SQLSERVER触发器内INSERT,UPDATE,DELETE三种状态

一个触发器内三种INSERT,UPDATE,DELETE状态

CREATE   TRIGGER   tr_T_A   ON     T_A   for   INSERT,UPDATE,DELETE         

  如IF   exists   (select   *   from   inserted)   and   not   exists   (select   *   from   deleted)   则为   INSERT   

  如IF   exists(select   *   from   inserted   )   and   exists   (select   *   from   deleted)   则为   UPDATE   

  如IF   exists   (select   *   from   deleted)   and   not   exists   (select   *   from   inserted)则为   DELETE  

插入操作（Insert）：Inserted表有数据，Deleted表无数据 

删除操作（Delete）：Inserted表无数据，Deleted表有数据 

更新操作（Update）：Inserted表有数据（新数据），Deleted表有数据（旧数据） 

 

笔者用到的案例:

create TRIGGER [risk].[Entry_Head_port_Exchange_Trigger]
   ON  [RiskH800].[risk].[ENTRY_HEAD]
   AFTER INSERT,UPDATE
AS 
DECLARE @COUNT INT
    DECLARE @MANUAL_NO_COUNT INT
    IF EXISTS (SELECT 1 FROM INSERTED)
       IF EXISTS(SELECT 1 FROM DELETED)
       BEGIN
       SELECT @COUNT = COUNT(*) FROM risk.ENTRY_HEAD_port_EXCHANGE WHERE ENTRY_ID = (select ENTRY_ID FROM DELETED)
       SELECT @MANUAL_NO_COUNT = COUNT(MANUAL_NO) FROM DELETED where substring(MANUAL_NO,1,1)= 'B' or substring(MANUAL_NO,1,1)='C'
           IF @COUNT <=0 AND @MANUAL_NO_COUNT>0
           INSERT INTO risk.ENTRY_HEAD_port_EXCHANGE(ENTRY_ID,CREATE_DATE)(SELECT ENTRY_ID,getdate() FROM DELETED)
       END
       ELSE
       BEGIN
       SELECT @COUNT = COUNT(*) FROM risk.ENTRY_HEAD_port_EXCHANGE WHERE ENTRY_ID = (select ENTRY_ID FROM INSERTED)
           SELECT @MANUAL_NO_COUNT = COUNT(MANUAL_NO) FROM INSERTED where substring(MANUAL_NO,1,1)= 'B' or substring(MANUAL_NO,1,1)='C'
           IF @COUNT <=0 AND @MANUAL_NO_COUNT>0
           INSERT INTO risk.ENTRY_HEAD_port_EXCHANGE(ENTRY_ID,CREATE_DATE)(SELECT ENTRY_ID,getdate() FROM INSERTED)
       END