使用局部变量设置NOCOUNT状态

Question

我试图存储NOCOUNT状态，以便可以在过程结束时将其返回到其原始状态，但它所做的只是给我一个Incorrect syntax near 'NOCOUNT'.错误。

我做错了什么？

IF @@OPTIONS & 512 <> 0     /* check original state of NOCOUNT */
      PRINT N'This user has SET NOCOUNT turned ON.';
  ELSE
      PRINT N'This user has SET NOCOUNT turned OFF.';

DECLARE @NCStat bit
    SET @NCStat = ( @@OPTIONS & 512 )   /* sets @NCStat to original state of NOCOUNT */

SET NOCOUNT ON ;

IF @@OPTIONS & 512 <> 0     /* verify state of NOCOUNT */
      PRINT N'This user has SET NOCOUNT turned ON.';
  ELSE
      PRINT N'This user has SET NOCOUNT turned OFF.';

PRINT N'NCStat = ' + cast(@NCStat as nvarchar) ;        /* verify value of @NCStat */

/* line 23 */  SET NOCOUNT  @NCStat ;       /* return NOCOUNT to original state */

IF @@OPTIONS & 512 <> 0     /* verify state of NOCOUNT */
      PRINT N'This user has SET NOCOUNT turned ON.';
  ELSE
      PRINT N'This user has SET NOCOUNT turned OFF.';
GO

如果删除了第23行，则所有其他行都可以正常工作，但第23行给出了上述错误。

Answer 1

不能使用变量设置NOCOUNT

/* line 23 */  SET NOCOUNT  @NCStat ; /* not legal syntax */

我会这样做：

/* line 23 */
if @NCStat = 1
    SET NOCOUNT ON
else
    SET NOCOUNT OFF