184 lines
6.2 KiB
Python
184 lines
6.2 KiB
Python
# firebird/kinterbasdb.py
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# Copyright (C) 2005-2015 the SQLAlchemy authors and contributors
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# <see AUTHORS file>
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: http://www.opensource.org/licenses/mit-license.php
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"""
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.. dialect:: firebird+kinterbasdb
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:name: kinterbasdb
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:dbapi: kinterbasdb
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:connectstring: firebird+kinterbasdb://user:password@host:port/path/to/db\
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[?key=value&key=value...]
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:url: http://firebirdsql.org/index.php?op=devel&sub=python
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Arguments
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----------
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The Kinterbasdb backend accepts the ``enable_rowcount`` and ``retaining``
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arguments accepted by the :mod:`sqlalchemy.dialects.firebird.fdb` dialect.
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In addition, it also accepts the following:
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* ``type_conv`` - select the kind of mapping done on the types: by default
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SQLAlchemy uses 200 with Unicode, datetime and decimal support. See
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the linked documents below for further information.
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* ``concurrency_level`` - set the backend policy with regards to threading
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issues: by default SQLAlchemy uses policy 1. See the linked documents
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below for further information.
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.. seealso::
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http://sourceforge.net/projects/kinterbasdb
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http://kinterbasdb.sourceforge.net/dist_docs/usage.html#adv_param_conv_dynamic_type_translation
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http://kinterbasdb.sourceforge.net/dist_docs/usage.html#special_issue_concurrency
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"""
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from .base import FBDialect, FBExecutionContext
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from ... import util, types as sqltypes
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from re import match
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import decimal
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class _kinterbasdb_numeric(object):
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def bind_processor(self, dialect):
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def process(value):
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if isinstance(value, decimal.Decimal):
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return str(value)
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else:
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return value
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return process
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class _FBNumeric_kinterbasdb(_kinterbasdb_numeric, sqltypes.Numeric):
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pass
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class _FBFloat_kinterbasdb(_kinterbasdb_numeric, sqltypes.Float):
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pass
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class FBExecutionContext_kinterbasdb(FBExecutionContext):
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@property
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def rowcount(self):
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if self.execution_options.get('enable_rowcount',
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self.dialect.enable_rowcount):
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return self.cursor.rowcount
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else:
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return -1
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class FBDialect_kinterbasdb(FBDialect):
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driver = 'kinterbasdb'
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supports_sane_rowcount = False
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supports_sane_multi_rowcount = False
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execution_ctx_cls = FBExecutionContext_kinterbasdb
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supports_native_decimal = True
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colspecs = util.update_copy(
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FBDialect.colspecs,
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{
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sqltypes.Numeric: _FBNumeric_kinterbasdb,
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sqltypes.Float: _FBFloat_kinterbasdb,
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}
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)
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def __init__(self, type_conv=200, concurrency_level=1,
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enable_rowcount=True,
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retaining=False, **kwargs):
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super(FBDialect_kinterbasdb, self).__init__(**kwargs)
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self.enable_rowcount = enable_rowcount
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self.type_conv = type_conv
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self.concurrency_level = concurrency_level
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self.retaining = retaining
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if enable_rowcount:
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self.supports_sane_rowcount = True
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@classmethod
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def dbapi(cls):
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return __import__('kinterbasdb')
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def do_execute(self, cursor, statement, parameters, context=None):
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# kinterbase does not accept a None, but wants an empty list
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# when there are no arguments.
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cursor.execute(statement, parameters or [])
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def do_rollback(self, dbapi_connection):
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dbapi_connection.rollback(self.retaining)
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def do_commit(self, dbapi_connection):
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dbapi_connection.commit(self.retaining)
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def create_connect_args(self, url):
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opts = url.translate_connect_args(username='user')
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if opts.get('port'):
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opts['host'] = "%s/%s" % (opts['host'], opts['port'])
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del opts['port']
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opts.update(url.query)
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util.coerce_kw_type(opts, 'type_conv', int)
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type_conv = opts.pop('type_conv', self.type_conv)
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concurrency_level = opts.pop('concurrency_level',
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self.concurrency_level)
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if self.dbapi is not None:
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initialized = getattr(self.dbapi, 'initialized', None)
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if initialized is None:
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# CVS rev 1.96 changed the name of the attribute:
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# http://kinterbasdb.cvs.sourceforge.net/viewvc/kinterbasdb/
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# Kinterbasdb-3.0/__init__.py?r1=1.95&r2=1.96
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initialized = getattr(self.dbapi, '_initialized', False)
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if not initialized:
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self.dbapi.init(type_conv=type_conv,
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concurrency_level=concurrency_level)
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return ([], opts)
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def _get_server_version_info(self, connection):
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"""Get the version of the Firebird server used by a connection.
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Returns a tuple of (`major`, `minor`, `build`), three integers
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representing the version of the attached server.
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"""
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# This is the simpler approach (the other uses the services api),
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# that for backward compatibility reasons returns a string like
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# LI-V6.3.3.12981 Firebird 2.0
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# where the first version is a fake one resembling the old
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# Interbase signature.
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fbconn = connection.connection
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version = fbconn.server_version
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return self._parse_version_info(version)
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def _parse_version_info(self, version):
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m = match(
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'\w+-V(\d+)\.(\d+)\.(\d+)\.(\d+)( \w+ (\d+)\.(\d+))?', version)
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if not m:
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raise AssertionError(
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"Could not determine version from string '%s'" % version)
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if m.group(5) != None:
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return tuple([int(x) for x in m.group(6, 7, 4)] + ['firebird'])
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else:
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return tuple([int(x) for x in m.group(1, 2, 3)] + ['interbase'])
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def is_disconnect(self, e, connection, cursor):
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if isinstance(e, (self.dbapi.OperationalError,
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self.dbapi.ProgrammingError)):
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msg = str(e)
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return ('Unable to complete network request to host' in msg or
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'Invalid connection state' in msg or
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'Invalid cursor state' in msg or
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'connection shutdown' in msg)
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else:
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return False
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dialect = FBDialect_kinterbasdb
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