114 lines
4.0 KiB
Python
114 lines
4.0 KiB
Python
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from sqlalchemy.connectors import Connector
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from sqlalchemy.util import asbool
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import sys
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import re
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import urllib
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import decimal
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class PyODBCConnector(Connector):
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driver='pyodbc'
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supports_sane_multi_rowcount = False
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# PyODBC unicode is broken on UCS-4 builds
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supports_unicode = sys.maxunicode == 65535
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supports_unicode_statements = supports_unicode
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supports_native_decimal = True
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default_paramstyle = 'named'
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# for non-DSN connections, this should
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# hold the desired driver name
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pyodbc_driver_name = None
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# will be set to True after initialize()
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# if the freetds.so is detected
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freetds = False
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@classmethod
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def dbapi(cls):
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return __import__('pyodbc')
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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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keys = opts
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query = url.query
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connect_args = {}
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for param in ('ansi', 'unicode_results', 'autocommit'):
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if param in keys:
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connect_args[param] = asbool(keys.pop(param))
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if 'odbc_connect' in keys:
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connectors = [urllib.unquote_plus(keys.pop('odbc_connect'))]
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else:
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dsn_connection = 'dsn' in keys or ('host' in keys and 'database' not in keys)
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if dsn_connection:
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connectors= ['dsn=%s' % (keys.pop('host', '') or keys.pop('dsn', ''))]
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else:
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port = ''
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if 'port' in keys and not 'port' in query:
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port = ',%d' % int(keys.pop('port'))
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connectors = ["DRIVER={%s}" % keys.pop('driver', self.pyodbc_driver_name),
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'Server=%s%s' % (keys.pop('host', ''), port),
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'Database=%s' % keys.pop('database', '') ]
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user = keys.pop("user", None)
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if user:
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connectors.append("UID=%s" % user)
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connectors.append("PWD=%s" % keys.pop('password', ''))
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else:
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connectors.append("Trusted_Connection=Yes")
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# if set to 'Yes', the ODBC layer will try to automagically convert
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# textual data from your database encoding to your client encoding
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# This should obviously be set to 'No' if you query a cp1253 encoded
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# database from a latin1 client...
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if 'odbc_autotranslate' in keys:
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connectors.append("AutoTranslate=%s" % keys.pop("odbc_autotranslate"))
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connectors.extend(['%s=%s' % (k,v) for k,v in keys.iteritems()])
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return [[";".join (connectors)], connect_args]
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def is_disconnect(self, e):
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if isinstance(e, self.dbapi.ProgrammingError):
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return "The cursor's connection has been closed." in str(e) or \
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'Attempt to use a closed connection.' in str(e)
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elif isinstance(e, self.dbapi.Error):
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return '[08S01]' in str(e)
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else:
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return False
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def initialize(self, connection):
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# determine FreeTDS first. can't issue SQL easily
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# without getting unicode_statements/binds set up.
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pyodbc = self.dbapi
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dbapi_con = connection.connection
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self.freetds = bool(re.match(r".*libtdsodbc.*\.so", dbapi_con.getinfo(pyodbc.SQL_DRIVER_NAME)))
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# the "Py2K only" part here is theoretical.
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# have not tried pyodbc + python3.1 yet.
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# Py2K
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self.supports_unicode_statements = not self.freetds
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self.supports_unicode_binds = not self.freetds
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# end Py2K
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# run other initialization which asks for user name, etc.
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super(PyODBCConnector, self).initialize(connection)
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def _get_server_version_info(self, connection):
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dbapi_con = connection.connection
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version = []
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r = re.compile('[.\-]')
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for n in r.split(dbapi_con.getinfo(self.dbapi.SQL_DBMS_VER)):
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try:
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version.append(int(n))
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except ValueError:
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version.append(n)
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return tuple(version)
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