mysql批量更新存储过程_MYSQL 使用存储过程批量更新表数据

功能：实现将表result_good_city_dzl中的字段lat更新为表 result_good_city_lh中的lat，条件是两个表中的id一样

即：

update result_good_city_dzl a set a.lat=(select lat from result_good_city_lh b where a.id=b.id and b.lat!=0)

DELIMITER $$

DROP PROCEDURE IF EXISTS update_result_good_city_dzl $$

CREATE PROCEDURE `update_result_good_city_dzl`()

BEGIN

DECLARE LhId BIGINT;

DECLARE Lhlat VARCHAR(40);

declare stop int default 0;

DECLARE cur CURSOR FOR (SELECT lat,id FROM result_good_city_lh);

/*

定义游标的结束,当遍历完成时，将stop设置为null

这里也可以写成 DECLARE CONTINUE HANDLER FOR NOT FOUND SET stop = null;

*/

declare CONTINUE HANDLER FOR SQLSTATE '02000' SET stop = null;

/*开游标*/

OPEN cur;

/*游标向下走一步，将查询出来的两个值付给定义的两个变量*/

FETCH cur INTO Lhlat,LhId;

/* 循环体 */

WHILE ( stop is not null) DO

/*更新数据表*/

update result_good_city_dzl set lat=Lhlat where id = LhId ;

/*游标向下走一步*/

FETCH cur INTO Lhlat,LhId;

END WHILE;

/*关闭游标*/

CLOSE cur;

END$$

DELIMITER ;

update_result_good_city_dzl();

执行存储过程(sql命令行执行)

CALL update_result_good_city_dzl();

/* Affected rows: 0  已找到记录: 0  警告: 0  持续时间 1 query: 1.014 sec. */

执行时间1秒多

方法2：

DELIMITER $$

DROP PROCEDURE IF EXISTS update_result_good_city_dzl $$

CREATE PROCEDURE update_result_good_city_dzl()

BEGIN

DECLARE LhId INT;

DECLARE Lhlat VARCHAR(40);

DECLARE done INT;

-- 定义游标

DECLARE rs_cursor CURSOR FOR

SELECT lat,id FROM result_good_city_lh;

DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=1;

OPEN rs_cursor;

cursor_loop:LOOP

FETCH rs_cursor INTO Lhlat,LhId; -- 取数据

IF done=1 THEN

leave cursor_loop;

END IF;

-- 更新表

update result_good_city_dzl set lat=Lhlat where id = LhId ;

END LOOP cursor_loop;

CLOSE rs_cursor;

END$$

DELIMITER ;

执行存储过程(sql命令行执行)

CALL update_result_good_city_dzl();