SQL2005 怎么获取汉字的拼音首字母

在sql2005中，怎么获取汉字拼音的首字母？例如，中国人民 ，其拼音首字母组合该为ZGRM。我们可以在在sql2005中定义一个函数fun_getPY，sql语法如下：

/****** 对象:  UserDefinedFunction [dbo].[fun_getPY]    脚本日期: 12/28/2011 10:48:52 ******/
IF  EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[fun_getPY]') AND type in (N'FN', N'IF', N'TF', N'FS', N'FT'))
DROP FUNCTION [dbo].[fun_getPY]

/****** 对象:  UserDefinedFunction [dbo].[fun_getPY]    脚本日期: 12/28/2011 10:49:00 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
create  function [dbo].[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

select dbo.fun_getPY ('56g中国人民rm')

56gZGRMrm