win32 platform

Lib/site-packages/sqlalchemy/dialects/mssql/pymssql.py

@@ -0,0 +1,96 @@
+# mssql/pymssql.py
+# Copyright (C) 2005-2015 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:: mssql+pymssql
+    :name: pymssql
+    :dbapi: pymssql
+    :connectstring: mssql+pymssql://<username>:<password>@<freetds_name>?\
+charset=utf8
+    :url: http://pymssql.org/
+
+pymssql is a Python module that provides a Python DBAPI interface around
+`FreeTDS <http://www.freetds.org/>`_.  Compatible builds are available for
+Linux, MacOSX and Windows platforms.
+
+"""
+from .base import MSDialect
+from ... import types as sqltypes, util, processors
+import re
+
+
+class _MSNumeric_pymssql(sqltypes.Numeric):
+    def result_processor(self, dialect, type_):
+        if not self.asdecimal:
+            return processors.to_float
+        else:
+            return sqltypes.Numeric.result_processor(self, dialect, type_)
+
+
+class MSDialect_pymssql(MSDialect):
+    supports_sane_rowcount = False
+    driver = 'pymssql'
+
+    colspecs = util.update_copy(
+        MSDialect.colspecs,
+        {
+            sqltypes.Numeric: _MSNumeric_pymssql,
+            sqltypes.Float: sqltypes.Float,
+        }
+    )
+
+    @classmethod
+    def dbapi(cls):
+        module = __import__('pymssql')
+        # 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.")
+        return module
+
+    def __init__(self, **params):
+        super(MSDialect_pymssql, self).__init__(**params)
+        self.use_scope_identity = True
+
+    def _get_server_version_info(self, connection):
+        vers = connection.scalar("select @@version")
+        m = re.match(
+            r"Microsoft .*? - (\d+).(\d+).(\d+).(\d+)", vers)
+        if m:
+            return tuple(int(x) for x in m.group(1, 2, 3, 4))
+        else:
+            return None
+
+    def create_connect_args(self, url):
+        opts = url.translate_connect_args(username='user')
+        opts.update(url.query)
+        port = opts.pop('port', None)
+        if port and 'host' in opts:
+            opts['host'] = "%s:%s" % (opts['host'], port)
+        return [[], opts]
+
+    def is_disconnect(self, e, connection, cursor):
+        for msg in (
+            "Adaptive Server connection timed out",
+            "Net-Lib error during Connection reset by peer",
+            "message 20003",  # connection timeout
+            "Error 10054",
+            "Not connected to any MS SQL server",
+            "Connection is closed",
+            "message 20006",  # Write to the server failed
+        ):
+            if msg in str(e):
+                return True
+        else:
+            return False
+
+dialect = MSDialect_pymssql