如果@@ Trancount> 0不起作用

Question

我正在使用SQL Server 2012,我用回滚事务编写了一个小的存储过程.我的程序如下:

ALTER PROCEDURE [dbo].[uspInsertEmployee] 
@EmpId int,
@EmployeeName varchar(50),
@DeptId int
AS
BEGIN
BEGIN TRY

insert into Departments values (@DeptId, 'Testing 1');
insert into Employees values (@EmpId, @EmployeeName, @DeptId);

END TRY
BEGIN CATCH

--log error here
Goto Error_Rollback
END CATCH

Error_Rollback:

IF @@TRANCOUNT > 0
BEGIN
    print 'rolling back transaction' /* <- this is never printed */
    ROLLBACK TRAN
END
END

正如您所看到的,在If条件中,当@@ TRANCOUNT> 0时,我正在尝试回滚事务,但是当我执行该过程时,从不执行回滚语句,我已经调试了过程和@的值. @TRANCOUNT是1.但我仍然不明白为什么它不起作用.我知道我们不需要使用begin tran和end tran进行回滚.

任何人都可以帮助我解决这个问题.

编辑

对不起,我忘了提到,第二个插入语句中发生错误.

Answer 1

您已经启动了隐式事务.要回滚,你需要开始一个显式的交易(BEGIN TRANSACTION)

ALTER PROCEDURE [dbo].[uspInsertEmployee] 
  @EmpId int,
  @EmployeeName varchar(50),
  @DeptId int
AS

BEGIN

BEGIN TRY
  BEGIN TRAN
  insert into Departments values (@DeptId, 'Testing 1');
  insert into Employees values (@EmpId, @EmployeeName, @DeptId);
  COMMIT TRAN
END TRY

BEGIN CATCH  
  --log error here
 Goto Error_Rollback
END CATCH

Error_Rollback:

  IF @@TRANCOUNT > 0
  BEGIN
    print 'rolling back transaction' /* <- this is never printed */
    ROLLBACK TRAN
  END

END