【MySQL】中文首字母转成拼音

/中文去首字母拼音--传入非中文会输出null/

CREATE FUNCTION fristPinyin(P_NAME VARCHAR(255)) RETURNS varchar(255) CHARSET utf8
BEGIN
DECLARE V_RETURN VARCHAR(255);
DECLARE LEN INT;
DECLARE V_ONE VARCHAR(255);
SET LEN = CHARACTER_LENGTH(P_NAME);
SET V_RETURN = '';
WHILE LEN > 0 DO
SET V_ONE = ELT(INTERVAL(CONV(HEX(left(CONVERT(P_NAME USING gbk),1)),16,10),
0xB0A1,0xB0C5,0xB2C1,0xB4EE,0xB6EA,0xB7A2,0xB8C1,0xB9FE,0xBBF7,
0xBFA6,0xC0AC,0xC2E8,0xC4C3,0xC5B6,0xC5BE,0xC6DA,0xC8BB,
0xC8F6,0xCBFA,0xCDDA,0xCEF4,0xD1B9,0xD4D1),
'A','B','C','D','E','F','G','H','J','K','L','M','N','O','P','Q','R','S','T','W','X','Y','Z');
SET P_NAME = SUBSTRING(P_NAME,2,LEN-1);
SET LEN = LEN -1;
SET V_RETURN = CONCAT(V_RETURN,V_ONE);
END WHILE;
RETURN V_RETURN;
END