.value_attr = attr
@ -150,6 +155,8 @@ class AssociationProxy(interfaces._InspectionAttr):
self.key = '_%s_%s_%s' % (
type(self).__name__, target_collection, id(self))
self.collection_class = None
if info:
self.info = info
@property
def remote_attr(self):
@ -365,13 +372,17 @@ class AssociationProxy(interfaces._InspectionAttr):
operators of the underlying proxied attributes.
"""
if self._value_is_scalar:
value_expr = getattr(
self.target_class, self.value_attr).has(criterion, **kwargs)
if self._target_is_object:
if self._value_is_scalar:
value_expr = getattr(
self.target_class, self.value_attr).has(
criterion, **kwargs)
else:
value_expr = getattr(
self.target_class, self.value_attr).any(
criterion, **kwargs)
else:
value_expr = getattr(
self.target_class, self.value_attr).any(criterion, **kwargs)
value_expr = criterion
# check _value_is_scalar here, otherwise
# we're scalar->scalar - call .any() so that
@ -527,7 +538,10 @@ class _AssociationList(_AssociationCollection):
return self.setter(object, value)
def __getitem__(self, index):
return self._get(self.col[index])
if not isinstance(index, slice):
return self._get(self.col[index])
else:
return [self._get(member) for member in self.col[index]]
def __setitem__(self, index, value):
if not isinstance(index, slice):
@ -589,7 +603,7 @@ class _AssociationList(_AssociationCollection):
for member in self.col:
yield self._get(member)
raise StopIteration
return
def append(self, value):
item = self._create(value)
@ -893,7 +907,7 @@ class _AssociationSet(_AssociationCollection):
"""
for member in self.col:
yield self._get(member)
raise StopIteration
return
def add(self, value):
if value not in self:

77
lib/python3.5/site-packages/sqlalchemy/ext/automap.py
View file

@ -1,5 +1,5 @@
# ext/automap.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -11,12 +11,6 @@ schema, typically though not necessarily one which is reflected.
.. versionadded:: 0.9.1 Added :mod:`sqlalchemy.ext.automap`.
.. note::
The :mod:`sqlalchemy.ext.automap` extension should be considered
**experimental** as of 0.9.1. Featureset and API stability is
not guaranteed at this time.
It is hoped that the :class:`.AutomapBase` system provides a quick
and modernized solution to the problem that the very famous
`SQLSoup <https://sqlsoup.readthedocs.org/en/latest/>`_
@ -67,7 +61,7 @@ asking it to reflect the schema and produce mappings::
Above, calling :meth:`.AutomapBase.prepare` while passing along the
:paramref:`.AutomapBase.prepare.reflect` parameter indicates that the
:meth:`.MetaData.reflect` method will be called on this declarative base
classes' :class:`.MetaData` collection; then, each viable
classes' :class:`.MetaData` collection; then, each **viable**
:class:`.Table` within the :class:`.MetaData` will get a new mapped class
generated automatically. The :class:`.ForeignKeyConstraint` objects which
link the various tables together will be used to produce new, bidirectional
@ -76,6 +70,12 @@ follow along a default naming scheme that we can customize. At this point,
our basic mapping consisting of related ``User`` and ``Address`` classes is
ready to use in the traditional way.
.. note:: By **viable**, we mean that for a table to be mapped, it must
specify a primary key. Additionally, if the table is detected as being
a pure association table between two other tables, it will not be directly
mapped and will instead be configured as a many-to-many table between
the mappings for the two referring tables.
Generating Mappings from an Existing MetaData
=============================================
@ -111,8 +111,8 @@ explicit table declaration::
User, Address, Order = Base.classes.user, Base.classes.address,\
Base.classes.user_order
Specifying Classes Explcitly
============================
Specifying Classes Explicitly
=============================
The :mod:`.sqlalchemy.ext.automap` extension allows classes to be defined
explicitly, in a way similar to that of the :class:`.DeferredReflection` class.
@ -188,7 +188,7 @@ scheme for class names and a "pluralizer" for collection names using the
"'words_and_underscores' -> 'WordsAndUnderscores'"
return str(tablename[0].upper() + \\
re.sub(r'_(\w)', lambda m: m.group(1).upper(), tablename[1:]))
re.sub(r'_([a-z])', lambda m: m.group(1).upper(), tablename[1:]))
_pluralizer = inflect.engine()
def pluralize_collection(base, local_cls, referred_cls, constraint):
@ -196,10 +196,9 @@ scheme for class names and a "pluralizer" for collection names using the
"'SomeTerm' -> 'some_terms'"
referred_name = referred_cls.__name__
uncamelized = referred_name[0].lower() + \\
re.sub(r'\W',
lambda m: "_%s" % m.group(0).lower(),
referred_name[1:])
uncamelized = re.sub(r'[A-Z]',
lambda m: "_%s" % m.group(0).lower(),
referred_name)[1:]
pluralized = _pluralizer.plural(uncamelized)
return pluralized
@ -243,7 +242,26 @@ follows:
one-to-many backref will be created on the referred class referring
to this class.
4. The names of the relationships are determined using the
4. If any of the columns that are part of the :class:`.ForeignKeyConstraint`
are not nullable (e.g. ``nullable=False``), a
:paramref:`~.relationship.cascade` keyword argument
of ``all, delete-orphan`` will be added to the keyword arguments to
be passed to the relationship or backref. If the
:class:`.ForeignKeyConstraint` reports that
:paramref:`.ForeignKeyConstraint.ondelete`
is set to ``CASCADE`` for a not null or ``SET NULL`` for a nullable
set of columns, the option :paramref:`~.relationship.passive_deletes`
flag is set to ``True`` in the set of relationship keyword arguments.
Note that not all backends support reflection of ON DELETE.
.. versionadded:: 1.0.0 - automap will detect non-nullable foreign key
constraints when producing a one-to-many relationship and establish
a default cascade of ``all, delete-orphan`` if so; additionally,
if the constraint specifies :paramref:`.ForeignKeyConstraint.ondelete`
of ``CASCADE`` for non-nullable or ``SET NULL`` for nullable columns,
the ``passive_deletes=True`` option is also added.
5. The names of the relationships are determined using the
:paramref:`.AutomapBase.prepare.name_for_scalar_relationship` and
:paramref:`.AutomapBase.prepare.name_for_collection_relationship`
callable functions. It is important to note that the default relationship
@ -252,18 +270,18 @@ follows:
alternate class naming scheme, that's the name from which the relationship
name will be derived.
5. The classes are inspected for an existing mapped property matching these
6. The classes are inspected for an existing mapped property matching these
names. If one is detected on one side, but none on the other side,
:class:`.AutomapBase` attempts to create a relationship on the missing side,
then uses the :paramref:`.relationship.back_populates` parameter in order to
point the new relationship to the other side.
6. In the usual case where no relationship is on either side,
7. In the usual case where no relationship is on either side,
:meth:`.AutomapBase.prepare` produces a :func:`.relationship` on the
"many-to-one" side and matches it to the other using the
:paramref:`.relationship.backref` parameter.
7. Production of the :func:`.relationship` and optionally the :func:`.backref`
8. Production of the :func:`.relationship` and optionally the :func:`.backref`
is handed off to the :paramref:`.AutomapBase.prepare.generate_relationship`
function, which can be supplied by the end-user in order to augment
the arguments passed to :func:`.relationship` or :func:`.backref` or to
@ -606,7 +624,7 @@ def generate_relationship(
:param base: the :class:`.AutomapBase` class doing the prepare.
:param direction: indicate the "direction" of the relationship; this will
be one of :data:`.ONETOMANY`, :data:`.MANYTOONE`, :data:`.MANYTOONE`.
be one of :data:`.ONETOMANY`, :data:`.MANYTOONE`, :data:`.MANYTOMANY`.
:param return_fn: the function that is used by default to create the
relationship. This will be either :func:`.relationship` or
@ -877,6 +895,19 @@ def _relationships_for_fks(automap_base, map_config, table_to_map_config,
constraint
)
o2m_kws = {}
nullable = False not in set([fk.parent.nullable for fk in fks])
if not nullable:
o2m_kws['cascade'] = "all, delete-orphan"
if constraint.ondelete and \
constraint.ondelete.lower() == "cascade":
o2m_kws['passive_deletes'] = True
else:
if constraint.ondelete and \
constraint.ondelete.lower() == "set null":
o2m_kws['passive_deletes'] = True
create_backref = backref_name not in referred_cfg.properties
if relationship_name not in map_config.properties:
@ -885,7 +916,8 @@ def _relationships_for_fks(automap_base, map_config, table_to_map_config,
automap_base,
interfaces.ONETOMANY, backref,
backref_name, referred_cls, local_cls,
collection_class=collection_class)
collection_class=collection_class,
**o2m_kws)
else:
backref_obj = None
rel = generate_relationship(automap_base,
@ -916,7 +948,8 @@ def _relationships_for_fks(automap_base, map_config, table_to_map_config,
fk.parent
for fk in constraint.elements],
back_populates=relationship_name,
collection_class=collection_class)
collection_class=collection_class,
**o2m_kws)
if rel is not None:
referred_cfg.properties[backref_name] = rel
map_config.properties[

523
lib/python3.5/site-packages/sqlalchemy/ext/baked.py Normal file
View file

@ -0,0 +1,523 @@
# sqlalchemy/ext/baked.py
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
"""Baked query extension.
Provides a creational pattern for the :class:`.query.Query` object which
allows the fully constructed object, Core select statement, and string
compiled result to be fully cached.
"""
from ..orm.query import Query
from ..orm import strategies, attributes, properties, \
strategy_options, util as orm_util, interfaces
from .. import log as sqla_log
from ..sql import util as sql_util
from ..orm import exc as orm_exc
from .. import exc as sa_exc
from .. import util
import copy
import logging
log = logging.getLogger(__name__)
class BakedQuery(object):
"""A builder object for :class:`.query.Query` objects."""
__slots__ = 'steps', '_bakery', '_cache_key', '_spoiled'
def __init__(self, bakery, initial_fn, args=()):
self._cache_key = ()
self._update_cache_key(initial_fn, args)
self.steps = [initial_fn]
self._spoiled = False
self._bakery = bakery
@classmethod
def bakery(cls, size=200):
"""Construct a new bakery."""
_bakery = util.LRUCache(size)
def call(initial_fn, *args):
return cls(_bakery, initial_fn, args)
return call
def _clone(self):
b1 = BakedQuery.__new__(BakedQuery)
b1._cache_key = self._cache_key
b1.steps = list(self.steps)
b1._bakery = self._bakery
b1._spoiled = self._spoiled
return b1
def _update_cache_key(self, fn, args=()):
self._cache_key += (fn.__code__,) + args
def __iadd__(self, other):
if isinstance(other, tuple):
self.add_criteria(*other)
else:
self.add_criteria(other)
return self
def __add__(self, other):
if isinstance(other, tuple):
return self.with_criteria(*other)
else:
return self.with_criteria(other)
def add_criteria(self, fn, *args):
"""Add a criteria function to this :class:`.BakedQuery`.
This is equivalent to using the ``+=`` operator to
modify a :class:`.BakedQuery` in-place.
"""
self._update_cache_key(fn, args)
self.steps.append(fn)
return self
def with_criteria(self, fn, *args):
"""Add a criteria function to a :class:`.BakedQuery` cloned from this one.
This is equivalent to using the ``+`` operator to
produce a new :class:`.BakedQuery` with modifications.
"""
return self._clone().add_criteria(fn, *args)
def for_session(self, session):
"""Return a :class:`.Result` object for this :class:`.BakedQuery`.
This is equivalent to calling the :class:`.BakedQuery` as a
Python callable, e.g. ``result = my_baked_query(session)``.
"""
return Result(self, session)
def __call__(self, session):
return self.for_session(session)
def spoil(self, full=False):
"""Cancel any query caching that will occur on this BakedQuery object.
The BakedQuery can continue to be used normally, however additional
creational functions will not be cached; they will be called
on every invocation.
This is to support the case where a particular step in constructing
a baked query disqualifies the query from being cacheable, such
as a variant that relies upon some uncacheable value.
:param full: if False, only functions added to this
:class:`.BakedQuery` object subsequent to the spoil step will be
non-cached; the state of the :class:`.BakedQuery` up until
this point will be pulled from the cache. If True, then the
entire :class:`.Query` object is built from scratch each
time, with all creational functions being called on each
invocation.
"""
if not full:
_spoil_point = self._clone()
_spoil_point._cache_key += ('_query_only', )
self.steps = [_spoil_point._retrieve_baked_query]
self._spoiled = True
return self
def _retrieve_baked_query(self, session):
query = self._bakery.get(self._cache_key, None)
if query is None:
query = self._as_query(session)
self._bakery[self._cache_key] = query.with_session(None)
return query.with_session(session)
def _bake(self, session):
query = self._as_query(session)
context = query._compile_context()
self._bake_subquery_loaders(session, context)
context.session = None
context.query = query = context.query.with_session(None)
query._execution_options = query._execution_options.union(
{"compiled_cache": self._bakery}
)
# we'll be holding onto the query for some of its state,
# so delete some compilation-use-only attributes that can take up
# space
for attr in (
'_correlate', '_from_obj', '_mapper_adapter_map',
'_joinpath', '_joinpoint'):
query.__dict__.pop(attr, None)
self._bakery[self._cache_key] = context
return context
def _as_query(self, session):
query = self.steps[0](session)
for step in self.steps[1:]:
query = step(query)
return query
def _bake_subquery_loaders(self, session, context):
"""convert subquery eager loaders in the cache into baked queries.
For subquery eager loading to work, all we need here is that the
Query point to the correct session when it is run. However, since
we are "baking" anyway, we may as well also turn the query into
a "baked" query so that we save on performance too.
"""
context.attributes['baked_queries'] = baked_queries = []
for k, v in list(context.attributes.items()):
if isinstance(v, Query):
if 'subquery' in k:
bk = BakedQuery(self._bakery, lambda *args: v)
bk._cache_key = self._cache_key + k
bk._bake(session)
baked_queries.append((k, bk._cache_key, v))
del context.attributes[k]
def _unbake_subquery_loaders(self, session, context, params):
"""Retrieve subquery eager loaders stored by _bake_subquery_loaders
and turn them back into Result objects that will iterate just
like a Query object.
"""
for k, cache_key, query in context.attributes["baked_queries"]:
bk = BakedQuery(self._bakery, lambda sess: query.with_session(sess))
bk._cache_key = cache_key
context.attributes[k] = bk.for_session(session).params(**params)
class Result(object):
"""Invokes a :class:`.BakedQuery` against a :class:`.Session`.
The :class:`.Result` object is where the actual :class:`.query.Query`
object gets created, or retrieved from the cache,
against a target :class:`.Session`, and is then invoked for results.
"""
__slots__ = 'bq', 'session', '_params'
def __init__(self, bq, session):
self.bq = bq
self.session = session
self._params = {}
def params(self, *args, **kw):
"""Specify parameters to be replaced into the string SQL statement."""
if len(args) == 1:
kw.update(args[0])
elif len(args) > 0:
raise sa_exc.ArgumentError(
"params() takes zero or one positional argument, "
"which is a dictionary.")
self._params.update(kw)
return self
def _as_query(self):
return self.bq._as_query(self.session).params(self._params)
def __str__(self):
return str(self._as_query())
def __iter__(self):
bq = self.bq
if bq._spoiled:
return iter(self._as_query())
baked_context = bq._bakery.get(bq._cache_key, None)
if baked_context is None:
baked_context = bq._bake(self.session)
context = copy.copy(baked_context)
context.session = self.session
context.attributes = context.attributes.copy()
bq._unbake_subquery_loaders(self.session, context, self._params)
context.statement.use_labels = True
if context.autoflush and not context.populate_existing:
self.session._autoflush()
return context.query.params(self._params).\
with_session(self.session)._execute_and_instances(context)
def first(self):
"""Return the first row.
Equivalent to :meth:`.Query.first`.
"""
bq = self.bq.with_criteria(lambda q: q.slice(0, 1))
ret = list(bq.for_session(self.session).params(self._params))
if len(ret) > 0:
return ret[0]
else:
return None
def one(self):
"""Return exactly one result or raise an exception.
Equivalent to :meth:`.Query.one`.
"""
ret = list(self)
l = len(ret)
if l == 1:
return ret[0]
elif l == 0:
raise orm_exc.NoResultFound("No row was found for one()")
else:
raise orm_exc.MultipleResultsFound(
"Multiple rows were found for one()")
def one_or_none(self):
"""Return one or zero results, or raise an exception for multiple
rows.
Equivalent to :meth:`.Query.one_or_none`.
.. versionadded:: 1.0.9
"""
ret = list(self)
l = len(ret)
if l == 1:
return ret[0]
elif l == 0:
return None
else:
raise orm_exc.MultipleResultsFound(
"Multiple rows were found for one_or_none()")
def all(self):
"""Return all rows.
Equivalent to :meth:`.Query.all`.
"""
return list(self)
def get(self, ident):
"""Retrieve an object based on identity.
Equivalent to :meth:`.Query.get`.
"""
query = self.bq.steps[0](self.session)
return query._get_impl(ident, self._load_on_ident)
def _load_on_ident(self, query, key):
"""Load the given identity key from the database."""
ident = key[1]
mapper = query._mapper_zero()
_get_clause, _get_params = mapper._get_clause
def setup(query):
_lcl_get_clause = _get_clause
q = query._clone()
q._get_condition()
q._order_by = None
# None present in ident - turn those comparisons
# into "IS NULL"
if None in ident:
nones = set([
_get_params[col].key for col, value in
zip(mapper.primary_key, ident) if value is None
])
_lcl_get_clause = sql_util.adapt_criterion_to_null(
_lcl_get_clause, nones)
_lcl_get_clause = q._adapt_clause(_lcl_get_clause, True, False)
q._criterion = _lcl_get_clause
return q
# cache the query against a key that includes
# which positions in the primary key are NULL
# (remember, we can map to an OUTER JOIN)
bq = self.bq
# add the clause we got from mapper._get_clause to the cache
# key so that if a race causes multiple calls to _get_clause,
# we've cached on ours
bq = bq._clone()
bq._cache_key += (_get_clause, )
bq = bq.with_criteria(setup, tuple(elem is None for elem in ident))
params = dict([
(_get_params[primary_key].key, id_val)
for id_val, primary_key in zip(ident, mapper.primary_key)
])
result = list(bq.for_session(self.session).params(**params))
l = len(result)
if l > 1:
raise orm_exc.MultipleResultsFound()
elif l:
return result[0]
else:
return None
def bake_lazy_loaders():
"""Enable the use of baked queries for all lazyloaders systemwide.
This operation should be safe for all lazy loaders, and will reduce
Python overhead for these operations.
"""
BakedLazyLoader._strategy_keys[:] = []
properties.RelationshipProperty.strategy_for(
lazy="select")(BakedLazyLoader)
properties.RelationshipProperty.strategy_for(
lazy=True)(BakedLazyLoader)
properties.RelationshipProperty.strategy_for(
lazy="baked_select")(BakedLazyLoader)
strategies.LazyLoader._strategy_keys[:] = BakedLazyLoader._strategy_keys[:]
def unbake_lazy_loaders():
"""Disable the use of baked queries for all lazyloaders systemwide.
This operation reverts the changes produced by :func:`.bake_lazy_loaders`.
"""
strategies.LazyLoader._strategy_keys[:] = []
BakedLazyLoader._strategy_keys[:] = []
properties.RelationshipProperty.strategy_for(
lazy="select")(strategies.LazyLoader)
properties.RelationshipProperty.strategy_for(
lazy=True)(strategies.LazyLoader)
properties.RelationshipProperty.strategy_for(
lazy="baked_select")(BakedLazyLoader)
assert strategies.LazyLoader._strategy_keys
@sqla_log.class_logger
@properties.RelationshipProperty.strategy_for(lazy="baked_select")
class BakedLazyLoader(strategies.LazyLoader):
def _emit_lazyload(self, session, state, ident_key, passive):
q = BakedQuery(
self.mapper._compiled_cache,
lambda session: session.query(self.mapper))
q.add_criteria(
lambda q: q._adapt_all_clauses()._with_invoke_all_eagers(False),
self.parent_property)
if not self.parent_property.bake_queries:
q.spoil(full=True)
if self.parent_property.secondary is not None:
q.add_criteria(
lambda q:
q.select_from(self.mapper, self.parent_property.secondary))
pending = not state.key
# don't autoflush on pending
if pending or passive & attributes.NO_AUTOFLUSH:
q.add_criteria(lambda q: q.autoflush(False))
if state.load_path:
q.spoil()
q.add_criteria(
lambda q:
q._with_current_path(state.load_path[self.parent_property]))
if state.load_options:
q.spoil()
q.add_criteria(
lambda q: q._conditional_options(*state.load_options))
if self.use_get:
return q(session)._load_on_ident(
session.query(self.mapper), ident_key)
if self.parent_property.order_by:
q.add_criteria(
lambda q:
q.order_by(*util.to_list(self.parent_property.order_by)))
for rev in self.parent_property._reverse_property:
# reverse props that are MANYTOONE are loading *this*
# object from get(), so don't need to eager out to those.
if rev.direction is interfaces.MANYTOONE and \
rev._use_get and \
not isinstance(rev.strategy, strategies.LazyLoader):
q.add_criteria(
lambda q:
q.options(
strategy_options.Load(
rev.parent).baked_lazyload(rev.key)))
lazy_clause, params = self._generate_lazy_clause(state, passive)
if pending:
if orm_util._none_set.intersection(params.values()):
return None
q.add_criteria(lambda q: q.filter(lazy_clause))
result = q(session).params(**params).all()
if self.uselist:
return result
else:
l = len(result)
if l:
if l > 1:
util.warn(
"Multiple rows returned with "
"uselist=False for lazily-loaded attribute '%s' "
% self.parent_property)
return result[0]
else:
return None
@strategy_options.loader_option()
def baked_lazyload(loadopt, attr):
"""Indicate that the given attribute should be loaded using "lazy"
loading with a "baked" query used in the load.
"""
return loadopt.set_relationship_strategy(attr, {"lazy": "baked_select"})
@baked_lazyload._add_unbound_fn
def baked_lazyload(*keys):
return strategy_options._UnboundLoad._from_keys(
strategy_options._UnboundLoad.baked_lazyload, keys, False, {})
@baked_lazyload._add_unbound_all_fn
def baked_lazyload_all(*keys):
return strategy_options._UnboundLoad._from_keys(
strategy_options._UnboundLoad.baked_lazyload, keys, True, {})
baked_lazyload = baked_lazyload._unbound_fn
baked_lazyload_all = baked_lazyload_all._unbound_all_fn
bakery = BakedQuery.bakery

14
lib/python3.5/site-packages/sqlalchemy/ext/compiler.py
View file

@ -1,5 +1,5 @@
# ext/compiler.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -121,9 +121,19 @@ below where we generate a CHECK constraint that embeds a SQL expression::
def compile_my_constraint(constraint, ddlcompiler, **kw):
return "CONSTRAINT %s CHECK (%s)" % (
constraint.name,
ddlcompiler.sql_compiler.process(constraint.expression)
ddlcompiler.sql_compiler.process(
constraint.expression, literal_binds=True)
)
Above, we add an additional flag to the process step as called by
:meth:`.SQLCompiler.process`, which is the ``literal_binds`` flag. This
indicates that any SQL expression which refers to a :class:`.BindParameter`
object or other "literal" object such as those which refer to strings or
integers should be rendered **in-place**, rather than being referred to as
a bound parameter; when emitting DDL, bound parameters are typically not
supported.
.. _enabling_compiled_autocommit:
Enabling Autocommit on a Construct

1303
lib/python3.5/site-packages/sqlalchemy/ext/declarative/__init__.py
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208
lib/python3.5/site-packages/sqlalchemy/ext/declarative/api.py
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@ -1,5 +1,5 @@
# ext/declarative/api.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -7,13 +7,14 @@
"""Public API functions and helpers for declarative."""
from ...schema import Table, MetaData
from ...orm import synonym as _orm_synonym, mapper,\
from ...schema import Table, MetaData, Column
from ...orm import synonym as _orm_synonym, \
comparable_property,\
interfaces, properties
interfaces, properties, attributes
from ...orm.util import polymorphic_union
from ...orm.base import _mapper_or_none
from ...util import OrderedDict
from ...util import OrderedDict, hybridmethod, hybridproperty
from ... import util
from ... import exc
import weakref
@ -21,7 +22,6 @@ from .base import _as_declarative, \
_declarative_constructor,\
_DeferredMapperConfig, _add_attribute
from .clsregistry import _class_resolver
from . import clsregistry
def instrument_declarative(cls, registry, metadata):
@ -157,12 +157,90 @@ class declared_attr(interfaces._MappedAttribute, property):
"""
def __init__(self, fget, *arg, **kw):
super(declared_attr, self).__init__(fget, *arg, **kw)
def __init__(self, fget, cascading=False):
super(declared_attr, self).__init__(fget)
self.__doc__ = fget.__doc__
self._cascading = cascading
def __get__(desc, self, cls):
return desc.fget(cls)
reg = cls.__dict__.get('_sa_declared_attr_reg', None)
if reg is None:
manager = attributes.manager_of_class(cls)
if manager is None:
util.warn(
"Unmanaged access of declarative attribute %s from "
"non-mapped class %s" %
(desc.fget.__name__, cls.__name__))
return desc.fget(cls)
if reg is None:
return desc.fget(cls)
elif desc in reg:
return reg[desc]
else:
reg[desc] = obj = desc.fget(cls)
return obj
@hybridmethod
def _stateful(cls, **kw):
return _stateful_declared_attr(**kw)
@hybridproperty
def cascading(cls):
"""Mark a :class:`.declared_attr` as cascading.
This is a special-use modifier which indicates that a column
or MapperProperty-based declared attribute should be configured
distinctly per mapped subclass, within a mapped-inheritance scenario.
Below, both MyClass as well as MySubClass will have a distinct
``id`` Column object established::
class HasSomeAttribute(object):
@declared_attr.cascading
def some_id(cls):
if has_inherited_table(cls):
return Column(
ForeignKey('myclass.id'), primary_key=True)
else:
return Column(Integer, primary_key=True)
return Column('id', Integer, primary_key=True)
class MyClass(HasSomeAttribute, Base):
""
# ...
class MySubClass(MyClass):
""
# ...
The behavior of the above configuration is that ``MySubClass``
will refer to both its own ``id`` column as well as that of
``MyClass`` underneath the attribute named ``some_id``.
.. seealso::
:ref:`declarative_inheritance`
:ref:`mixin_inheritance_columns`
"""
return cls._stateful(cascading=True)
class _stateful_declared_attr(declared_attr):
def __init__(self, **kw):
self.kw = kw
def _stateful(self, **kw):
new_kw = self.kw.copy()
new_kw.update(kw)
return _stateful_declared_attr(**new_kw)
def __call__(self, fn):
return declared_attr(fn, **self.kw)
def declarative_base(bind=None, metadata=None, mapper=None, cls=object,
@ -319,6 +397,15 @@ class ConcreteBase(object):
'polymorphic_identity':'manager',
'concrete':True}
.. seealso::
:class:`.AbstractConcreteBase`
:ref:`concrete_inheritance`
:ref:`inheritance_concrete_helpers`
"""
@classmethod
@ -349,9 +436,11 @@ class AbstractConcreteBase(ConcreteBase):
``__declare_last__()`` function, which is essentially
a hook for the :meth:`.after_configured` event.
:class:`.AbstractConcreteBase` does not produce a mapped
table for the class itself. Compare to :class:`.ConcreteBase`,
which does.
:class:`.AbstractConcreteBase` does produce a mapped class
for the base class, however it is not persisted to any table; it
is instead mapped directly to the "polymorphic" selectable directly
and is only used for selecting. Compare to :class:`.ConcreteBase`,
which does create a persisted table for the base class.
Example::
@ -365,20 +454,79 @@ class AbstractConcreteBase(ConcreteBase):
employee_id = Column(Integer, primary_key=True)
name = Column(String(50))
manager_data = Column(String(40))
__mapper_args__ = {
'polymorphic_identity':'manager',
'concrete':True}
'polymorphic_identity':'manager',
'concrete':True}
The abstract base class is handled by declarative in a special way;
at class configuration time, it behaves like a declarative mixin
or an ``__abstract__`` base class. Once classes are configured
and mappings are produced, it then gets mapped itself, but
after all of its decscendants. This is a very unique system of mapping
not found in any other SQLAlchemy system.
Using this approach, we can specify columns and properties
that will take place on mapped subclasses, in the way that
we normally do as in :ref:`declarative_mixins`::
class Company(Base):
__tablename__ = 'company'
id = Column(Integer, primary_key=True)
class Employee(AbstractConcreteBase, Base):
employee_id = Column(Integer, primary_key=True)
@declared_attr
def company_id(cls):
return Column(ForeignKey('company.id'))
@declared_attr
def company(cls):
return relationship("Company")
class Manager(Employee):
__tablename__ = 'manager'
name = Column(String(50))
manager_data = Column(String(40))
__mapper_args__ = {
'polymorphic_identity':'manager',
'concrete':True}
When we make use of our mappings however, both ``Manager`` and
``Employee`` will have an independently usable ``.company`` attribute::
session.query(Employee).filter(Employee.company.has(id=5))
.. versionchanged:: 1.0.0 - The mechanics of :class:`.AbstractConcreteBase`
have been reworked to support relationships established directly
on the abstract base, without any special configurational steps.
.. seealso::
:class:`.ConcreteBase`
:ref:`concrete_inheritance`
:ref:`inheritance_concrete_helpers`
"""
__abstract__ = True
__no_table__ = True
@classmethod
def __declare_first__(cls):
if hasattr(cls, '__mapper__'):
cls._sa_decl_prepare_nocascade()
@classmethod
def _sa_decl_prepare_nocascade(cls):
if getattr(cls, '__mapper__', None):
return
clsregistry.add_class(cls.__name__, cls)
to_map = _DeferredMapperConfig.config_for_cls(cls)
# can't rely on 'self_and_descendants' here
# since technically an immediate subclass
# might not be mapped, but a subclass
@ -392,11 +540,33 @@ class AbstractConcreteBase(ConcreteBase):
if mn is not None:
mappers.append(mn)
pjoin = cls._create_polymorphic_union(mappers)
cls.__mapper__ = m = mapper(cls, pjoin, polymorphic_on=pjoin.c.type)
# For columns that were declared on the class, these
# are normally ignored with the "__no_table__" mapping,
# unless they have a different attribute key vs. col name
# and are in the properties argument.
# In that case, ensure we update the properties entry
# to the correct column from the pjoin target table.
declared_cols = set(to_map.declared_columns)
for k, v in list(to_map.properties.items()):
if v in declared_cols:
to_map.properties[k] = pjoin.c[v.key]
to_map.local_table = pjoin
m_args = to_map.mapper_args_fn or dict
def mapper_args():
args = m_args()
args['polymorphic_on'] = pjoin.c.type
return args
to_map.mapper_args_fn = mapper_args
m = to_map.map()
for scls in cls.__subclasses__():
sm = _mapper_or_none(scls)
if sm.concrete and cls in scls.__bases__:
if sm and sm.concrete and cls in scls.__bases__:
sm._set_concrete_base(m)

731
lib/python3.5/site-packages/sqlalchemy/ext/declarative/base.py
View file

@ -1,5 +1,5 @@
# ext/declarative/base.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -19,6 +19,9 @@ from ... import event
from . import clsregistry
import collections
import weakref
from sqlalchemy.orm import instrumentation
declared_attr = declarative_props = None
def _declared_mapping_info(cls):
@ -32,322 +35,431 @@ def _declared_mapping_info(cls):
return None
def _as_declarative(cls, classname, dict_):
from .api import declared_attr
def _resolve_for_abstract(cls):
if cls is object:
return None
# dict_ will be a dictproxy, which we can't write to, and we need to!
dict_ = dict(dict_)
if _get_immediate_cls_attr(cls, '__abstract__', strict=True):
for sup in cls.__bases__:
sup = _resolve_for_abstract(sup)
if sup is not None:
return sup
else:
return None
else:
return cls
column_copies = {}
potential_columns = {}
mapper_args_fn = None
table_args = inherited_table_args = None
tablename = None
def _get_immediate_cls_attr(cls, attrname, strict=False):
"""return an attribute of the class that is either present directly
on the class, e.g. not on a superclass, or is from a superclass but
this superclass is a mixin, that is, not a descendant of
the declarative base.
declarative_props = (declared_attr, util.classproperty)
This is used to detect attributes that indicate something about
a mapped class independently from any mapped classes that it may
inherit from.
"""
if not issubclass(cls, object):
return None
for base in cls.__mro__:
_is_declarative_inherits = hasattr(base, '_decl_class_registry')
if '__declare_last__' in base.__dict__:
@event.listens_for(mapper, "after_configured")
def go():
cls.__declare_last__()
if '__declare_first__' in base.__dict__:
@event.listens_for(mapper, "before_configured")
def go():
cls.__declare_first__()
if '__abstract__' in base.__dict__ and base.__abstract__:
if (base is cls or
(base in cls.__bases__ and not _is_declarative_inherits)):
return
class_mapped = _declared_mapping_info(base) is not None
for name, obj in vars(base).items():
if name == '__mapper_args__':
if not mapper_args_fn and (
not class_mapped or
isinstance(obj, declarative_props)
):
# don't even invoke __mapper_args__ until
# after we've determined everything about the
# mapped table.
# make a copy of it so a class-level dictionary
# is not overwritten when we update column-based
# arguments.
mapper_args_fn = lambda: dict(cls.__mapper_args__)
elif name == '__tablename__':
if not tablename and (
not class_mapped or
isinstance(obj, declarative_props)
):
tablename = cls.__tablename__
elif name == '__table_args__':
if not table_args and (
not class_mapped or
isinstance(obj, declarative_props)
):
table_args = cls.__table_args__
if not isinstance(table_args, (tuple, dict, type(None))):
raise exc.ArgumentError(
"__table_args__ value must be a tuple, "
"dict, or None")
if base is not cls:
inherited_table_args = True
elif class_mapped:
if isinstance(obj, declarative_props):
util.warn("Regular (i.e. not __special__) "
"attribute '%s.%s' uses @declared_attr, "
"but owning class %s is mapped - "
"not applying to subclass %s."
% (base.__name__, name, base, cls))
continue
elif base is not cls:
# we're a mixin.
if isinstance(obj, Column):
if getattr(cls, name) is not obj:
# if column has been overridden
# (like by the InstrumentedAttribute of the
# superclass), skip
continue
if obj.foreign_keys:
raise exc.InvalidRequestError(
"Columns with foreign keys to other columns "
"must be declared as @declared_attr callables "
"on declarative mixin classes. ")
if name not in dict_ and not (
'__table__' in dict_ and
(obj.name or name) in dict_['__table__'].c
) and name not in potential_columns:
potential_columns[name] = \
column_copies[obj] = \
obj.copy()
column_copies[obj]._creation_order = \
obj._creation_order
elif isinstance(obj, MapperProperty):
raise exc.InvalidRequestError(
"Mapper properties (i.e. deferred,"
"column_property(), relationship(), etc.) must "
"be declared as @declared_attr callables "
"on declarative mixin classes.")
elif isinstance(obj, declarative_props):
dict_[name] = ret = \
column_copies[obj] = getattr(cls, name)
if isinstance(ret, (Column, MapperProperty)) and \
ret.doc is None:
ret.doc = obj.__doc__
# apply inherited columns as we should
for k, v in potential_columns.items():
dict_[k] = v
if inherited_table_args and not tablename:
table_args = None
clsregistry.add_class(classname, cls)
our_stuff = util.OrderedDict()
for k in list(dict_):
# TODO: improve this ? all dunders ?
if k in ('__table__', '__tablename__', '__mapper_args__'):
continue
value = dict_[k]
if isinstance(value, declarative_props):
value = getattr(cls, k)
elif isinstance(value, QueryableAttribute) and \
value.class_ is not cls and \
value.key != k:
# detect a QueryableAttribute that's already mapped being
# assigned elsewhere in userland, turn into a synonym()
value = synonym(value.key)
setattr(cls, k, value)
if (isinstance(value, tuple) and len(value) == 1 and
isinstance(value[0], (Column, MapperProperty))):
util.warn("Ignoring declarative-like tuple value of attribute "
"%s: possibly a copy-and-paste error with a comma "
"left at the end of the line?" % k)
continue
if not isinstance(value, (Column, MapperProperty)):
if not k.startswith('__'):
dict_.pop(k)
setattr(cls, k, value)
continue
if k == 'metadata':
raise exc.InvalidRequestError(
"Attribute name 'metadata' is reserved "
"for the MetaData instance when using a "
"declarative base class."
)
prop = clsregistry._deferred_relationship(cls, value)
our_stuff[k] = prop
# set up attributes in the order they were created
our_stuff.sort(key=lambda key: our_stuff[key]._creation_order)
# extract columns from the class dict
declared_columns = set()
name_to_prop_key = collections.defaultdict(set)
for key, c in list(our_stuff.items()):
if isinstance(c, (ColumnProperty, CompositeProperty)):
for col in c.columns:
if isinstance(col, Column) and \
col.table is None:
_undefer_column_name(key, col)
if not isinstance(c, CompositeProperty):
name_to_prop_key[col.name].add(key)
declared_columns.add(col)
elif isinstance(c, Column):
_undefer_column_name(key, c)
name_to_prop_key[c.name].add(key)
declared_columns.add(c)
# if the column is the same name as the key,
# remove it from the explicit properties dict.
# the normal rules for assigning column-based properties
# will take over, including precedence of columns
# in multi-column ColumnProperties.
if key == c.key:
del our_stuff[key]
for name, keys in name_to_prop_key.items():
if len(keys) > 1:
util.warn(
"On class %r, Column object %r named directly multiple times, "
"only one will be used: %s" %
(classname, name, (", ".join(sorted(keys))))
)
declared_columns = sorted(
declared_columns, key=lambda c: c._creation_order)
table = None
if hasattr(cls, '__table_cls__'):
table_cls = util.unbound_method_to_callable(cls.__table_cls__)
if attrname in base.__dict__ and (
base is cls or
((base in cls.__bases__ if strict else True)
and not _is_declarative_inherits)
):
return getattr(base, attrname)
else:
table_cls = Table
return None
if '__table__' not in dict_:
if tablename is not None:
args, table_kw = (), {}
if table_args:
if isinstance(table_args, dict):
table_kw = table_args
elif isinstance(table_args, tuple):
if isinstance(table_args[-1], dict):
args, table_kw = table_args[0:-1], table_args[-1]
else:
args = table_args
def _as_declarative(cls, classname, dict_):
global declared_attr, declarative_props
if declared_attr is None:
from .api import declared_attr
declarative_props = (declared_attr, util.classproperty)
autoload = dict_.get('__autoload__')
if autoload:
table_kw['autoload'] = True
if _get_immediate_cls_attr(cls, '__abstract__', strict=True):
return
cls.__table__ = table = table_cls(
tablename, cls.metadata,
*(tuple(declared_columns) + tuple(args)),
**table_kw)
else:
table = cls.__table__
if declared_columns:
for c in declared_columns:
if not table.c.contains_column(c):
raise exc.ArgumentError(
"Can't add additional column %r when "
"specifying __table__" % c.key
)
if hasattr(cls, '__mapper_cls__'):
mapper_cls = util.unbound_method_to_callable(cls.__mapper_cls__)
else:
mapper_cls = mapper
for c in cls.__bases__:
if _declared_mapping_info(c) is not None:
inherits = c
break
else:
inherits = None
if table is None and inherits is None:
raise exc.InvalidRequestError(
"Class %r does not have a __table__ or __tablename__ "
"specified and does not inherit from an existing "
"table-mapped class." % cls
)
elif inherits:
inherited_mapper = _declared_mapping_info(inherits)
inherited_table = inherited_mapper.local_table
inherited_mapped_table = inherited_mapper.mapped_table
if table is None:
# single table inheritance.
# ensure no table args
if table_args:
raise exc.ArgumentError(
"Can't place __table_args__ on an inherited class "
"with no table."
)
# add any columns declared here to the inherited table.
for c in declared_columns:
if c.primary_key:
raise exc.ArgumentError(
"Can't place primary key columns on an inherited "
"class with no table."
)
if c.name in inherited_table.c:
if inherited_table.c[c.name] is c:
continue
raise exc.ArgumentError(
"Column '%s' on class %s conflicts with "
"existing column '%s'" %
(c, cls, inherited_table.c[c.name])
)
inherited_table.append_column(c)
if inherited_mapped_table is not None and \
inherited_mapped_table is not inherited_table:
inherited_mapped_table._refresh_for_new_column(c)
defer_map = hasattr(cls, '_sa_decl_prepare')
if defer_map:
cfg_cls = _DeferredMapperConfig
else:
cfg_cls = _MapperConfig
mt = cfg_cls(mapper_cls,
cls, table,
inherits,
declared_columns,
column_copies,
our_stuff,
mapper_args_fn)
if not defer_map:
mt.map()
_MapperConfig.setup_mapping(cls, classname, dict_)
class _MapperConfig(object):
mapped_table = None
@classmethod
def setup_mapping(cls, cls_, classname, dict_):
defer_map = _get_immediate_cls_attr(
cls_, '_sa_decl_prepare_nocascade', strict=True) or \
hasattr(cls_, '_sa_decl_prepare')
def __init__(self, mapper_cls,
cls,
table,
inherits,
declared_columns,
column_copies,
properties, mapper_args_fn):
self.mapper_cls = mapper_cls
self.cls = cls
self.local_table = table
self.inherits = inherits
self.properties = properties
if defer_map:
cfg_cls = _DeferredMapperConfig
else:
cfg_cls = _MapperConfig
cfg_cls(cls_, classname, dict_)
def __init__(self, cls_, classname, dict_):
self.cls = cls_
# dict_ will be a dictproxy, which we can't write to, and we need to!
self.dict_ = dict(dict_)
self.classname = classname
self.mapped_table = None
self.properties = util.OrderedDict()
self.declared_columns = set()
self.column_copies = {}
self._setup_declared_events()
# temporary registry. While early 1.0 versions
# set up the ClassManager here, by API contract
# we can't do that until there's a mapper.
self.cls._sa_declared_attr_reg = {}
self._scan_attributes()
clsregistry.add_class(self.classname, self.cls)
self._extract_mappable_attributes()
self._extract_declared_columns()
self._setup_table()
self._setup_inheritance()
self._early_mapping()
def _early_mapping(self):
self.map()
def _setup_declared_events(self):
if _get_immediate_cls_attr(self.cls, '__declare_last__'):
@event.listens_for(mapper, "after_configured")
def after_configured():
self.cls.__declare_last__()
if _get_immediate_cls_attr(self.cls, '__declare_first__'):
@event.listens_for(mapper, "before_configured")
def before_configured():
self.cls.__declare_first__()
def _scan_attributes(self):
cls = self.cls
dict_ = self.dict_
column_copies = self.column_copies
mapper_args_fn = None
table_args = inherited_table_args = None
tablename = None
for base in cls.__mro__:
class_mapped = base is not cls and \
_declared_mapping_info(base) is not None and \
not _get_immediate_cls_attr(
base, '_sa_decl_prepare_nocascade', strict=True)
if not class_mapped and base is not cls:
self._produce_column_copies(base)
for name, obj in vars(base).items():
if name == '__mapper_args__':
if not mapper_args_fn and (
not class_mapped or
isinstance(obj, declarative_props)
):
# don't even invoke __mapper_args__ until
# after we've determined everything about the
# mapped table.
# make a copy of it so a class-level dictionary
# is not overwritten when we update column-based
# arguments.
mapper_args_fn = lambda: dict(cls.__mapper_args__)
elif name == '__tablename__':
if not tablename and (
not class_mapped or
isinstance(obj, declarative_props)
):
tablename = cls.__tablename__
elif name == '__table_args__':
if not table_args and (
not class_mapped or
isinstance(obj, declarative_props)
):
table_args = cls.__table_args__
if not isinstance(
table_args, (tuple, dict, type(None))):
raise exc.ArgumentError(
"__table_args__ value must be a tuple, "
"dict, or None")
if base is not cls:
inherited_table_args = True
elif class_mapped:
if isinstance(obj, declarative_props):
util.warn("Regular (i.e. not __special__) "
"attribute '%s.%s' uses @declared_attr, "
"but owning class %s is mapped - "
"not applying to subclass %s."
% (base.__name__, name, base, cls))
continue
elif base is not cls:
# we're a mixin, abstract base, or something that is
# acting like that for now.
if isinstance(obj, Column):
# already copied columns to the mapped class.
continue
elif isinstance(obj, MapperProperty):
raise exc.InvalidRequestError(
"Mapper properties (i.e. deferred,"
"column_property(), relationship(), etc.) must "
"be declared as @declared_attr callables "
"on declarative mixin classes.")
elif isinstance(obj, declarative_props):
oldclassprop = isinstance(obj, util.classproperty)
if not oldclassprop and obj._cascading:
dict_[name] = column_copies[obj] = \
ret = obj.__get__(obj, cls)
setattr(cls, name, ret)
else:
if oldclassprop:
util.warn_deprecated(
"Use of sqlalchemy.util.classproperty on "
"declarative classes is deprecated.")
dict_[name] = column_copies[obj] = \
ret = getattr(cls, name)
if isinstance(ret, (Column, MapperProperty)) and \
ret.doc is None:
ret.doc = obj.__doc__
if inherited_table_args and not tablename:
table_args = None
self.table_args = table_args
self.tablename = tablename
self.mapper_args_fn = mapper_args_fn
self.declared_columns = declared_columns
self.column_copies = column_copies
def _produce_column_copies(self, base):
cls = self.cls
dict_ = self.dict_
column_copies = self.column_copies
# copy mixin columns to the mapped class
for name, obj in vars(base).items():
if isinstance(obj, Column):
if getattr(cls, name) is not obj:
# if column has been overridden
# (like by the InstrumentedAttribute of the
# superclass), skip
continue
elif obj.foreign_keys:
raise exc.InvalidRequestError(
"Columns with foreign keys to other columns "
"must be declared as @declared_attr callables "
"on declarative mixin classes. ")
elif name not in dict_ and not (
'__table__' in dict_ and
(obj.name or name) in dict_['__table__'].c
):
column_copies[obj] = copy_ = obj.copy()
copy_._creation_order = obj._creation_order
setattr(cls, name, copy_)
dict_[name] = copy_
def _extract_mappable_attributes(self):
cls = self.cls
dict_ = self.dict_
our_stuff = self.properties
for k in list(dict_):
if k in ('__table__', '__tablename__', '__mapper_args__'):
continue
value = dict_[k]
if isinstance(value, declarative_props):
value = getattr(cls, k)
elif isinstance(value, QueryableAttribute) and \
value.class_ is not cls and \
value.key != k:
# detect a QueryableAttribute that's already mapped being
# assigned elsewhere in userland, turn into a synonym()
value = synonym(value.key)
setattr(cls, k, value)
if (isinstance(value, tuple) and len(value) == 1 and
isinstance(value[0], (Column, MapperProperty))):
util.warn("Ignoring declarative-like tuple value of attribute "
"%s: possibly a copy-and-paste error with a comma "
"left at the end of the line?" % k)
continue
elif not isinstance(value, (Column, MapperProperty)):
# using @declared_attr for some object that
# isn't Column/MapperProperty; remove from the dict_
# and place the evaluated value onto the class.
if not k.startswith('__'):
dict_.pop(k)
setattr(cls, k, value)
continue
# we expect to see the name 'metadata' in some valid cases;
# however at this point we see it's assigned to something trying
# to be mapped, so raise for that.
elif k == 'metadata':
raise exc.InvalidRequestError(
"Attribute name 'metadata' is reserved "
"for the MetaData instance when using a "
"declarative base class."
)
prop = clsregistry._deferred_relationship(cls, value)
our_stuff[k] = prop
def _extract_declared_columns(self):
our_stuff = self.properties
# set up attributes in the order they were created
our_stuff.sort(key=lambda key: our_stuff[key]._creation_order)
# extract columns from the class dict
declared_columns = self.declared_columns
name_to_prop_key = collections.defaultdict(set)
for key, c in list(our_stuff.items()):
if isinstance(c, (ColumnProperty, CompositeProperty)):
for col in c.columns:
if isinstance(col, Column) and \
col.table is None:
_undefer_column_name(key, col)
if not isinstance(c, CompositeProperty):
name_to_prop_key[col.name].add(key)
declared_columns.add(col)
elif isinstance(c, Column):
_undefer_column_name(key, c)
name_to_prop_key[c.name].add(key)
declared_columns.add(c)
# if the column is the same name as the key,
# remove it from the explicit properties dict.
# the normal rules for assigning column-based properties
# will take over, including precedence of columns
# in multi-column ColumnProperties.
if key == c.key:
del our_stuff[key]
for name, keys in name_to_prop_key.items():
if len(keys) > 1:
util.warn(
"On class %r, Column object %r named "
"directly multiple times, "
"only one will be used: %s" %
(self.classname, name, (", ".join(sorted(keys))))
)
def _setup_table(self):
cls = self.cls
tablename = self.tablename
table_args = self.table_args
dict_ = self.dict_
declared_columns = self.declared_columns
declared_columns = self.declared_columns = sorted(
declared_columns, key=lambda c: c._creation_order)
table = None
if hasattr(cls, '__table_cls__'):
table_cls = util.unbound_method_to_callable(cls.__table_cls__)
else:
table_cls = Table
if '__table__' not in dict_:
if tablename is not None:
args, table_kw = (), {}
if table_args:
if isinstance(table_args, dict):
table_kw = table_args
elif isinstance(table_args, tuple):
if isinstance(table_args[-1], dict):
args, table_kw = table_args[0:-1], table_args[-1]
else:
args = table_args
autoload = dict_.get('__autoload__')
if autoload:
table_kw['autoload'] = True
cls.__table__ = table = table_cls(
tablename, cls.metadata,
*(tuple(declared_columns) + tuple(args)),
**table_kw)
else:
table = cls.__table__
if declared_columns:
for c in declared_columns:
if not table.c.contains_column(c):
raise exc.ArgumentError(
"Can't add additional column %r when "
"specifying __table__" % c.key
)
self.local_table = table
def _setup_inheritance(self):
table = self.local_table
cls = self.cls
table_args = self.table_args
declared_columns = self.declared_columns
for c in cls.__bases__:
c = _resolve_for_abstract(c)
if c is None:
continue
if _declared_mapping_info(c) is not None and \
not _get_immediate_cls_attr(
c, '_sa_decl_prepare_nocascade', strict=True):
self.inherits = c
break
else:
self.inherits = None
if table is None and self.inherits is None and \
not _get_immediate_cls_attr(cls, '__no_table__'):
raise exc.InvalidRequestError(
"Class %r does not have a __table__ or __tablename__ "
"specified and does not inherit from an existing "
"table-mapped class." % cls
)
elif self.inherits:
inherited_mapper = _declared_mapping_info(self.inherits)
inherited_table = inherited_mapper.local_table
inherited_mapped_table = inherited_mapper.mapped_table
if table is None:
# single table inheritance.
# ensure no table args
if table_args:
raise exc.ArgumentError(
"Can't place __table_args__ on an inherited class "
"with no table."
)
# add any columns declared here to the inherited table.
for c in declared_columns:
if c.primary_key:
raise exc.ArgumentError(
"Can't place primary key columns on an inherited "
"class with no table."
)
if c.name in inherited_table.c:
if inherited_table.c[c.name] is c:
continue
raise exc.ArgumentError(
"Column '%s' on class %s conflicts with "
"existing column '%s'" %
(c, cls, inherited_table.c[c.name])
)
inherited_table.append_column(c)
if inherited_mapped_table is not None and \
inherited_mapped_table is not inherited_table:
inherited_mapped_table._refresh_for_new_column(c)
def _prepare_mapper_arguments(self):
properties = self.properties
@ -401,20 +513,31 @@ class _MapperConfig(object):
properties[k] = [col] + p.columns
result_mapper_args = mapper_args.copy()
result_mapper_args['properties'] = properties
return result_mapper_args
self.mapper_args = result_mapper_args
def map(self):
mapper_args = self._prepare_mapper_arguments()
self.cls.__mapper__ = self.mapper_cls(
self._prepare_mapper_arguments()
if hasattr(self.cls, '__mapper_cls__'):
mapper_cls = util.unbound_method_to_callable(
self.cls.__mapper_cls__)
else:
mapper_cls = mapper
self.cls.__mapper__ = mp_ = mapper_cls(
self.cls,
self.local_table,
**mapper_args
**self.mapper_args
)
del self.cls._sa_declared_attr_reg
return mp_
class _DeferredMapperConfig(_MapperConfig):
_configs = util.OrderedDict()
def _early_mapping(self):
pass
@property
def cls(self):
return self._cls()
@ -466,7 +589,7 @@ class _DeferredMapperConfig(_MapperConfig):
def map(self):
self._configs.pop(self._cls, None)
super(_DeferredMapperConfig, self).map()
return super(_DeferredMapperConfig, self).map()
def _add_attribute(cls, key, value):

22
lib/python3.5/site-packages/sqlalchemy/ext/declarative/clsregistry.py
View file

@ -1,5 +1,5 @@
# ext/declarative/clsregistry.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -71,6 +71,8 @@ class _MultipleClassMarker(object):
"""
__slots__ = 'on_remove', 'contents', '__weakref__'
def __init__(self, classes, on_remove=None):
self.on_remove = on_remove
self.contents = set([
@ -103,7 +105,12 @@ class _MultipleClassMarker(object):
self.on_remove()
def add_item(self, item):
modules = set([cls().__module__ for cls in self.contents])
# protect against class registration race condition against
# asynchronous garbage collection calling _remove_item,
# [ticket:3208]
modules = set([
cls.__module__ for cls in
[ref() for ref in self.contents] if cls is not None])
if item.__module__ in modules:
util.warn(
"This declarative base already contains a class with the "
@ -122,6 +129,8 @@ class _ModuleMarker(object):
"""
__slots__ = 'parent', 'name', 'contents', 'mod_ns', 'path', '__weakref__'
def __init__(self, name, parent):
self.parent = parent
self.name = name
@ -167,6 +176,8 @@ class _ModuleMarker(object):
class _ModNS(object):
__slots__ = '__parent',
def __init__(self, parent):
self.__parent = parent
@ -188,6 +199,8 @@ class _ModNS(object):
class _GetColumns(object):
__slots__ = 'cls',
def __init__(self, cls):
self.cls = cls
@ -216,6 +229,8 @@ inspection._inspects(_GetColumns)(
class _GetTable(object):
__slots__ = 'key', 'metadata'
def __init__(self, key, metadata):
self.key = key
self.metadata = metadata
@ -306,7 +321,8 @@ def _deferred_relationship(cls, prop):
key, kwargs = prop.backref
for attr in ('primaryjoin', 'secondaryjoin', 'secondary',
'foreign_keys', 'remote_side', 'order_by'):
if attr in kwargs and isinstance(kwargs[attr], str):
if attr in kwargs and isinstance(kwargs[attr],
util.string_types):
kwargs[attr] = resolve_arg(kwargs[attr])
return prop

2
lib/python3.5/site-packages/sqlalchemy/ext/horizontal_shard.py
View file

@ -1,5 +1,5 @@
# ext/horizontal_shard.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under

20
lib/python3.5/site-packages/sqlalchemy/ext/hybrid.py
View file

@ -1,5 +1,5 @@
# ext/hybrid.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -45,8 +45,8 @@ as the class itself::
return self.end - self.start
@hybrid_method
def contains(self,point):
return (self.start <= point) & (point < self.end)
def contains(self, point):
return (self.start <= point) & (point <= self.end)
@hybrid_method
def intersects(self, other):
@ -145,7 +145,7 @@ usage of the absolute value function::
return func.abs(cls.length) / 2
Above the Python function ``abs()`` is used for instance-level
operations, the SQL function ``ABS()`` is used via the :attr:`.func`
operations, the SQL function ``ABS()`` is used via the :data:`.func`
object for class-level expressions::
>>> i1.radius
@ -634,10 +634,10 @@ from .. import util
from ..orm import attributes, interfaces
HYBRID_METHOD = util.symbol('HYBRID_METHOD')
"""Symbol indicating an :class:`_InspectionAttr` that's
"""Symbol indicating an :class:`InspectionAttr` that's
of type :class:`.hybrid_method`.
Is assigned to the :attr:`._InspectionAttr.extension_type`
Is assigned to the :attr:`.InspectionAttr.extension_type`
attibute.
.. seealso::
@ -647,10 +647,10 @@ HYBRID_METHOD = util.symbol('HYBRID_METHOD')
"""
HYBRID_PROPERTY = util.symbol('HYBRID_PROPERTY')
"""Symbol indicating an :class:`_InspectionAttr` that's
"""Symbol indicating an :class:`InspectionAttr` that's
of type :class:`.hybrid_method`.
Is assigned to the :attr:`._InspectionAttr.extension_type`
Is assigned to the :attr:`.InspectionAttr.extension_type`
attibute.
.. seealso::
@ -660,7 +660,7 @@ HYBRID_PROPERTY = util.symbol('HYBRID_PROPERTY')
"""
class hybrid_method(interfaces._InspectionAttr):
class hybrid_method(interfaces.InspectionAttrInfo):
"""A decorator which allows definition of a Python object method with both
instance-level and class-level behavior.
@ -703,7 +703,7 @@ class hybrid_method(interfaces._InspectionAttr):
return self
class hybrid_property(interfaces._InspectionAttr):
class hybrid_property(interfaces.InspectionAttrInfo):
"""A decorator which allows definition of a Python descriptor with both
instance-level and class-level behavior.

9
lib/python3.5/site-packages/sqlalchemy/ext/instrumentation.py
View file

@ -166,7 +166,13 @@ class ExtendedInstrumentationRegistry(InstrumentationFactory):
def manager_of_class(self, cls):
if cls is None:
return None
return self._manager_finders.get(cls, _default_manager_getter)(cls)
try:
finder = self._manager_finders.get(cls, _default_manager_getter)
except TypeError:
# due to weakref lookup on invalid object
return None
else:
return finder(cls)
def state_of(self, instance):
if instance is None:
@ -392,6 +398,7 @@ def _reinstall_default_lookups():
manager_of_class=_default_manager_getter
)
)
_instrumentation_factory._extended = False
def _install_lookups(lookups):

69
lib/python3.5/site-packages/sqlalchemy/ext/mutable.py
View file

@ -1,5 +1,5 @@
# ext/mutable.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -402,6 +402,27 @@ class MutableBase(object):
msg = "Attribute '%s' does not accept objects of type %s"
raise ValueError(msg % (key, type(value)))
@classmethod
def _get_listen_keys(cls, attribute):
"""Given a descriptor attribute, return a ``set()`` of the attribute
keys which indicate a change in the state of this attribute.
This is normally just ``set([attribute.key])``, but can be overridden
to provide for additional keys. E.g. a :class:`.MutableComposite`
augments this set with the attribute keys associated with the columns
that comprise the composite value.
This collection is consulted in the case of intercepting the
:meth:`.InstanceEvents.refresh` and
:meth:`.InstanceEvents.refresh_flush` events, which pass along a list
of attribute names that have been refreshed; the list is compared
against this set to determine if action needs to be taken.
.. versionadded:: 1.0.5
"""
return set([attribute.key])
@classmethod
def _listen_on_attribute(cls, attribute, coerce, parent_cls):
"""Establish this type as a mutation listener for the given
@ -415,6 +436,8 @@ class MutableBase(object):
# rely on "propagate" here
parent_cls = attribute.class_
listen_keys = cls._get_listen_keys(attribute)
def load(state, *args):
"""Listen for objects loaded or refreshed.
@ -429,6 +452,10 @@ class MutableBase(object):
state.dict[key] = val
val._parents[state.obj()] = key
def load_attrs(state, ctx, attrs):
if not attrs or listen_keys.intersection(attrs):
load(state)
def set(target, value, oldvalue, initiator):
"""Listen for set/replace events on the target
data member.
@ -463,7 +490,9 @@ class MutableBase(object):
event.listen(parent_cls, 'load', load,
raw=True, propagate=True)
event.listen(parent_cls, 'refresh', load,
event.listen(parent_cls, 'refresh', load_attrs,
raw=True, propagate=True)
event.listen(parent_cls, 'refresh_flush', load_attrs,
raw=True, propagate=True)
event.listen(attribute, 'set', set,
raw=True, retval=True, propagate=True)
@ -574,6 +603,10 @@ class MutableComposite(MutableBase):
"""
@classmethod
def _get_listen_keys(cls, attribute):
return set([attribute.key]).union(attribute.property._attribute_keys)
def changed(self):
"""Subclasses should call this method whenever change events occur."""
@ -602,6 +635,18 @@ _setup_composite_listener()
class MutableDict(Mutable, dict):
"""A dictionary type that implements :class:`.Mutable`.
The :class:`.MutableDict` object implements a dictionary that will
emit change events to the underlying mapping when the contents of
the dictionary are altered, including when values are added or removed.
Note that :class:`.MutableDict` does **not** apply mutable tracking to the
*values themselves* inside the dictionary. Therefore it is not a sufficient
solution for the use case of tracking deep changes to a *recursive*
dictionary structure, such as a JSON structure. To support this use case,
build a subclass of :class:`.MutableDict` that provides appropriate
coersion to the values placed in the dictionary so that they too are
"mutable", and emit events up to their parent structure.
.. versionadded:: 0.8
"""
@ -621,16 +666,30 @@ class MutableDict(Mutable, dict):
dict.__delitem__(self, key)
self.changed()
def update(self, *a, **kw):
dict.update(self, *a, **kw)
self.changed()
def pop(self, *arg):
result = dict.pop(self, *arg)
self.changed()
return result
def popitem(self):
result = dict.popitem(self)
self.changed()
return result
def clear(self):
dict.clear(self)
self.changed()
@classmethod
def coerce(cls, key, value):
"""Convert plain dictionary to MutableDict."""
if not isinstance(value, MutableDict):
"""Convert plain dictionary to instance of this class."""
if not isinstance(value, cls):
if isinstance(value, dict):
return MutableDict(value)
return cls(value)
return Mutable.coerce(key, value)
else:
return value

9
lib/python3.5/site-packages/sqlalchemy/ext/orderinglist.py
View file

@ -1,5 +1,5 @@
# ext/orderinglist.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
@ -119,7 +119,7 @@ start numbering at 1 or some other integer, provide ``count_from=1``.
"""
from ..orm.collections import collection
from ..orm.collections import collection, collection_adapter
from .. import util
__all__ = ['ordering_list']
@ -319,7 +319,10 @@ class OrderingList(list):
def remove(self, entity):
super(OrderingList, self).remove(entity)
self._reorder()
adapter = collection_adapter(self)
if adapter and adapter._referenced_by_owner:
self._reorder()
def pop(self, index=-1):
entity = super(OrderingList, self).pop(index)

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