"""Support for the Microsoft SQL Server database via the zxjdbc JDBC
connector.
JDBC Driver
-----------
Requires the jTDS driver, available from: http://jtds.sourceforge.net/
Connecting
----------
URLs are of the standard form of
``mssql+zxjdbc://user:pass@host:port/dbname[?key=value&key=value...]``.
Additional arguments which may be specified either as query string
arguments on the URL, or as keyword arguments to
:func:`~sqlalchemy.create_engine()` will be passed as Connection
properties to the underlying JDBC driver.
"""
from sqlalchemy.connectors.zxJDBC import ZxJDBCConnector
from sqlalchemy.dialects.mssql.base import MSDialect,MSExecutionContext
from sqlalchemy.engine import base
class MSExecutionContext_zxjdbc(MSExecutionContext):
_embedded_scope_identity = False
def pre_exec(self):
super(MSExecutionContext_zxjdbc, self).pre_exec()
# scope_identity after the fact returns null in jTDS so we must
# embed it
if self._select_lastrowid and self.dialect.use_scope_identity:
self._embedded_scope_identity = True
self.statement += "; SELECT scope_identity()"
def post_exec(self):
if self._embedded_scope_identity:
while True:
try:
row = self.cursor.fetchall()[0]
break
except self.dialect.dbapi.Error, e:
self.cursor.nextset()
self._lastrowid = int(row[0])
if (self.isinsert or self.isupdate or self.isdelete) and self.compiled.returning:
self._result_proxy = base.FullyBufferedResultProxy(self)
if self._enable_identity_insert:
table = self.dialect.identifier_preparer.format_table(self.compiled.statement.table)
self.cursor.execute("SET IDENTITY_INSERT %s OFF" % table)
class MSDialect_zxjdbc(ZxJDBCConnector, MSDialect):
jdbc_db_name = 'jtds:sqlserver'
jdbc_driver_name = 'net.sourceforge.jtds.jdbc.Driver'
execution_ctx_cls = MSExecutionContext_zxjdbc
def _get_server_version_info(self, connection):
return tuple(int(x) for x in connection.connection.dbversion.split('.'))
dialect = MSDialect_zxjdbc
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