mysql stored procedure example

CREATE PROCEDURE `pro_cancel_order`(
		IN orderId INT ,
		IN userId INT ,
		OUT resultStatus INT
)
	COMMENT 'Cancel item order'
BEGIN
	######Parameter Description#######
	#orderId order id
	#extras Extended Records

	-- exception handling
    DECLARE CONTINUE HANDLER  
        FOR 1062  
        SET resultStatus=500;-- exception
	SET resultStatus=0;
    START TRANSACTION; #declare transaction start

	#Modify the product order form
	#UPDATE `tos_goods_order` SET `order_status` =-1,`cancel_status` =2,`deleted` =1,`update_time` =now()
	UPDATE `tos_goods_order` SET `order_status` =-1,`cancel_status` =2,`update_time` =now()
	WHERE `id` = orderId;
	#Modify the order item table
	UPDATE `tos_goods_order_goods` SET `deleted` =1,`update_time` =now()
	WHERE `order_id` = orderId;
	#Order log table insert record
	INSERT INTO `tos_goods_order_log`(`order_id` ,`user_id` ,`old_status` ,`new_status`  , `remark`,`create_time`  )
    VALUES(orderId,userId,1,-1,'Cancel order',now());
	SET resultStatus=200;-- Order canceled successfully
	COMMIT;
	# rollback
    IF resultStatus=500 THEN
    	ROLLBACK;
	ELSE
    	COMMIT;
	END IF;

	SELECT resultStatus;#output parameters
	
END

 

Stored procedure traversal:

CREATE PROCEDURE `pro_time_cancel_order`()
	COMMENT 'Timely cancellation of product orders'
BEGIN	
	########TODO You need to query all unpaid orders over 15 minutes and cancel them ############
	DECLARE orderId INT;# order id
	DECLARE userId INT;# user id
	DECLARE goodsId INT;# product id
	DECLARE goodsNum INT;# number of goods
	
	## Traverse the data end flag
	DECLARE done INT DEFAULT FALSE;
	##Declaring the cursor##
	DECLARE cur_order CURSOR FOR SELECT g.`id`,g.`user_id`,g1.`goods_id`,g1.`num`  FROM `tos_goods_order` g JOIN `tos_goods_order_goods` g1 ON(g.`id`=g1.`order_id`) WHERE g.`order_status`=1 AND g.`deleted`=0 AND NOW()>DATE_ADD(g.`create_time`,INTERVAL 15 MINUTE);

	##Exception handling
	DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
	##Open the cursor
	OPEN cur_order;
	##assignment
	FETCH NEXT FROM cur_order INTO orderId,userId,goodsId,goodsNum;

	#traverse
	REPEAT
		IF NOT Done THEN
			##Release commodity inventory
			UPDATE `tos_goods` SET `store_count` = `store_count` +goodsNum WHERE `id`=goodsId;
			#Modify the product order form
			UPDATE `tos_goods_order` SET `order_status` =-1,`cancel_status` =2,`update_time` =now() WHERE `id` = orderId;
			#Order log table insert record
			INSERT INTO `tos_goods_order_log`(`order_id` ,`user_id` ,`old_status` ,`new_status` , `remark`,`create_time`  )
    		VALUES(orderId,userId,1,-1,'Cancel order',now());
			#Record cancellation order update time
			UPDATE `tos_sys_time_task` SET `update_time`=now() WHERE `id`=1;
			COMMIT;

        END IF;
		FETCH  NEXT from cur_order INTO orderId,userId,goodsId,goodsNum;
    UNTIL Done END REPEAT;

    ##Close the cursor
    CLOSE cur_order;

END

 

Events to execute the stored procedure periodically:

Check if event is enabled: show variables like '%sche%'; 

Turn on event scheduling: set global event_scheduler=1; 

Close the event task: alter event e_test ON COMPLETION PRESERVE DISABLE; 

Account opening event task: alter event e_test ON COMPLETION PRESERVE ENABLE; 

 

drop event `tosuser`.`e_time_cancel_order`;
CREATE EVENT `tosuser`.`e_time_cancel_order`
  ON SCHEDULE EVERY 60 SECOND
  STARTS  '2017-06-02 15:00:53'  ON COMPLETION PRESERVE  
  ENABLE  
  COMMENT 'Timely cancel order event'  
  DO begin
	/**Timely cancel the product order**/
	call pro_time_cancel_order();
end