MSSQL汉字转拼音函数实现语句

汉字转拼音(无数据表版) 从获到拼音函数得到的一点心得体会

代码如下:
/* -------------------------------------------------------------
函数: fn_GetPinyin
描述: 汉字转拼音(无数据表版)
使用: dbo.fn_GetPinyin('中华人民共和国') = zhonghuarenmingongheguo
作者: 流香羽 (改编：Tony)
------------------------------------------------------------- */

IF OBJECT_ID('[fn_GetPinyin]') IS NOT NULL
DROP FUNCTION [fn_GetPinyin]
GO
create function [dbo].[fn_GetPinyin](@words nvarchar(2000))
returns varchar(8000)
as
begin
declare @word nchar(1)
declare @pinyin varchar(8000)
declare @i int
declare @words_len int
declare @unicode int
set @i = 1
set @words = ltrim(rtrim(@words))
set @words_len = len(@words)
while (@i <= @words_len) --循环取字符
begin
set @word = substring(@words, @i, 1)
set @unicode = unicode(@word)
set @pinyin = ISNULL(@pinyin +SPACE(1),'')+
(case when unicode(@word) between 19968 and 19968+20901 then
(select top 1 py from (
select 'a' as py,N'厑' as word
union all select 'ai',N'靉'
union all select 'an',N'黯'
union all select 'ang',N'醠'
union all select 'ao',N'驁'
union all select 'ba',N'欛'
union all select 'bai',N'瓸' --韛兡瓸
union all select 'ban',N'瓣'
union all select 'bang',N'鎊'
union all select 'bao',N'鑤'
union all select 'bei',N'鐾'
union all select 'ben',N'輽'
union all select 'beng',N'鏰'
union all select 'bi',N'鼊'
union all select 'bian',N'變'
union all select 'biao',N'鰾'
union all select 'bie',N'彆'
union all select 'bin',N'鬢'
union all select 'bing',N'靐'
union all select 'bo',N'蔔'
union all select 'bu',N'簿'
union all select 'ca',N'囃'
union all select 'cai',N'乲' --縩乲
union all select 'can',N'爘'
union all select 'cang',N'賶'
union all select 'cao',N'鼜'
union all select 'ce',N'簎'
union all select 'cen',N'笒'
union all select 'ceng',N'乽' --硛硳岾猠乽
union all select 'cha',N'詫'
union all select 'chai',N'囆'
union all select 'chan',N'顫'
union all select 'chang',N'韔'
union all select 'chao',N'觘'
union all select 'che',N'爡'
union all select 'chen',N'讖'
union all select 'cheng',N'秤'
union all select 'chi',N'鷘'
union all select 'chong',N'銃'
union all select 'chou',N'殠'
union all select 'chu',N'矗'
union all select 'chuai',N'踹'
union all select 'chuan',N'鶨'
union all select 'chuang',N'愴'
union all select 'chui',N'顀'
union all select 'chun',N'蠢'
union all select 'chuo',N'縒'
union all select 'ci',N'嗭' --賜嗭
union all select 'cong',N'謥'
union all select 'cou',N'輳'
union all select 'cu',N'顣'
union all select 'cuan',N'爨'
union all select 'cui',N'臎'
union all select 'cun',N'籿'
union all select 'cuo',N'錯'
union all select 'da',N'橽'
union all select 'dai',N'靆'
union all select 'dan',N'饏'
union all select 'dang',N'闣'
union all select 'dao',N'纛'
union all select 'de',N'的'
union all select 'den',N'扽'
union all select 'deng',N'鐙'
union all select 'di',N'螮'
union all select 'dia',N'嗲'
union all select 'dian',N'驔'
union all select 'diao',N'鑃'
union all select 'die',N'嚸' --眰嚸
union all select 'ding',N'顁'
union all select 'diu',N'銩'
union all select 'dong',N'霘'
union all select 'dou',N'鬭'
union all select 'du',N'蠹'
union all select 'duan',N'叾' --籪叾
union all select 'dui',N'譵'
union all select 'dun',N'踲'
union all select 'duo',N'鵽'
union all select 'e',N'鱷'
union all select 'en',N'摁'
union all select 'eng',N'鞥'
union all select 'er',N'樲'
union all select 'fa',N'髮'
union all select 'fan',N'瀪'
union all select 'fang',N'放'
union all select 'fei',N'靅'
union all select 'fen',N'鱝'
union all select 'feng',N'覅'
union all select 'fo',N'梻'
union all select 'fou',N'鴀'
union all select 'fu',N'猤' --鰒猤
union all select 'ga',N'魀'
union all select 'gai',N'瓂'
union all select 'gan',N'灨'
union all select 'gang',N'戇'
union all select 'gao',N'鋯'
union all select 'ge',N'獦'
union all select 'gei',N'給'
union all select 'gen',N'搄'
union all select 'geng',N'堩' --亙堩啹喼嗰
union all select 'gong',N'兣' --熕贑兝兣
union all select 'gou',N'購'
union all select 'gu',N'顧'
union all select 'gua',N'詿'
union all select 'guai',N'恠'
union all select 'guan',N'鱹'
union all select 'guang',N'撗'
union all select 'gui',N'鱥'
union all select 'gun',N'謴'
union all select 'guo',N'腂'
union all select 'ha',N'哈'
union all select 'hai',N'饚'
union all select 'han',N'鶾'
union all select 'hang',N'沆'
union all select 'hao',N'兞'
union all select 'he',N'靏'
union all select 'hei',N'嬒'
union all select 'hen',N'恨'
union all select 'heng',N'堼' --堼囍
union all select 'hong',N'鬨'
union all select 'hou',N'鱟'
union all select 'hu',N'鸌'
union all select 'hua',N'蘳'
union all select 'huai',N'蘾'
union all select 'huan',N'鰀'
union all select 'huang',N'鎤'
union all select 'hui',N'顪'
union all select 'hun',N'諢'
union all select 'huo',N'夻'
union all select 'ji',N'驥'
union all select 'jia',N'嗧'
union all select 'jian',N'鑳'
union all select 'jiang',N'謽'
union all select 'jiao',N'釂'
union all select 'jie',N'繲'
union all select 'jin',N'齽'
union all select 'jing',N'竸'
union all select 'jiong',N'蘔'
union all select 'jiu',N'欍'
union all select 'ju',N'爠'
union all select 'juan',N'羂'
union all select 'jue',N'钁'
union all select 'jun',N'攈'
union all select 'ka',N'鉲'
union all select 'kai',N'乫' --鎎乫
union all select 'kan',N'矙'
union all select 'kang',N'閌'
union all select 'kao',N'鯌'
union all select 'ke',N'騍'
union all select 'ken',N'褃'
union all select 'keng',N'鏗' --巪乬唟厼怾
union all select 'kong',N'廤'
union all select 'kou',N'鷇'
union all select 'ku',N'嚳'
union all select 'kua',N'骻'
union all select 'kuai',N'鱠'
union all select 'kuan',N'窾'
union all select 'kuang',N'鑛'
union all select 'kui',N'鑎'
union all select 'kun',N'睏'
union all select 'kuo',N'穒'
union all select 'la',N'鞡'
union all select 'lai',N'籟'
union all select 'lan',N'糷'
union all select 'lang',N'唥'
union all select 'lao',N'軂'
union all select 'le',N'餎'
union all select 'lei',N'脷' --嘞脷
union all select 'leng',N'睖'
union all select 'li',N'瓈'
union all select 'lia',N'倆'
union all select 'lian',N'纞'
union all select 'liang',N'鍄'
union all select 'liao',N'瞭'
union all select 'lie',N'鱲'
union all select 'lin',N'轥' --轥拎
union all select 'ling',N'炩'
union all select 'liu',N'咯' --瓼甅囖咯
union all select 'long',N'贚'
union all select 'lou',N'鏤'
union all select 'lu',N'氇'
union all select 'lv',N'鑢'
union all select 'luan',N'亂'
union all select 'lue',N'擽'
union all select 'lun',N'論'
union all select 'luo',N'鱳'
union all select 'ma',N'嘛'
union all select 'mai',N'霢'
union all select 'man',N'蘰'
union all select 'mang',N'蠎'
union all select 'mao',N'唜'
union all select 'me',N'癦' --癦呅
union all select 'mei',N'嚜'
union all select 'men',N'們'
union all select 'meng',N'霥' --霿踎
union all select 'mi',N'羃'
union all select 'mian',N'麵'
union all select 'miao',N'廟'
union all select 'mie',N'鱴' --鱴瓱
union all select 'min',N'鰵'
union all select 'ming',N'詺'
union all select 'miu',N'謬'
union all select 'mo',N'耱' --耱乮
union all select 'mou',N'麰' --麰蟱