一个生成订单流水号的存储过程

create procedure sp_order_BuildCode
@ordercode varchar(10) output

as
begin

set @ordercode=''
select @ordercode = max(substring(code,6,4)) from ys_order
where Datediff(day ,addtime,getdate())=0

if(@ordercode is null)
set @ordercode='0000'
declare @xx int
select @xx=cast(@ordercode as int)+1

set @ordercode = '000'+cast(@xx as varchar(7))
set @ordercode = substring(@ordercode,len(@ordercode)-3,4)
set @ordercode = CONVERT(nvarchar(10),GETDATE() , 112),4,5+'_'+@ordercode

end