创建生成流水号的触发器

create table test(id varchar(18),  --流水号,日期(8位)+时间(4位)+流水号(4位)
name varchar(10)  --其他字段
)

go
--创建生成流水号的触发器
create trigger t_insert
on test
INSTEAD OF insert
as
declare @id varchar(18),@id1 int,@head varchar(12)
select * into #tb from inserted
set @head=convert(varchar,getdate(),112)+replace(convert(varchar(5),getdate(),108),':','')
select @id=max(id) from test where id like @head+'%'
if @id is null
set @id1=0
else
set @id1=cast(substring(@id,13,4) as int)
update #tb set @id1=@id1+1
,id=@head+right('0000'+cast(@id1 as varchar),4)
insert into test select * from #tb
go

--插入数据,进行测试
insert into test(name)
select 'aa'
union all select 'bb'
union all select 'cc'

--修改系统时间,再插入数据测试一次
insert into test(name)
select 'aa'
union all select 'bb'
union all select 'cc'

--显示测试结果
select * from test

--删除测试环境
drop table test
                                                                            author : miss wang  reshipment