如何添加两个游标值并更新表
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【中文标题】如何添加两个游标值并更新表【英文标题】：How to add two cursor values and UPDATE the table 【发布时间】：2016-01-05 13:43:03 【问题描述】：我想在vehicle_id 和vehicleno 应该相同的位置添加两个游标值，然后更新表。
示例：
1.value from cur2 , totkm_t
2.value from cur3 , totkm_l
我想添加这两个，即
totkm_f = totkm_t + ktotm_l
然后
update fuelavg SET totkm=totkm_f where vid=vid_l;
我也希望对其他存储泵进行此类添加，但我的存储过程返回空值。
DELIMITER $$
DROP PROCEDURE IF EXISTS `searchvehicle`.`fuelavg`$$
CREATE DEFINER=`root`@`localhost` PROCEDURE `fuelavg`(IN startdate DATE, IN enddate DATE)
BEGIN
DECLARE vname_c VARCHAR(40);
DECLARE vnostring_c varchar(30);
DECLARE vowner_c varchar(40);
DECLARE vid_c,vmax_c,vmin_c,vcmpny_c,vtype_c INT;
DECLARE done INT DEFAULT FALSE;
DROP TABLE IF EXISTS fuelavg;
CREATE TABLE fuelavg
(
id int not null auto_increment primary key,
vid int,
vname varchar(40),
vnostring varchar(30),
v_type int,
vowner varchar(40),
store int,
pump int,
other int,
totfuel int,
totkm int,
vehavrg float,
cmpnyavg int,
maxavg int,
minavg int
);
BLOCK1: BEGIN
DECLARE CUR1 CURSOR FOR SELECT vehicle_owner.vid,vehicle_owner.vname, vehicle_owner.vowner,vehicle_owner.vnostring,vehicle_owner.vtype,vehicle_owner.vcompnyavg,vehicle_owner.maxavg,vehicle_owner.minavg FROM vehicle_owner;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=TRUE;
OPEN CUR1;
READ_LOOP: LOOP
FETCH CUR1 INTO vid_c,vname_c,vowner_c,vnostring_c,vtype_c,vcmpny_c,vmax_c,vmin_c;
IF done THEN LEAVE READ_LOOP;
END IF;
SET autocommit=0;
INSERT INTO fuelavg(vid,vname,vnostring,vowner,v_type,cmpnyavg, maxavg,minavg)values(vid_c,vname_c,vnostring_c,vowner_c,vtype_c,vcmpny_c,vmax_c,vmin_c);
END LOOP;
CLOSE CUR1;
END BLOCK1;
BLOCK2: BEGIN
DECLARE vid_t,totkm_t,store_t,pump_t,other_t INT;
DECLARE vnostring_t VARCHAR(30);
DECLARE indate_t,outdate_t DATE DEFAULT FALSE;
DECLARE vid_l,totkm_l,store_l,pump_l,other_l INT;
DECLARE vnostring_l VARCHAR(30); `enter code here`
DECLARE vid_f,totkm_f,store_f,pump_f,other_f INT;
DECLARE vnostring_f VARCHAR(30);
DECLARE done INT DEFAULT FALSE;
DECLARE CUR2 CURSOR FOR SELECT logentry.vid,logentry.vnostring,sum(logentry.totkm),sum(logentry.other),sum(logentry.store),sum(logentry.pump) FROM logentry WHERE indate>=startdate and indate<=enddate group by vid,vnostring;
DECLARE CUR3 CURSOR FOR SELECT logentry.vid,logentry.vnostring,sum(logentry.totkm),sum(logentry.store),sum(logentry.other),sum(logentry.pump) FROM LOGENTRY WHERE INDATE<=(SELECT MAX(INDATE) FROM LOGENTRY WHERE TANKFULL=1 AND INDATE<startdate)AND tankfull=1 GROUP BY VID;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=TRUE;
OPEN CUR2;
OPEN CUR3;
READ_LOOP: LOOP
FETCH CUR2 INTO vid_t,vnostring_t,totkm_t,other_t,store_t,pump_t;
IF done THEN LEAVE READ_LOOP;
END IF;
FETCH CUR3 INTO vid_l,vnostring_l,totkm_l,other_l,store_l,pump_l;
IF done THEN LEAVE READ_LOOP;
END IF;
UPDATE fuelavg SET totkm=(totkm_t+totkm_l),other=(other_t+other_l),store=(store_t+store_l),pump=(pump_t+pump_l) WHERE vid=vid_t AND vnostring=vnostring_t;
IF done THEN LEAVE READ_LOOP;
END IF;
SET autocommit=1;
END LOOP;
CLOSE CUR2;
CLOSE CUR3;
END BLOCK2;
select * from fuelavg;
此处附加的输出文件，当前上述查询显示空值。
【问题讨论】：
请为您的问题提供正确的格式。 你刚刚浪费了你的 50 赏金。 【参考方案1】：最后，我的努力取得了成果。以下是我通过添加两个游标值来更新表格的代码。
DELIMITER $$
DROP PROCEDURE IF EXISTS `searchvehicle`.`fuelavg2`$$
CREATE DEFINER=`root`@`localhost` PROCEDURE `fuelavg2`(IN startdate DATE, IN enddate DATE)
BEGIN
DECLARE vname_c VARCHAR(40);
DECLARE vnostring_c varchar(30);
DECLARE vowner_c varchar(40);
DECLARE vid_c,vmax_c,vmin_c,vcmpny_c,vtype_c INT;
DECLARE done INT DEFAULT FALSE;
DROP TABLE IF EXISTS fuelavg;
CREATE TABLE fuelavg
(
id int not null auto_increment primary key,
vid int,
vname varchar(40),
vnostring varchar(30),
v_type int,
vowner varchar(40),
store int,
pump int,
other int,
totfuel int,
totkm int,
vehavrg int,
cmpnyavg int,
maxavg int,
minavg int
);
BLOCK1: BEGIN
DECLARE CUR1 CURSOR FOR SELECT vehicle_owner.vid,vehicle_owner.vname,vehicle_owner.vowner,vehicle_owner.vnostring,vehicle_owner.vtype,vehicle_owner.vcompnyavg,vehicle_owner.maxavg,vehicle_owner.minavg FROM vehicle_owner;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=TRUE;
OPEN CUR1;
READ_LOOP: LOOP
FETCH CUR1 INTO vid_c,vname_c,vowner_c,vnostring_c,vtype_c,vcmpny_c,vmax_c,vmin_c;
IF done THEN LEAVE READ_LOOP;
END IF;
SET autocommit=0;
INSERT INTO fuelavg(vid,vname,vnostring,vowner,v_type,cmpnyavg, maxavg,minavg)values(vid_c,vname_c,vnostring_c,vowner_c,vtype_c,vcmpny_c,vmax_c,vmin_c);
END LOOP;
CLOSE CUR1;
END BLOCK1;
BLOCK2: BEGIN
DECLARE vid_t,totkm_t,store_t,pump_t,other_t INT;
DECLARE vnostring_t VARCHAR(30);
DECLARE indate_t,outdate_t DATE DEFAULT FALSE;
DECLARE vid_l,totkm_l,store_l,pump_l,other_l INT;
DECLARE vnostring_l VARCHAR(30);
DECLARE vid_f,totkm_f,store_f,pump_f,other_f INT;
DECLARE vnostring_f VARCHAR(30);
DECLARE vid_a,totfuel_a INT;
DECLARE vehavrg_a INT;
DECLARE vnostring_a VARCHAR(30);
DECLARE done,done3,done2,done5 INT DEFAULT FALSE;
DECLARE CUR2 CURSOR FOR SELECT logentry.vid,logentry.vnostring,sum(logentry.totkm),sum(logentry.other),sum(logentry.store),sum(logentry.pump) FROM logentry WHERE indate>=startdate and indate<=enddate group by vid,vnostring;
DECLARE CUR4 CURSOR FOR SELECT logentry.vid,logentry.vnostring,sum(logentry.totkm),sum(logentry.other),sum(logentry.store),sum(logentry.pump) FROM logentry WHERE indate>=startdate and indate<=enddate group by vid,vnostring;
DECLARE CUR3 CURSOR FOR SELECT logentry.vid,logentry.vnostring,sum(logentry.totkm),sum(logentry.store),sum(logentry.other),sum(logentry.pump) FROM LOGENTRY WHERE INDATE<=(SELECT MAX(INDATE) FROM LOGENTRY WHERE TANKFULL=1 AND INDATE<startdate)AND tankfull=1 GROUP BY VID;
OPEN CUR2;
BLOCK5:BEGIN
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=TRUE;
OPEN CUR4;
/* update table by value of traversing the tankfull of last month */
READ_LOOP5:LOOP
FETCH CUR4 INTO vid_t,vnostring_t,totkm_t,other_t,store_t,pump_t;
IF done THEN LEAVE READ_LOOP5;
END IF;
UPDATE fuelavg SET totkm=totkm_t,other=other_t,store=store_t,pump=pump_t WHERE vid=vid_t;
IF done THEN LEAVE READ_LOOP5;
END IF;
END LOOP READ_LOOP5;
END BLOCK5;
BLOCK3:BEGIN
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done3=TRUE;
OPEN CUR3;
READ_LOOP3:LOOP
FETCH CUR3 INTO vid_l,vnostring_l,totkm_l,other_l,store_l,pump_l;
IF done3 THEN LEAVE READ_LOOP3;
END IF;
/**********************/
/* update table by value of traversing the tankfull of last month */
BLOCK4:BEGIN
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done2=TRUE;
READ_LOOP2:LOOP
FETCH CUR2 INTO vid_t,vnostring_t,totkm_t,other_t,store_t,pump_t;
IF done3 THEN LEAVE READ_LOOP2;
END IF;
UPDATE fuelavg SET totkm=totkm_t+totkm_l,other=other_t+other_l,store=store_t+store_l,pump=pump_t+pump_l WHERE vid=vid_t AND vid=vid_l ;
IF done2 THEN LEAVE READ_LOOP2;
END IF;
END LOOP READ_LOOP2;
END BLOCK4;
/**********************/
END LOOP READ_LOOP3;
END BLOCK3;
/* calculate totfuel,averge*/
BLOCK5:BEGIN
DECLARE CUR5 CURSOR FOR SELECT fuelavg.vid,fuelavg.vnostring,(SUM(fuelavg.other) + SUM(fuelavg.pump) + SUM(fuelavg.store)) AS 'tot_fuel',(SUM(fuelavg.totKM)/ (SUM(fuelavg.other)+SUM(fuelavg.pump)+SUM(fuelavg.store))) AS 'veh_avrg' FROM fuelavg group by vid,vnostring;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done5=TRUE;
OPEN CUR5;
READ_LOOP6:LOOP
FETCH CUR5 INTO vid_a,vnostring_a,totfuel_a,vehavrg_a;
IF done5 THEN LEAVE READ_LOOP6;
END IF;
UPDATE fuelavg SET totfuel=totfuel_a,vehavrg=vehavrg_a WHERE vid=vid_a AND vnostring=vnostring_a;
IF done5 THEN LEAVE READ_LOOP6;
END IF;
END LOOP READ_LOOP6;
CLOSE CUR5;
END BLOCK5;
/**********************/
CLOSE CUR3;
CLOSE CUR2;
CLOSE CUR4;
END BLOCK2;
select * from fuelavg;
END$$
DELIMITER ;`
【讨论】：
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