sql server 去除字符串里面的中文字符

/*  
*除去字符串中的中文字符  
*/  
CREATE FUNCTION [dbo].[fn_GSB_DropChinese]  
(@value varchar(1000))  
returns varchar(1000)  
AS  
begin  
declare @returnchar varchar(100)  
declare @len int  
select @returnchar='',@len=1  
 while(@len<=LEN(@value))  
 begin  
  if(ASCII(SUBSTRING(@value,@len,1))<122)  
  set @returnchar=@returnchar+SUBSTRING(@value,@len,1)  
  set @len=@len+1  
 end  
 return @returnchar;  
end