IF EXISTS (SELECT *
FROM sysobjects
WHERE name = N\'NWGetPYFirst\')
DROP FUNCTION NWGetPYFirst
GO

CREATE FUNCTION NWGetPYFirst
(@str varchar(500) = \'\')
RETURNS varchar(500)
AS
BEGIN
Declare @strlen int,
@return varchar(500),
@ii int,
@c char(1),
@chn nchar(1)
--//初始化变量
Declare @pytable table(
chn char(2) COLLATE Chinese_PRC_CS_AS NOT NULL,
py char(1) COLLATE Chinese_PRC_CS_AS NULL,
PRIMARY KEY (chn)
)
insert into @pytable values(\'吖\', \'A\')
insert into @pytable values(\'八\', \'B\')
insert into @pytable values(\'嚓\', \'C\')
insert into @pytable values(\'?鲕', \'D\')
insert into @pytable values(\'??\', \'E\')
insert into @pytable values(\'发\', \'F\')
insert into @pytable values(\'旮\', \'G\')
insert into @pytable values(\'铪\', \'H\')
insert into @pytable values(\'丌\', \'I\')
--insert into @pytable values(\'丌\', \'J\')
insert into @pytable values(\'咔\', \'K\')
insert into @pytable values(\'垃\', \'L\')
insert into @pytable values(\'?`\', \'M\')
insert into @pytable values(\'??\', \'N\')
insert into @pytable values(\'噢\', \'O\')
insert into @pytable values(\'?r\', \'P\')
insert into @pytable values(\'七\', \'Q\')
insert into @pytable values(\'?哕', \'R\')
insert into @pytable values(\'仨\', \'S\')
insert into @pytable values(\'他\', \'T\')
insert into @pytable values(\'?苘', \'U\')
--insert into @pytable values(\'?苘', \'V\')
--insert into @pytable values(\'?苘', \'W\')
insert into @pytable values(\'夕\', \'X\')
insert into @pytable values(\'丫\', \'Y\')
insert into @pytable values(\'??\', \'Z\')

select @strlen = len(@str), @return = \'\', @ii = 0
--//循环整个字符串,用拼音的首字母替换汉字
while @ii < @strlen
begin
select @ii = @ii + 1, @chn = substring(@str, @ii, 1)
if @chn > \'z\' --//检索输入的字符串中有中文字符
SELECT @c = max(py)
FROM @pytable
where chn <= @chn
else
set @c=@chn

set @return=@return+@c
end
return @return
END
GO

-- =============================================
-- Example to execute function
-- =============================================
SELECT dbo.NWGetPYFirst(\'梦想国度\'), dbo.NWGetPYFirst(\'noctwolf分享源码\'), dbo.NWGetPYFirst(\'\')
GO