Sql分隔字符串方法--split

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
--DEClARE @str varchar(500)='a,b2,v5,d3,ew,2,3,dd'

--select  [dbo].[split](@str,',',8)

CREATE FUNCTION [dbo].[split]
(@str nvarchar(4000),@code varchar(10),@no int )
RETURNS varchar(200)
AS
BEGIN

declare @intLen int
declare @count int
declare @indexb  int
declare @indexe  int
set @intLen=len(@code)
set @count=0
set @indexb=1

if @no=0
  if charindex(@code,@str,@indexb)<>0
     return left(@str,charindex(@code,@str,@indexb)-1)
  else
     return @str

while charindex(@code,@str,@indexb)<>0
  begin
       set @count=@count+1
       if @count=@no
         break
       set @indexb=@intLen+charindex(@code,@str,@indexb)
  end

if @count=@no
  begin

      set @indexe=@intLen+charindex(@code,@str,@indexb)
          if charindex(@code,@str,@indexe)<>0
             return substring(@str,charindex(@code,@str,@indexb)+len(@code),charindex(@code,@str,@indexe)-charindex(@code,@str,@indexb)-len(@code))
          else
             return right(@str,len(@str)-charindex(@code,@str,@indexb)-len(@code)+1)

  end

return NULL

END

--select dbo.split("列名",',',0)