插入在事务中失败,但是sql server返回1行受影响？

Question

这是我的执行流程stored procedure:

ALTER procedure dbo.usp_DoSomething

as

declare @Var1 int
declare @Var2 int
declare @Var3 int

select 
@Var1 = Var1,
@Var2 = Var2,
@Var3 = Var3
from Table
where  
...

BEGIN TRY
    BEGIN TRANSACTION
        /* UPDATE Table. This executes successfully */

        /* INSERT Table. This fails due to PK violation */

        COMMIT TRAN /* This does not happen */
END TRY
BEGIN CATCH
    IF @@TRANCOUNT > 0
        ROLLBACK TRAN /* This occurs because TRANS failed */
END CATCH

在UPDATE成功运行.的INSERT失败,所以transaction被回滚.

执行后,表格看起来正确,没有任何变化.但是当我运行SP时,我收到以下消息:

(1 row(s) affected)

(0 row(s) affected)

所以我问自己,第1 row(s) affected一个来自哪里？

然后我想这就是原因,但是想确认一下:OUTPUT子句(Transact-SQL)

An UPDATE, INSERT, or DELETE statement that has an OUTPUT clause will return
rows to the client even if the statement encounters errors and is rolled back.
The result should not be used if any error occurs when you run the statement.

Answer 1

SET NOCOUNT ON默认情况下，除非启用，否则将为每个 DML 语句返回行计数。无论事务是否成功，或者回滚或提交，您的 UPDATE 语句都是成功的，因此会收到通知(1 row(s) affected)。

你提到的条款OUTPUT与此无关，因为你没有指定它。