数据库|mysql教程
MYSQL,存储,过程中,使用,游标,嵌套,实例,MYSQL
数据库-mysql教程
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MYSQL存储过程中使用游标嵌套的实例 MySQL 存储过程 delimiter $$drop procedure if exists findErrorLifeRoute $$CREATE PROCEDURE findErrorLifeRoute() BEGINdeclare routeId,routeStopId BIGINT ; declare str,tmp_street VARCHAR(255) ; DECLARE l_done
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MYSQL存储过程中使用游标嵌套的实例
MySQL 存储过程
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delimiter $$drop procedure if exists findErrorLifeRoute $$CREATE PROCEDURE findErrorLifeRoute() BEGINdeclare 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_STATUS35001;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) THENset tmp_street=str;set tmp_localId=localId;elseset 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 ;
