取汉字拼间首字母函数

说明：我原来也写过一个相同功能的函数，今天看到了下面的代码，发现比我写的简洁多了，效率不错，特的抄录在下面。

 

/*
sql函数: fun_getPY 得到汉字串拼音
*/

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'驁' as word
                             union all select 'B',N'簿'
                             union all select 'C',N'錯'
                     union all select 'D',N'鵽'
                     union all select 'E',N'樲'
                     union all select 'F',N'鰒'
                     union all select 'G',N'腂'
                     union all select 'H',N'夻'
                     union all select 'J',N'攈'
                     union all select 'K',N'穒'
                     union all select 'L',N'鱳'
                     union all select 'M',N'旀'
                     union all select 'N',N'桛'
                     union all select 'O',N'漚'
                     union all select 'P',N'曝'
                     union all select 'Q',N'囕'
                     union all select 'R',N'鶸'
                     union all select 'S',N'蜶'
                     union all select 'T',N'籜'
                     union all select 'W',N'鶩'
                     union all select 'X',N'鑂'
                     union all select 'Y',N'韻'
                     union all select 'Z',N'咗'
                      ) T 
                   where word>=@word collate Chinese_PRC_CS_AS_KS_WS 
                   order by PY ASC
                          ) 
                      else @word 
                 end)
    set @str=right(@str,len(@str)-1)
  end

  return @PY

end