sql server自动生成拼音首字母的函数

--生成拼音首码
CREATE function fn_GetPy(@str nvarchar(4000))
returns nvarchar(4000)
--WITH ENCRYPTION
as
begin
declare @intLen int
declare @strRet nvarchar(4000)
declare @temp nvarchar(100)
set @intLen = len(@str)
set @strRet = ''
while @intLen > 0
begin
set @temp = ''
select @temp = case
when substring(@str,@intLen,1) >= '??' then 'Z'
when substring(@str,@intLen,1) >= '丫' then 'Y'
when substring(@str,@intLen,1) >= '夕' then 'X'
when substring(@str,@intLen,1) >= '??' then 'W'
when substring(@str,@intLen,1) >= '他' then 'T'
when substring(@str,@intLen,1) >= '仨' then 'S'
when substring(@str,@intLen,1) >= '??' then 'R'
when substring(@str,@intLen,1) >= '七' then 'Q'
when substring(@str,@intLen,1) >= '?r' then 'P'
when substring(@str,@intLen,1) >= '噢' then 'O'
when substring(@str,@intLen,1) >= '??' then 'N'
when substring(@str,@intLen,1) >= '?`' then 'M'
when substring(@str,@intLen,1) >= '垃' then 'L'
when substring(@str,@intLen,1) >= '咔' then 'K'
when substring(@str,@intLen,1) >= '丌' then 'J'
when substring(@str,@intLen,1) >= '铪' then 'H'
when substring(@str,@intLen,1) >= '旮' then 'G'
when substring(@str,@intLen,1) >= '发' then 'F'
when substring(@str,@intLen,1) >= '??' then 'E'
when substring(@str,@intLen,1) >= '??' then 'D'
when substring(@str,@intLen,1) >= '嚓' then 'C'
when substring(@str,@intLen,1) >= '八' then 'B'
when substring(@str,@intLen,1) >= '吖' then 'A'
else rtrim(ltrim(substring(@str,@intLen,1)))
end
--对于汉字特殊字符，不生成拼音码
if (ascii(@temp)>127) set @temp = ''
--对于英文中小括号，不生成拼音码
if @temp = '(' or @temp = ')' set @temp = ''
select @strRet = @temp + @strRet
set @intLen = @intLen - 1
end
return lower(@strRet)
end