MySQL获取汉字拼音首字母

MySQL获取汉字拼音首字母

-输入：中文字符串
-输出：拼音首字母

CREATE DEFINER=`root`@`localhost` FUNCTION `util_GetPY`(`in_string` varchar(100)) RETURNS varchar(100) CHARSET utf8mb4 COLLATE utf8mb4_unicode_ci
    COMMENT '根据内码区段获取汉字的拼音首字母'
BEGIN	
	DECLARE tmp_str VARCHAR(100) CHARSET gbk DEFAULT '' ;
	DECLARE tmp_char VARCHAR(100) CHARSET gbk DEFAULT '' ; 
	DECLARE V_LEN INT;
	DECLARE V_I INT;
	DECLARE V_PY VARCHAR(100);
	SET V_LEN=CHAR_LENGTH(in_string);
	SET V_I=1;
	SET V_PY='';
	
	DROP TEMPORARY TABLE IF EXISTS TT_PYZD;
	CREATE TEMPORARY TABLE TT_PYZD (chr char(2) ,letter char(2)) DEFAULT CHARSET gbk;
	INSERT INTO TT_PYZD
		SELECT '吖 ', 'A ' UNION ALL SELECT '八 ', 'B ' UNION ALL 
		SELECT '嚓 ', 'C ' UNION ALL SELECT '咑 ', 'D ' UNION ALL 
		SELECT '妸 ', 'E ' UNION ALL SELECT '发 ', 'F ' UNION ALL 
		SELECT '旮 ', 'G ' UNION ALL SELECT '铪 ', 'H ' UNION ALL 
		SELECT '丌 ', 'J ' UNION ALL SELECT '咔 ', 'K ' UNION ALL 
		SELECT '垃 ', 'L ' UNION ALL SELECT '嘸 ', 'M ' UNION ALL 
		SELECT '拏 ', 'N ' UNION ALL SELECT '噢 ', 'O ' UNION ALL 
		SELECT '妑 ', 'P ' UNION ALL SELECT '七 ', 'Q ' UNION ALL 
		SELECT '呥 ', 'R ' UNION ALL SELECT '仨 ', 'S ' UNION ALL 
		SELECT '他 ', 'T ' UNION ALL SELECT '屲 ', 'W ' UNION ALL 
		SELECT '夕 ', 'X ' UNION ALL SELECT '丫 ', 'Y ' UNION ALL 
		SELECT '帀 ', 'Z ' ;
	WHILE V_I<=V_LEN DO 
		SET tmp_str = substring(in_string,V_I,1);
		IF ASCII(tmp_str)<127 THEN
			SET tmp_char=UPPER(tmp_str);
		ELSE
			SELECT letter INTO tmp_char FROM TT_PYZD WHERE chr<=tmp_str ORDER BY chr DESC LIMIT 1;
		END IF ;
		SET V_I=V_I+1;
		SET V_PY=CONCAT(V_PY,tmp_char);
	END WHILE;
	DROP TEMPORARY TABLE IF EXISTS TT_PYZD;
	RETURN V_PY;
	
END