SQL Server行級觸發器

Question

我試圖通過使用遊標來實現行級刪除觸發器，但是當試圖從表中刪除任何行時，它花了很長時間。

我無法理解它究竟卡在哪裏。

/****** 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

我認爲你應該將光標轉換爲插入選擇語句。我不確定這會解決您的問題，但無論如何，這是一個很好的最佳做法。

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

儘量避免遊標，這將導致更好的性能。