Question

我是创建触发器的新手。当我更新我的一个表时，请帮助创建更新触发器，它也会更新其他两个表。我有三个名为tblDHColl，tblDHSurv和tblDHLithology的表。所有表格都有一些共同的字段，例如“数据集”，“＃3; HoleID”和“＃39;和＆＃39;验证＆＃39;。我想要的是，当我更新＆＃39;验证＆＃39;在具有值＆＃34; 1＆＃34;的tblDHColl表中的字段，它应该更新＆＃39;验证＆＃39;其他两个表中具有相同值的字段。我有两个值1（True）和0（False）来更新此列。请帮我创建一个触发器来更新其他两个表。

Answer 1

我在tblDHColl上创建了一个触发器。因此，如果您将tblDHColl.Validated从1更新为0或0更新为1，则触发器将更新其他2个表。

 create table tblDHColl ( HoleID int ,  Dataset int ,  Validated int)
 create table tblDHSurv ( HoleID int ,  Dataset int ,  Validated int)
 create table tblDHLithology ( HoleID int ,  Dataset int ,  Validated int)

 insert into tblDHColl 
 select 1,100, 1
 union all select 2,500, 0
 union all select 3,700, 1
 union all select 4,300, 0
 union all select 5,900, 1

  insert into tblDHSurv 
 select 1,100, 1
 union all select 2,500, 0
 union all select 3,700, 1
 union all select 4,300, 0
 union all select 5,900, 1


  insert into tblDHLithology 
 select 1,100, 1
 union all select 2,500, 0
 union all select 3,700, 1
 union all select 4,300, 0
 union all select 5,900, 1
 go


create trigger tr1 on tblDHColl
for update
as 
begin
    declare @Validated_new int , @Validated_old int , @HoleID int
    select @HoleID = i.HoleID ,@Validated_new=i.Validated from inserted i
    select @Validated_old=d.Validated from deleted d

    if (@Validated_new <>@Validated_old )
    begin 
        update tblDHSurv
        set Validated =  @Validated_new 
        where HoleID = @HoleID

        update tblDHLithology
        set Validated =   @Validated_new  
        where HoleID = @HoleID
    end 

end
go


update tblDHColl
set Validated = 1
where HoleID = 2

select * from  tblDHColl  where HoleID = 2
select * from tblDHSurv  where HoleID = 2
select * from  tblDHLithology  where HoleID = 2

创建触发器以更新不同的表

1 个答案: