sql server 使用 pyodbc 返回值 [英] sql server return value with pyodbc

问题描述

我正在尝试使用 pyodbc 运行一些存储过程并使用以下代码获取单个返回值:

I am trying to run some stored proc with pyodbc and get the single return value using following code:

conn = pyodbc.connect("driver={SQL Server};server=MyServer;database=MyDB;trusted_connection=true") 

cursor = conn.cursor()

SQL_command = """
                DECLARE @ret INT

                EXEC @ret = [dbo].proc_mySP             
                  @group= 0
                , @description =?

                SELECT @ret
              """

cursor.execute(SQL_command, description)
retValue = cursor.fetchall()

存储过程的框架如下:

-- SOME CODE
-- ......
-- EXEC another_sp
-- DECLARE @RET INT
-- SELECT @RET as retValue
-- ......

上面的sql在sql server中运行正常，但是当上面的Python代码调用它时，它给出了错误信息:

The above sql works fine in sql server, however, when it was called by the above Python code, it gives error messages:

pyodbc.ProgrammingError: ('24000', '[24000] [Microsoft][ODBC SQL服务器驱动程序]无效的游标状态 (0) (SQLNumResultCols)')

pyodbc.ProgrammingError: ('24000', '[24000] [Microsoft][ODBC SQL Server Driver]Invalid cursor state (0) (SQLNumResultCols)')

我可以知道我的代码有什么问题吗?

May I know what is wrong with my code?

非常感谢.

推荐答案

尝试通过 pyodbc 运行多语句 T-SQL 脚本可能会出现问题.即使这在 SSMS 中运行良好

Trying to run multi-statement T-SQL scripts via pyodbc can be problematic. Even though this works fine in SSMS

DECLARE @tbl AS TABLE (retVal INT);
INSERT INTO @tbl (retVal) 
        EXEC [dbo].proc_mySP
                @group = 37,
                @description = 'foo';
SELECT retVal FROM @tbl;

以下 Python 代码...

the following Python code ...

sql = """\
DECLARE @tbl AS TABLE (retVal INT);
INSERT INTO @tbl (retVal) 
        EXEC [dbo].proc_mySP
                @group = 37,
                @description = ?;
SELECT retVal FROM @tbl;
"""
crsr.execute(sql, ['foo'])
row = crsr.fetchone()

...失败

pyodbc.ProgrammingError:没有结果.以前的 SQL 不是查询.

pyodbc.ProgrammingError: No results. Previous SQL was not a query.

如果存储过程返回一个单列的单行结果集，那么你需要做的就是

If the stored procedure returns a single-row result set with a single column then all you need to do is

import pyodbc
cnxn = pyodbc.connect("DSN=myDb_SQLEXPRESS")
crsr = cnxn.cursor()
sql = """\
EXEC [dbo].proc_mySP
        @group = 37,
        @description = ?;
"""
crsr.execute(sql, ['foo'])
the_result = crsr.fetchone()[0]
print(the_result)

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