mysql中截取字符串中的數字

創建一個函數如下：

CREATE DEFINER=`root`@`localhost` FUNCTION `CreateNum`(orderno varchar(50)) RETURNS varchar(30) CHARSET utf8
BEGIN
DECLARE v_length INT DEFAULT 0;
DECLARE v_Tmp varchar(50) default '';
set v_length=CHAR_LENGTH(orderno);
WHILE v_length > 0 DO

IF (ASCII(mid(orderno,v_length,1))>47 and ASCII(mid(orderno,v_length,1))<58 )   THEN
set v_Tmp=concat(v_Tmp,mid(orderno,v_length,1));
END IF;
SET v_length = v_length - 1;
END WHILE;
RETURN REVERSE(v_Tmp);
END

調用方法：

SELECT
    CreateNum(MAX(ORDERNO))
FROM
    SYS_USERORD
WHERE
    ORDERNO LIKE 'HY-191118%'