sql-server - 是否只需要在开始事务时调用 SET XACT_ABORT ？

Question

我想澄清一下这个答案 -> Nested stored procedures containing TRY CATCH ROLLBACK pattern?

以下是来自上述链接的代码示例

 1 CREATE PROCEDURE [Name]
 2 AS
 3 SET XACT_ABORT, NOCOUNT ON
 4
 5 DECLARE @starttrancount int
 6
 7 BEGIN TRY
 8    SELECT @starttrancount = @@TRANCOUNT
 9
10    IF @starttrancount = 0
11        BEGIN TRANSACTION
12
13       [...Perform work, call nested procedures...]
14
15    IF @starttrancount = 0 
16        COMMIT TRANSACTION
17 END TRY
19 BEGIN CATCH
20    IF XACT_STATE() <> 0 AND @starttrancount = 0 
21        ROLLBACK TRANSACTION
22    RAISERROR [rethrow caught error using @ErrorNumber, @ErrorMessage, etc]
23 END CATCH
24 GO

假设它是从启动事务的遗留存储过程调用的。
在这种情况下，这个 proc 不会启动它自己的事务，但会改变调用的 XACT_ABORT 状态。

所以，我在这里有几个问题。

XACT_ABORT 是否对当前有效
仅 proc 或整个通话
堆？

如果我想重构一个 proc 来使用
SET XACT_ABORT ON，我需要配对吗
它与 SET XACT_ABORT OFF 一起吗？这是对遗留代码最安全的方法吗？

下面是修改后的示例，它有条件地打开 XACT_ABORT 并将其与在 proc 退出时关闭它配对

CREATE PROCEDURE [Name]
AS
SET NOCOUNT ON

DECLARE @starttrancount int

BEGIN TRY
   SELECT @starttrancount = @@TRANCOUNT

   IF @starttrancount = 0
   BEGIN
      SET XACT_ABORT ON
      BEGIN TRANSACTION
   END

      [...Perform work, call nested procedures...]

   IF @starttrancount = 0 
   BEGIN
      COMMIT TRANSACTION
      SET XACT_ABORT OFF
   END
END TRY
BEGIN CATCH
   IF XACT_STATE() <> 0 AND @starttrancount = 0 
   BEGIN
       ROLLBACK TRANSACTION
       SET XACT_ABORT OFF
   END
   RAISERROR [rethrow caught error using @ErrorNumber, @ErrorMessage, etc]
END CATCH
GO

Answer 1

据我所知，当子批次的执行结束时，它会恢复此设置的先前值。

SET NOCOUNT ON;

BEGIN TRAN

SELECT CASE
         WHEN 16384 & @@OPTIONS = 16384
           THEN 'XACT_ABORT IS ON'
         ELSE ' XACT_ABORT IS OFF'
       END

CREATE TABLE #T
  (
     C INT
  )

SET XACT_ABORT OFF

INSERT INTO #T
VALUES      (1)

EXEC ('SET XACT_ABORT ON; 
      INSERT INTO #T VALUES(2);
        SELECT CASE
                    WHEN 16384 & @@OPTIONS = 16384
                    THEN ''XACT_ABORT IS ON''
                    ELSE '' XACT_ABORT IS OFF''
                END 
      ')


INSERT INTO #T
VALUES      (1 / 0)

/*If XACT_ABORT was on we would never get here but we do!*/
COMMIT

SELECT *
FROM   #T

DROP TABLE #T

SELECT CASE
         WHEN 16384 & @@OPTIONS = 16384
           THEN 'XACT_ABORT IS ON'
         ELSE ' XACT_ABORT IS OFF'
       END 

退货

------------------
 XACT_ABORT IS OFF


------------------
XACT_ABORT IS ON

Msg 8134, Level 16, State 1, Line 31
Divide by zero error encountered.
The statement has been terminated.
C
-----------
1
2


------------------
 XACT_ABORT IS OFF