sql server自动生成拼音首字母的函数

建立一个查询，执行下面的语句生成函数fn_getpy

--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) >= '帀' then 'z'
when substring(@str,@intlen,1) >= '丫' then 'y'
when substring(@str,@intlen,1) >= '夕' then 'x'
when substring(@str,@intlen,1) >= '屲' then 'w'
when substring(@str,@intlen,1) >= '他' then 't'
when substring(@str,@intlen,1) >= '仨' then 's'
when substring(@str,@intlen,1) >= '呥' then 'r'
when substring(@str,@intlen,1) >= '七' then 'q'
when substring(@str,@intlen,1) >= '妑' then 'p'
when substring(@str,@intlen,1) >= '噢' then 'o'
when substring(@str,@intlen,1) >= '拏' then 'n'
when substring(@str,@intlen,1) >= '嘸' 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) >= '妸' then 'e'
when substring(@str,@intlen,1) >= '咑' 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

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测试：
select product_id , dbo.fn_getpy(product_name) as pymc
from dbo.t_product