sql日期加自增长编号的实现

--获得最后添加InfoNO
declare @last_InfoNO nvarchar(12)   
declare cur_findlast scroll cursor   
for select InfoNO from FeedbackInfos   
open cur_findlast   
fetch last from cur_findlast   
  into @last_InfoNO   
close cur_findlast   
deallocate cur_findlast 
 
--拼接InfoNO  
declare @InfoNO nvarchar(12)
if(convert(nvarchar(8),getdate(),112)=substring(@last_InfoNO,1,8))
begin
	Set @InfoNO = substring(@last_InfoNO,1,8)
				+substring(convert(nvarchar(12),convert(int,'1'+substring(@last_InfoNO,9,4))+1),2,4)
end
else
begin
	Set @InfoNO = convert(nvarchar(8),getdate(),112)+'0001'
end