Python pyodbc exec存储过程的参数/输出参数-更新不工作

正在尝试使用python3.6中详述的方法调用存储过程并使用pyodbc执行更新。我有一个方法来处理实例的启动，还有一个方法来完成任务

启动实例非常有效：

def start_instance(self, count):
    params = [1, count]
    sql = """
        DECLARE @out as int;
        EXEC [dbo].[my_sproc] @id = ?, @count = ?, @instance_id = NULL, @output = @out OUTPUT;
        SELECT @out as op;
    """
    val = self.dbObj.query(sql, params).fetchval()
    self.instance = val

def end_instance(self):
    params = [1, self.instance]
    sql = """
        DECLARE @out as int;
        EXEC [dbo].[my_sproc] @id = ?, @instance_id = ?, @output = @out OUTPUT;
        SELECT @out as op;
    """
    val = self.dbObj.query(sql, params).fetchval()
    print(val)

ALTER PROCEDURE [dbo].[my_sproc] @id int, @count int = NULL, @instance_id int = NULL, @output int OUTPUT
AS

IF(@instance_id IS NULL)
    BEGIN
        DECLARE @OutputTbl TABLE (ID INT)
        INSERT INTO [dbo].[my_table]([id], [record_count]) OUTPUT INSERTED.id VALUES(@id, COALESCE(@count, 0));
    END

IF(@instance_id IS NOT NULL)
    BEGIN
        UPDATE [dbo].[my_table] SET [instance_end] = GETDATE(), [records_processed] = COALESCE(@count, 0) WHERE [id] = @id AND [instance_id] = @instance_id;
        SET @output = 1
    END

结束它会产生错误：

def start_instance(self, count):
    params = [1, count]
    sql = """
        DECLARE @out as int;
        EXEC [dbo].[my_sproc] @id = ?, @count = ?, @instance_id = NULL, @output = @out OUTPUT;
        SELECT @out as op;
    """
    val = self.dbObj.query(sql, params).fetchval()
    self.instance = val

def end_instance(self):
    params = [1, self.instance]
    sql = """
        DECLARE @out as int;
        EXEC [dbo].[my_sproc] @id = ?, @instance_id = ?, @output = @out OUTPUT;
        SELECT @out as op;
    """
    val = self.dbObj.query(sql, params).fetchval()
    print(val)

ALTER PROCEDURE [dbo].[my_sproc] @id int, @count int = NULL, @instance_id int = NULL, @output int OUTPUT
AS

IF(@instance_id IS NULL)
    BEGIN
        DECLARE @OutputTbl TABLE (ID INT)
        INSERT INTO [dbo].[my_table]([id], [record_count]) OUTPUT INSERTED.id VALUES(@id, COALESCE(@count, 0));
    END

IF(@instance_id IS NOT NULL)
    BEGIN
        UPDATE [dbo].[my_table] SET [instance_end] = GETDATE(), [records_processed] = COALESCE(@count, 0) WHERE [id] = @id AND [instance_id] = @instance_id;
        SET @output = 1
    END

错误为

pyodbc.ProgrammingError:无结果。以前的SQL不是查询。

我的存储过程：

def start_instance(self, count):
    params = [1, count]
    sql = """
        DECLARE @out as int;
        EXEC [dbo].[my_sproc] @id = ?, @count = ?, @instance_id = NULL, @output = @out OUTPUT;
        SELECT @out as op;
    """
    val = self.dbObj.query(sql, params).fetchval()
    self.instance = val

def end_instance(self):
    params = [1, self.instance]
    sql = """
        DECLARE @out as int;
        EXEC [dbo].[my_sproc] @id = ?, @instance_id = ?, @output = @out OUTPUT;
        SELECT @out as op;
    """
    val = self.dbObj.query(sql, params).fetchval()
    print(val)

ALTER PROCEDURE [dbo].[my_sproc] @id int, @count int = NULL, @instance_id int = NULL, @output int OUTPUT
AS

IF(@instance_id IS NULL)
    BEGIN
        DECLARE @OutputTbl TABLE (ID INT)
        INSERT INTO [dbo].[my_table]([id], [record_count]) OUTPUT INSERTED.id VALUES(@id, COALESCE(@count, 0));
    END

IF(@instance_id IS NOT NULL)
    BEGIN
        UPDATE [dbo].[my_table] SET [instance_end] = GETDATE(), [records_processed] = COALESCE(@count, 0) WHERE [id] = @id AND [instance_id] = @instance_id;
        SET @output = 1
    END

我可以在SSMS中运行以下sql，它可以正常工作：

DECLARE @out as int;
EXEC [dbo].[my_sproc] @id = 1, @count = NULL, @instance_id = 12, @output = @out OUTPUT;
SELECT @out as op

更新：

def start_instance(self, count):
    params = [1, count]
    sql = """
        DECLARE @out as int;
        EXEC [dbo].[my_sproc] @id = ?, @count = ?, @instance_id = NULL, @output = @out OUTPUT;
        SELECT @out as op;
    """
    val = self.dbObj.query(sql, params).fetchval()
    self.instance = val

def end_instance(self):
    params = [1, self.instance]
    sql = """
        DECLARE @out as int;
        EXEC [dbo].[my_sproc] @id = ?, @instance_id = ?, @output = @out OUTPUT;
        SELECT @out as op;
    """
    val = self.dbObj.query(sql, params).fetchval()
    print(val)

ALTER PROCEDURE [dbo].[my_sproc] @id int, @count int = NULL, @instance_id int = NULL, @output int OUTPUT
AS

IF(@instance_id IS NULL)
    BEGIN
        DECLARE @OutputTbl TABLE (ID INT)
        INSERT INTO [dbo].[my_table]([id], [record_count]) OUTPUT INSERTED.id VALUES(@id, COALESCE(@count, 0));
    END

IF(@instance_id IS NOT NULL)
    BEGIN
        UPDATE [dbo].[my_table] SET [instance_end] = GETDATE(), [records_processed] = COALESCE(@count, 0) WHERE [id] = @id AND [instance_id] = @instance_id;
        SET @output = 1
    END

多亏了Gord Thompson关于

设置NOCOUNT ON

的提示，它才开始工作。但是，我最终希望

end\u instance（）

运行atexit。我目前正在这样做：

atexit.register(self.clean_up_on_exit)

然后：

    def clean_up_on_exit(self):
        self.check_in_records()
        self.end_instance()
        self.dbObj.close_conn()

如果我只是为了测试而在

start\u instance（）

的末尾调用

end\u instance（）

，我会得到预期的结果。但是，将它添加到我的

clean\u on\u exit（）

方法不会产生错误，但也不起作用

更新2:

def start_instance(self, count):
    params = [1, count]
    sql = """
        DECLARE @out as int;
        EXEC [dbo].[my_sproc] @id = ?, @count = ?, @instance_id = NULL, @output = @out OUTPUT;
        SELECT @out as op;
    """
    val = self.dbObj.query(sql, params).fetchval()
    self.instance = val

def end_instance(self):
    params = [1, self.instance]
    sql = """
        DECLARE @out as int;
        EXEC [dbo].[my_sproc] @id = ?, @instance_id = ?, @output = @out OUTPUT;
        SELECT @out as op;
    """
    val = self.dbObj.query(sql, params).fetchval()
    print(val)

ALTER PROCEDURE [dbo].[my_sproc] @id int, @count int = NULL, @instance_id int = NULL, @output int OUTPUT
AS

IF(@instance_id IS NULL)
    BEGIN
        DECLARE @OutputTbl TABLE (ID INT)
        INSERT INTO [dbo].[my_table]([id], [record_count]) OUTPUT INSERTED.id VALUES(@id, COALESCE(@count, 0));
    END

IF(@instance_id IS NOT NULL)
    BEGIN
        UPDATE [dbo].[my_table] SET [instance_end] = GETDATE(), [records_processed] = COALESCE(@count, 0) WHERE [id] = @id AND [instance_id] = @instance_id;
        SET @output = 1
    END

单独注册我的函数修复了第二个问题：

    atexit.register(self.check_in_records)
    atexit.register(self.end_instance)

---

可以添加

设置NOCOUNT ON到存储过程的开头？你是我的英雄…它成功了。“它为什么起作用？”GordThompson-刚刚更新了我的问题，并进行了后续跟进。似乎我的atexit函数有问题。可能是