求教高手指教一个触发器怎么写?
请教高手,我现在要实现这么一个功能:
表1:有字段 name1,name2.就是记录两个人名
表2:也是有字段name1,name2,times,那个times是指次数。
我想在表1里面写个触发器,当给表1插入新数据时候,判断一下,新数据里面的name1,name2在表2的name1,name2是否存在,如果存在,则原有times+1,如果没有,则 times = 1
求教高手,能写源码最好,不能,也请告诉下思路或流程。
[解决办法]
create tr_ins_tab1 on tab1after insertasbegin update tab2 set times = times +1 from tab2 a inner join inserted b on a.name1 = b.name1 and a.name2= b.name2 insert into tab2 select a.name1,a.name2,1 from inserted a where not exists (select 1 from tab2 b a.name1 = b.name1 and a.name2= b.name2)end
[解决办法]
CREATE TRIGGER trg_testON tb1 FOR INSERT AS DECLARE @name1 VARCHAR(10),@name2 varchar(10) SELECT @name1=name1,@name2=name2 FROM INSERTED IF EXISTS(SELECT 1 FROM tb2 WHERE name1=@name1 AND name2=@name2) BEGIN UPDATE tb2 SET times=times+1 WHERE name1=@name1 AND name2=@name2 END ELSE BEGIN INSERT INTO tb2(name1,name2,times) VALUES(@name1,@name2,1) END
[解决办法]
goif object_id('tri_test')is not nulldrop trigger tri_testgocreate trigger tri_test on 表1for insertasif exists(select 1 from inserted i where not exists(select 1 from t2 t where t.name1=i.name and t.name2=i.name2))beginupdate t2 set times=times+1where name1 in(select name1 from inserted)and name2 in(select name2 from inserted)end