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pymssql.py
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pymssql.py
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# mssql/pymssql.py
# Copyright (C) 2005-2013 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.sourceforge.net/
Limitations
-----------
pymssql inherits a lot of limitations from FreeTDS, including:
* no support for multibyte schema identifiers
* poor support for large decimals
* poor support for binary fields
* poor support for VARCHAR/CHAR fields over 255 characters
Please consult the pymssql documentation for further information.
"""
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 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)
client_ver = tuple(int(x) for x in module.__version__.split("."))
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 SQL Server.*? - (\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"
):
if msg in str(e):
return True
else:
return False
dialect = MSDialect_pymssql