Question

我试图通过使用游标来实现行级删除触发器但是在尝试删除表中的任何行时花了这么长时间。

我无法理解它到底在哪里。

/****** Object:  Trigger [delStudent]    Script Date: 06/24/2010 12:33:33 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

CREATE TRIGGER [delStudent]
   ON  [dbo].[Student]
   FOR DELETE
AS 
DECLARE @Roll as varChar(50); 
DECLARE @Name as varChar(50);
DECLARE @Age as int;
DECLARE @UserName as varChar(50);

SELECT @UserName=SYSTEM_USER;

SET TRANSACTION ISOLATION LEVEL REPEATABLE READ;
BEGIN TRANSACTION;

declare CurD cursor for select roll, Sname, age from deleted    

open CurD

WHILE @@FETCH_STATUS = 0
 BEGIN
    INSERT INTO [dbo].[Audit]
            (roll,sname,age,userId)
    VALUES
            (@Roll,@Name,@Age,@UserName)
 END    
COMMIT TRANSACTION;
Close CurD
DEALLOCATE CurD

Answer 1

我认为你应该在insert-select语句中转换光标。我不确定这会解决你的问题，但无论如何这都是一个很好的最佳实践。

INSERT  [dbo].[Audit] (roll,sname,age,userId)
SELECT 'FIELDS FROM DELETED', SYSTEM_USER 
FROM deleted

尽量避免使用游标，这样可以提高性能。

SQL Server行级触发器

1 个答案: