/usr/lib/python2.7/dist-packages/sqlalchemy/connectors/pyodbc.py is in python-sqlalchemy 1.1.11+ds1-1ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 | # connectors/pyodbc.py
# Copyright (C) 2005-2017 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 Connector
from .. import util
import sys
import re
class PyODBCConnector(Connector):
driver = 'pyodbc'
supports_sane_multi_rowcount = False
if util.py2k:
# PyODBC unicode is broken on UCS-4 builds
supports_unicode = sys.maxunicode == 65535
supports_unicode_statements = supports_unicode
supports_native_decimal = True
default_paramstyle = 'named'
# for non-DSN connections, this *may* be used to
# hold the desired driver name
pyodbc_driver_name = None
# will be set to True after initialize()
# if the freetds.so is detected
freetds = False
# will be set to the string version of
# the FreeTDS driver if freetds is detected
freetds_driver_version = None
# will be set to True after initialize()
# if the libessqlsrv.so is detected
easysoft = False
def __init__(self, supports_unicode_binds=None, **kw):
super(PyODBCConnector, self).__init__(**kw)
self._user_supports_unicode_binds = supports_unicode_binds
@classmethod
def dbapi(cls):
return __import__('pyodbc')
def create_connect_args(self, url):
opts = url.translate_connect_args(username='user')
opts.update(url.query)
keys = opts
query = url.query
connect_args = {}
for param in ('ansi', 'unicode_results', 'autocommit'):
if param in keys:
connect_args[param] = util.asbool(keys.pop(param))
if 'odbc_connect' in keys:
connectors = [util.unquote_plus(keys.pop('odbc_connect'))]
else:
def check_quote(token):
if ";" in str(token):
token = "'%s'" % token
return token
keys = dict(
(k, check_quote(v)) for k, v in keys.items()
)
dsn_connection = 'dsn' in keys or \
('host' in keys and 'database' not in keys)
if dsn_connection:
connectors = ['dsn=%s' % (keys.pop('host', '') or
keys.pop('dsn', ''))]
else:
port = ''
if 'port' in keys and 'port' not in query:
port = ',%d' % int(keys.pop('port'))
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:
connectors.append("UID=%s" % user)
connectors.append("PWD=%s" % keys.pop('password', ''))
else:
connectors.append("Trusted_Connection=Yes")
# if set to 'Yes', the ODBC layer will try to automagically
# convert textual data from your database encoding to your
# client encoding. This should obviously be set to 'No' if
# you query a cp1253 encoded database from a latin1 client...
if 'odbc_autotranslate' in keys:
connectors.append("AutoTranslate=%s" %
keys.pop("odbc_autotranslate"))
connectors.extend(['%s=%s' % (k, v) for k, v in keys.items()])
return [[";".join(connectors)], connect_args]
def is_disconnect(self, e, connection, cursor):
if isinstance(e, self.dbapi.ProgrammingError):
return "The cursor's connection has been closed." in str(e) or \
'Attempt to use a closed connection.' in str(e)
elif isinstance(e, self.dbapi.Error):
return '[08S01]' in str(e)
else:
return False
def initialize(self, connection):
# determine FreeTDS first. can't issue SQL easily
# without getting unicode_statements/binds set up.
pyodbc = self.dbapi
dbapi_con = connection.connection
_sql_driver_name = dbapi_con.getinfo(pyodbc.SQL_DRIVER_NAME)
self.freetds = bool(re.match(r".*libtdsodbc.*\.so", _sql_driver_name
))
self.easysoft = bool(re.match(r".*libessqlsrv.*\.so", _sql_driver_name
))
if self.freetds:
self.freetds_driver_version = dbapi_con.getinfo(
pyodbc.SQL_DRIVER_VER)
self.supports_unicode_statements = (
not util.py2k or
(not self.freetds and not self.easysoft)
)
if self._user_supports_unicode_binds is not None:
self.supports_unicode_binds = self._user_supports_unicode_binds
elif util.py2k:
self.supports_unicode_binds = (
not self.freetds or self.freetds_driver_version >= '0.91'
) and not self.easysoft
else:
self.supports_unicode_binds = True
# run other initialization which asks for user name, etc.
super(PyODBCConnector, self).initialize(connection)
def _dbapi_version(self):
if not self.dbapi:
return ()
return self._parse_dbapi_version(self.dbapi.version)
def _parse_dbapi_version(self, vers):
m = re.match(
r'(?:py.*-)?([\d\.]+)(?:-(\w+))?',
vers
)
if not m:
return ()
vers = tuple([int(x) for x in m.group(1).split(".")])
if m.group(2):
vers += (m.group(2),)
return vers
def _get_server_version_info(self, connection):
# NOTE: this function is not reliable, particularly when
# freetds is in use. Implement database-specific server version
# queries.
dbapi_con = connection.connection
version = []
r = re.compile(r'[.\-]')
for n in r.split(dbapi_con.getinfo(self.dbapi.SQL_DBMS_VER)):
try:
version.append(int(n))
except ValueError:
version.append(n)
return tuple(version)
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