Question

我想创建一个删除前触发器。当我从表中删除记录时，该记录必须插入到历史表中。我该如何在SQL Server中执行此操作？

Answer 1

在这种情况下，你可能最好做一个常规的“后”触发器。这是解决此类情况的最常见方法。

像

这样的东西

CREATE TRIGGER TRG_AUD_DEL
ON yourTable
FOR DELETE
AS
     INSERT INTO my_audit_table  (col1, col2, ...)
     SELECT col1, col2...
     FROM DELETED

当从表中删除记录（或记录！）时，将删除的行将插入my_audit_table DELETED表是包含记录的虚拟表（ s）因为它们是在删除之前。

另请注意，触发器在delete语句中作为隐式事务的一部分运行，因此如果删除失败并回滚，则触发器也将回滚。

Answer 2

您也可以使用INSTEAD OF DELETE

CREATE TRIGGER dbo.SomeTableYouWhatToDeleteFrom
ON dbo.YourTable
INSTEAD OF DELETE
AS
BEGIN

     -- Some code you want to do before delete

     DELETE YourTable
     FROM DELETED D
     INNER JOIN dbo.YourTable T ON T.PK_1 = D.PK_1
END

Answer 3

可以按照以下步骤完成，我想在这个例子中我使用的是客户表：

CREATE TABLE CUSTOMERS(
   ID   INT              NOT NULL,
   NAME VARCHAR (20)     NOT NULL,
   AGE  INT              NOT NULL,
   ADDRESS  CHAR (25) ,
   LAST_UPDATED DATETIME,
   PRIMARY KEY (ID)
);

创建历史记录：

CREATE TABLE CUSTOMERS_HIST( 
ID   INT              NOT NULL,
NAME VARCHAR (20)     NOT NULL,
AGE  INT              NOT NULL,
ADDRESS  CHAR (25) ,
LAST_UPDATED DATETIME,
PRIMARY KEY (ID)
);

在删除事件上触发源表（如下所示）：

CREATE TRIGGER TRG_CUSTOMERS_DEL 
ON CUSTOMERS
FOR DELETE
AS
     INSERT INTO CUSTOMERS_HIST (ID, NAME, AGE, ADDRESS, LAST_UPDATED)
     SELECT ID, NAME, AGE, ADDRESS, LAST_UPDATED
     FROM DELETED

如何在SQL Server中创建一个删除前触发器？

3 个答案: