MySQL stored procedure-->Migrate data to history table through cursor traversal and exception handling

-- Large table data migration,Every morning1 Click to 5 and click to execute, the execution interval is 10 minutes, migrate old data to the history table.

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)),&#39;-&#39;,MONTH(DATE_ADD(NOW(),INTERVAL -1 MONTH )),&#39;-&#39;,
         DAY(DATE_ADD(NOW(),INTERVAL-1 MONTH ))) LIMIT 1000;  
   DECLARE EXIT HANDLER FOR SQLSTATE &#39;02000&#39;  /**包含游标not found*/
   BEGIN
        SET STOP=1;
         INSERTINTO db_logs(log_type,table_name,action_name,log_msg,create_time)
         SELECT1, &#39;oal_xxx&#39;,&#39;pro_oal_log_move&#39;,CONCAT(&#39;primary key:&#39;,p_oalid,&#39; 游标执行正常结束！&#39;),NOW();       
   END;
       
   DECLARE EXIT HANDLER FOR SQLEXCEPTION
   BEGIN
         SETSTOP=1;
         INSERTINTO db_logs(log_type,table_name,action_name,log_msg,create_time)
         SELECT2, &#39;oal_xxx&#39;,&#39;pro_oal_log_move&#39;,CONCAT(&#39;primary key:&#39;,p_oalid,&#39; 移动执行失败&#39;),NOW();
   END; 
   
   OPEN cur_oalid;

                                                                                                                                                                                                     

## -- This is to determine whether the cursor has reached the end

FETCH cur_oalid INTO p_oalid;

--

Perform data migration

 WHILE STOP <> 1 DO 
         -- select p_id;
         START TRANSACTION;

                                                                                                                                                                                                  

   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;

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