SQLserver 存储过程生成任意进制/顺序流水号

ALTER    PROCEDURE [dbo].[TentoSerial]
@num int,
@ret nvarchar(10) output
AS

declare @StringXL nvarchar(50)
declare @CharXL nvarchar(10)
declare @modnum int

set @StringXL='0123456789ABCDEFGHJKLMNPRSTUVWXYZ'
set @CharXL=''

if @num>35936
    begin
        raiserror('流水号已超过上限35936',16,-1)
        return -1
    end
if (@num<=32)
begin
    set @CharXL=SUBSTRING(@stringxl,@num+1,1)
end
while @num>32
    begin
        set @modnum=@num%33
        set @num=@num/33
        set @CharXL=SUBSTRING(@stringxl,@modnum+1,1)+@CharXL
        if (@num<=32)
            begin
                set @CharXL=SUBSTRING(@stringxl,@num+1,1)+@CharXL
            end
    end
select @ret=right('000'+@CharXL,3)
return 0