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