morro

sqlalchemy/connectors/pyodbc.py

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+from sqlalchemy.connectors import Connector
+from sqlalchemy.util import asbool
+
+import sys
+import re
+import urllib
+import decimal
+
+class PyODBCConnector(Connector):
+    driver='pyodbc'
+
+    supports_sane_multi_rowcount = False
+    # 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 should
+    # hold the desired driver name
+    pyodbc_driver_name = None
+    
+    # will be set to True after initialize()
+    # if the freetds.so is detected
+    freetds = False
+    
+    @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] = asbool(keys.pop(param))
+
+        if 'odbc_connect' in keys:
+            connectors = [urllib.unquote_plus(keys.pop('odbc_connect'))]
+        else:
+            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 not 'port' in query:
+                    port = ',%d' % int(keys.pop('port'))
+
+                connectors = ["DRIVER={%s}" % keys.pop('driver', self.pyodbc_driver_name),
+                              '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.iteritems()])
+        return [[";".join (connectors)], connect_args]
+        
+    def is_disconnect(self, e):
+        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
+
+        self.freetds = bool(re.match(r".*libtdsodbc.*\.so",  dbapi_con.getinfo(pyodbc.SQL_DRIVER_NAME)))
+
+        # the "Py2K only" part here is theoretical.
+        # have not tried pyodbc + python3.1 yet.
+        # Py2K
+        self.supports_unicode_statements = not self.freetds
+        self.supports_unicode_binds = not self.freetds
+        # end Py2K
+        
+        # run other initialization which asks for user name, etc.
+        super(PyODBCConnector, self).initialize(connection)
+
+    def _get_server_version_info(self, connection):
+        dbapi_con = connection.connection
+        version = []
+        r = re.compile('[.\-]')
+        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)