mysql 函数获取子节点

DELIMITER $$

USE `topsale`$$

DROP FUNCTION IF EXISTS `getShopIdByUserId`$$

CREATE DEFINER=`root`@`%` FUNCTION `getShopIdByUserId`(userId VARCHAR())
RETURNS VARCHAR() CHARSET utf8  ##定义返回值类型  varchar()
BEGIN                    ##函数开始
    DECLARE sTemp VARCHAR();    ##定义一个varchar类型的参数
    DECLARE sTempChd VARCHAR();    ##定义一个varchar类型的参数

    SET sTemp = "";            ##给sTmp赋值
    SET sTempChd =CAST(userId AS CHAR);

    WHILE sTempChd IS NOT NULL DO   ##循环体
        SET sTemp = CONCAT(sTemp,",",sTempChd);  ##拼接sTemp

        SELECT GROUP_CONCAT(shop_id) INTO sTempChd FROM shop_saler_mapping  WHERE FIND_IN_SET(user_login_id,sTempChd)>;
        ##根据父节点，查询出该父节点下的所有子节点的id，支持多级查询
        END WHILE;
        SET sTemp=CONCAT("'",SUBSTR(sTemp,),"'");
        SET sTemp = REPLACE(sTemp,",","','");
        RETURN sTemp;
    END$$

DELIMITER ;

结果：

DELIMITER $$

USE `topsale`$$

DROP FUNCTION IF EXISTS `func_getAllsubclass`$$

CREATE DEFINER=`root`@`%` FUNCTION `func_getAllsubclass`(partyId INT) RETURNS TEXT CHARSET utf8
BEGIN
    DECLARE sTemp TEXT;
        DECLARE sTempChd VARCHAR();

        SET sTemp = "";
        SET sTempChd =CAST(partyId AS CHAR);

        WHILE sTempChd IS NOT NULL DO

        SET sTemp = CONCAT(sTemp,",",sTempChd);

        SELECT GROUP_CONCAT(party_id) INTO sTempChd FROM party WHERE FIND_IN_SET(parent_party_id,sTempChd)>;

        END WHILE;
           SET sTemp=CONCAT("'",SUBSTR(sTemp,),"'");
            SET sTemp = REPLACE(sTemp,",","','");
        RETURN sTemp;
    END$$

DELIMITER ;

结果：