我需要帮助调用＆＃34; sp_executesql＆＃34;通过callproc（我需要它作为RPC）。这是我的代码：
import pymssql
conn = pymssql.connect(host='11.22.33.44:1433', user='sa', password='XYZ', database='AdventureWorks')
cur = conn.cursor()
cur.callproc("sp_executesql", 'SELECT * FROM AdventureWorks.HumanResources.Employee WHERE BusinessEntityID = 109')
我收到此错误：
File "executesql.py", line 4, in <module>
cur.callproc("sp_executesql", 'SELECT * FROM AdventureWorks.HumanResources.Employee WHERE BusinessEntityID = 109')
File "pymssql.pyx", line 357, in pymssql.Cursor.callproc (pymssql.c:4238)
self._returnvalue = proc.execute()
File "_mssql.pyx", line 1289, in _mssql.MSSQLStoredProcedure.execute (_mssql.c:12177)
check_cancel_and_raise(rtc, self.conn)
File "_mssql.pyx", line 1322, in _mssql.check_cancel_and_raise (_mssql.c:12473)
return maybe_raise_MSSQLDatabaseException(conn)
File "_mssql.pyx", line 1366, in _mssql.maybe_raise_MSSQLDatabaseException (_mssql.c:13067)
raise ex
_mssql.MSSQLDatabaseException: (214, "Procedure expects parameter '@statement' of type 'ntext/nchar/nvarchar'.DB-Lib error message 214, severity 16:\nGeneral SQL Server error: Check messages from the SQL Server\n")
运行其他存储过程顺利进行。 将字符串作为unicode运行（u＆＃39;选择...＆＃39;）会出现此错误：
Traceback (most recent call last):
File "executesql.py", line 4, in <module>
cur.callproc("sp_executesql", u'SELECT * FROM AdventureWorks.HumanResources.Employee WHERE BusinessEntityID = 109')
File "pymssql.pyx", line 354, in pymssql.Cursor.callproc (pymssql.c:4177)
raise NotSupportedError('Unable to determine database type')
pymssql.NotSupportedError: Unable to determine database type
你知道怎么克服这个吗？
SQL Server是 Microsoft SQL Server 2012 - 11.0.2100.60（X64）2012年2月10日19:39:15版权所有（c）Windows NT 6.1（Build 7601：Service Pack 1）上的Microsoft Corporation Enterprise Edition（64位）（Hypervisor）
非常感谢