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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