MYSQL存储过程中使用游标嵌套的实例

delimiter $$
drop procedure if exists findErrorLifeRoute $$
CREATE PROCEDURE findErrorLifeRoute() 
BEGIN
declare routeId,routeStopId BIGINT ; 
declare str,tmp_street VARCHAR(255) ; 
DECLARE l_done,num,life,localId,tmp_localId INT DEFAULT 0;
-- 声明两个游标，第二个游标使用到第一个的查询结果
DECLARE grade_csr cursor FOR SELECT route_id FROM routes where LIFE_CYCLE_STATUS<39998 and LIFE_CYCLE_STATUS>35001;
DECLARE class_csr cursor FOR SELECT LOCATION_INNER_ID,STREET FROM route_stops WHERE ROUTE_ID=routeId order by STOP_NUMBER asc;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET l_done=1;
 OPEN grade_csr;
-- 第一个循环
 grade_loop: LOOP -- Loop through org_grade
 FETCH grade_csr into routeId;
 IF l_done=1 THEN
 LEAVE grade_loop;
 END IF;
	SET num=0;
	set tmp_street=null;
	set tmp_localId=0;
 OPEN class_csr;
-- 第二个循环
 class_loop: LOOP -- Loop through class in grade.
 FETCH class_csr INTO localId,str;
 IF l_done=1 THEN
 LEAVE class_loop;
 END IF; 
 if localId =tmp_localId or (str is not null and str=tmp_street) THEN
	set tmp_street=str;
	set tmp_localId=localId;
	else
	set num=num+1;
	set tmp_street=str;
	set tmp_localId=localId;
	end if;	 
-- 结束第一个循环
 END LOOP class_loop;
 CLOSE class_csr;
 SET l_done=0;
	set life=36000+(num-1)*100+6; 
	INSERT into route_tmp (select ROUTE_ID,LIFE_CYCLE_STATUS,num,life,ACCOUNT_ID,str from routes r where r.ROUTE_ID=routeId and LIFE_CYCLE_STATUS=life );
-- 结束第二个循环
 END LOOP grade_loop;
 CLOSE grade_csr;
END $$
delimiter ;