MYSQL存储过程：递归查询父节点，并更新数据

业务描述：机构向下管理，需要获取每个机构的所有上级节点，并得到对应的级别效果，如图：执行前：


执行后：


存储过程：BEGIN      DECLARE fid varchar(100) default '';       DECLARE str varchar(100000) default '';           DECLARE level_m INTEGER DEFAULT 0;    DECLARE rootId varchar(100) default '';        DECLARE rootId_mid varchar(100) default '';    -- 创建自定义控制游标循环变量      DECLARE done TINYINT DEFAULT FALSE;      -- 创建自定义游标 并输入结果集      DECLARE my_cursor CURSOR FOR SELECT comcode from xj_prpdcompany ;    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;                  DROP table if exists str_spilt_result;        CREATE TEMPORARY TABLE str_spilt_result(`id` int(11) NOT NULL AUTO_INCREMENT,code VARCHAR(20),cname VARCHAR(10000),level_n int(4),PRIMARY KEY (`id`));          -- 打开游标      OPEN my_cursor;      -- 循环开始      my_loop: LOOP          FETCH NEXT FROM my_cursor INTO rootId;                IF done THEN                          LEAVE my_loop;                  END IF;                   set str=rootId;                set rootId_mid=rootId;                set level_m=0;                -- 这里做你想做的循环的事件                WHILE rootId_mid !='' and rootId is not NULL  do                          SET fid =(SELECT supercomcode FROM xj_prpdcompany WHERE comcode = rootId_mid);                           IF fid is not null THEN                                   SET str = concat(str, ',', fid);                                   set level_m =level_m+1;                        END IF;                           SET rootId_mid = fid;                                           END WHILE;                                            insert into str_spilt_result(code,cname,level_n) values(rootId,str,level_m);                 END LOOP my_loop;        COMMIT;    CLOSE my_cursor;    -- 关闭游标              select * from str_spilt_result;        update xj_prpdcompany p,str_spilt_result t set p.supercomcode=t.cname,p.`level`=t.level_n where p.comcode=t.code;        COMMIT;END