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 ;
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