create table tb(colid int identity,status int,id nvarchar(14))
gocreate trigger test on tb
for insert,update
asbegin
if update(status)
begin
declare @status int,@colid int
select @status = status,@colid = colid from inserted
if @status = 1
begin
declare @nowdate nvarchar(8),@otherdate nvarchar(8),@num nchar(13),@id int
select @nowdate = convert(char(8),getdate(),112),@otherdate = '19990101',@id = 0,@num = ''
select @otherdate = substring(id,1,8),@id = right(id,4) from tb where substring(id,1,8) = @nowdate
if @otherdate <> @nowdate
begin
select @id = 0
end;
select @num = @nowdate + right((10000 + @id + 1),4)
update tb set id = @num where colid = @colid
end;
end;
end;
goinsert into tb(status) select 1
select * from tb
mysql之觸發器trigger
觸發器 trigger 監視某種情況，並觸發某種操作。觸發器建立語法四要素 1.監視地點 table 2.監視事件 insert update delete 3.觸發時間 after before 4.觸發事件 insert update delete 語法 create trigger trigg...
mysql之觸發器trigger
觸發器 trigger 監視某種情況，並觸發某種操作。觸發器建立語法四要素 1.監視地點 table 2.監視事件 insert update delete 3.觸發時間 after before 4.觸發事件 insert update delete 語法 create trigger trigg...
mysql之觸發器trigger
觸發器 trigger 監視某種情況，並觸發某種操作。觸發器建立語法四要素 1.監視地點 table 2.監視事件 insert update delete 3.觸發時間 after before 4.觸發事件 insert update delete 語法 create trigger trigg...