117 lines
3.8 KiB
Python
117 lines
3.8 KiB
Python
# mssql/pymssql.py
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# Copyright (C) 2005-2018 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:: mssql+pymssql
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:name: pymssql
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:dbapi: pymssql
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:connectstring: mssql+pymssql://<username>:<password>@<freetds_name>/?\
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charset=utf8
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:url: http://pymssql.org/
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pymssql is a Python module that provides a Python DBAPI interface around
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`FreeTDS <http://www.freetds.org/>`_. Compatible builds are available for
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Linux, MacOSX and Windows platforms.
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Modern versions of this driver work very well with SQL Server and
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FreeTDS from Linux and is highly recommended.
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"""
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from .base import MSDialect, MSIdentifierPreparer
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from ... import types as sqltypes, util, processors
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import re
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class _MSNumeric_pymssql(sqltypes.Numeric):
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def result_processor(self, dialect, type_):
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if not self.asdecimal:
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return processors.to_float
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else:
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return sqltypes.Numeric.result_processor(self, dialect, type_)
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class MSIdentifierPreparer_pymssql(MSIdentifierPreparer):
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def __init__(self, dialect):
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super(MSIdentifierPreparer_pymssql, self).__init__(dialect)
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# pymssql has the very unusual behavior that it uses pyformat
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# yet does not require that percent signs be doubled
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self._double_percents = False
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class MSDialect_pymssql(MSDialect):
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supports_native_decimal = True
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driver = 'pymssql'
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preparer = MSIdentifierPreparer_pymssql
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colspecs = util.update_copy(
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MSDialect.colspecs,
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{
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sqltypes.Numeric: _MSNumeric_pymssql,
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sqltypes.Float: sqltypes.Float,
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}
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)
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@classmethod
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def dbapi(cls):
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module = __import__('pymssql')
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# pymmsql < 2.1.1 doesn't have a Binary method. we use string
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client_ver = tuple(int(x) for x in module.__version__.split("."))
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if client_ver < (2, 1, 1):
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# TODO: monkeypatching here is less than ideal
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module.Binary = lambda x: x if hasattr(x, 'decode') else str(x)
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if client_ver < (1, ):
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util.warn("The pymssql dialect expects at least "
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"the 1.0 series of the pymssql DBAPI.")
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return module
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def _get_server_version_info(self, connection):
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vers = connection.scalar("select @@version")
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m = re.match(
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r"Microsoft .*? - (\d+).(\d+).(\d+).(\d+)", vers)
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if m:
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return tuple(int(x) for x in m.group(1, 2, 3, 4))
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else:
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return None
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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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opts.update(url.query)
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port = opts.pop('port', None)
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if port and 'host' in opts:
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opts['host'] = "%s:%s" % (opts['host'], port)
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return [[], opts]
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def is_disconnect(self, e, connection, cursor):
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for msg in (
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"Adaptive Server connection timed out",
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"Net-Lib error during Connection reset by peer",
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"message 20003", # connection timeout
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"Error 10054",
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"Not connected to any MS SQL server",
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"Connection is closed",
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"message 20006", # Write to the server failed
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"message 20017", # Unexpected EOF from the server
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):
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if msg in str(e):
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return True
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else:
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return False
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def set_isolation_level(self, connection, level):
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if level == 'AUTOCOMMIT':
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connection.autocommit(True)
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else:
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connection.autocommit(False)
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super(MSDialect_pymssql, self).set_isolation_level(connection,
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level)
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dialect = MSDialect_pymssql
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