SqlServer 获取汉字的拼音首字母

CREATE FUNCTION GetInitialLetter(@ChineseString NVARCHAR(4000)) 
RETURNS NVARCHAR(4000) 
AS
BEGIN
 
DECLARE @SingleCharacter NCHAR(1),
@ReturnString NVARCHAR(4000) 
SET @ReturnString = ‘‘ 

WHILE LEN(@ChineseString)>0 
BEGIN

--依次取单个字符
SET @SingleCharacter = LEFT(@ChineseString,1) 

----汉字字符，返回字符对应首字母,非汉字字符,返回原字符
IF(UNICODE(@SingleCharacter) BETWEEN 19968 AND 19968+20901)
SET @ReturnString = @ReturnString + 
(SELECT TOP 1 PY FROM
(SELECT ‘A‘ AS PY,N‘骜‘ AS ChineseCharacters 
UNION All SELECT ‘B‘,N‘簿‘ 
UNION All SELECT ‘C‘,N‘错‘ 
UNION All SELECT ‘D‘,N‘鵽‘ 
UNION All SELECT ‘E‘,N‘樲‘ 
UNION All SELECT ‘F‘,N‘鳆‘ 
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‘沤‘ 
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‘箨‘ 
UNION All SELECT ‘W‘,N‘鹜‘ 
UNION All SELECT ‘X‘,N‘鑂‘ 
UNION All SELECT ‘Y‘,N‘韵‘ 
UNION All SELECT ‘Z‘,N‘咗‘ 
)SpellingTable 
where ChineseCharacters > = @SingleCharacter COLLATE Chinese_PRC_CS_AS_KS_WS 
ORDER by PY ASC)
ELSE
SET @ReturnString = @ReturnString + @SingleCharacter
 
SET @ChineseString = RIGHT(@ChineseString,LEN(@ChineseString)-1) 

END
 
RETURN @ReturnString 

END
GO