sqlserver拼音助记码

create function   fun_getPY(@str   nvarchar(4000))   
  returns   nvarchar(4000)   
  as   
  begin   
  declare   @word   nchar(1),@PY   nvarchar(4000)   
  set   @PY=''   
  while   len(@str)>0   
  begin   
  set   @word=left(@str,1)   
  --如果非汉字字符，返回原字符   
  set   @PY=@PY+(case   when   unicode(@word)   between   19968   and   19968+20901   
  then   (select   top   1   PY   from   (   
  select   'A'   as   PY,N'骜'   as   word   
  union   all   select   'B',N'簿'   
  union   all   select   'C',N'错'   
  union   all