MySQL存储过程-->通过游标遍历和异常处理迁移数据到历史表

-- 大表数据迁移,每天凌晨1点到5点执行,执行间隔时间10分钟，迁移旧数据到历史表。

DELIMITER $$

USE `dbx`$$

DROP PROCEDURE IF EXISTS `pro_xx`$$

CREATE  PROCEDURE `pro_xx`()

BEGIN

DECLARE p_oalid INT DEFAULT 0;

DECLARE STOP INT DEFAULT 0;

DECLARE cur_oalid CURSOR FOR

SELECToal.id FROM oal_xxx oal WHERE oal.`ymd` <CONCAT(YEAR(DATE_ADD(NOW(),INTERVAL -1 MONTH)),'-',MONTH(DATE_ADD(NOW(),INTERVAL -1 MONTH )),'-',DAY(DATE_ADD(NOW(),INTERVAL-1 MONTH ))) LIMIT 1000;

DECLARE EXIT HANDLER FOR SQLSTATE '02000'  /**包含游标not found*/

BEGIN

SET STOP=1;

INSERTINTO db_logs(log_type,table_name,action_name,log_msg,create_time)

SELECT1, 'oal_xxx','pro_oal_log_move',CONCAT('primary key:',p_oalid,' 游标执行正常结束！'),NOW();

END;

DECLARE EXIT HANDLER FOR SQLEXCEPTION

BEGIN

SETSTOP=1;

INSERTINTO db_logs(log_type,table_name,action_name,log_msg,create_time)

SELECT2, 'oal_xxx','pro_oal_log_move',CONCAT('primary key:',p_oalid,' 移动执行失败'),NOW();

END;

OPEN cur_oalid;

-- 读取一行数据到变量

FETCH cur_oalid INTO p_oalid;

-- 这个就是判断是否游标已经到达了最后

WHILE STOP <> 1 DO

-- select p_id;

START TRANSACTION;

--   进行数据迁移

REPLACE INTO oal_xxx_history SELECT oal.*FROM oal_xxx oal WHERE oal.id=p_oalid ;

DELETE FROM oal_xxx WHERE id=p_oalid;

-- INSERT INTO t (tid) VALUES (p_tid);

COMMIT;

-- 读取下一行的数据

FETCH cur_oalid INTO p_oalid;

END WHILE;

CLOSE cur_oalid; -- 关闭游标

END$$

DELIMITER ;