觸發器 (Delete Update)

--delete觸發器
IF(EXISTS(SELECT * FROM sysobjects WHERE name='T_PlanQtyDelete'))
DROP TRIGGER T_PlanQtyDelete
go

   Create trigger T_PlanQtyDelete
       On PlanQty
       for Delete
     As
        INSERT INTO dbo.PlanQtyHistory(qty, addDate, Productid)
        SELECT qty, addDate, Productid FROM deleted
go
 
--update觸發器
IF(EXISTS(SELECT * FROM sysobjects WHERE name='T_PlanQtyUpdate'))
DROP TRIGGER T_PlanQtyUpdate
go

CREATE TRIGGER T_PlanQtyUpdate
    ON PlanQty FOR UPDATE
AS        
    IF UPDATE(qty)
        BEGIN
            INSERT INTO dbo.PlanQtyHistory(qty, addDate, Productid)        
            SELECT qty, addDate, Productid FROM deleted 
            --deleted  表示修改前的值   inserted 表示修改后的值
        END
    

deleted：刪除之前會先把記錄存在這張表里 

inserted:修改之前會先把記錄寫在這種表里

update 會先把記錄寫入deleted 然后再inserted

 

同時 truncate table PlanQty  不會觸發  delet觸發器 換成delete