Question

Can someone please tell me what’s wrong with this sp. The logic seems to be ok, but when i check back in my table it doesn’t work at all.

    DELIMITER //
DROP PROCEDURE IF EXISTS add_zero_yearly_sales_proc //
CREATE PROCEDURE add_zero_yearly_sales_proc() 
READS SQL DATA
BEGIN 

DECLARE num_of_sales INT DEFAULT 0;
DECLARE last_ins_date DATETIME;
DECLARE done INT DEFAULT 0;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;

SET last_ins_date = DATE_SUB(NOW(), INTERVAL 2 YEAR);

ins_loop: WHILE last_ins_date < NOW() DO
SELECT COUNT(sales_amount_sold) INTO num_of_sales
FROM yearly_sales
WHERE sales_date_sold BETWEEN DATE_FORMAT(last_ins_date,'%Y-%m-01 00:00:01') AND DATE_FORMAT(LAST_DAY(last_ins_date),'%Y-%m-%d 23:59:59');

IF num_of_sales = 0 THEN  

INSERT INTO yearly_sales(sales_date_sold, sales_amount_sold,sales_quantity) 
VALUES (CONCAT(DATE_FORMAT(last_ins_date,'%Y-%m-01 00:00:01')),0, 0);

END IF ;

SET num_of_sales = 0;
SET last_ins_date = DATE_ADD(last_ins_date, INTERVAL 1 MONTH);

END WHILE ins_loop;
SET done = 0;

END ;//
DELIMITER ;

I’ve created an event that fires every hour to call this procedure. The procedure is supposed to check if there are months in the yearly_sales table without any sales values in them, and if so add 0 values for the amount & quantity, and the beginning of the month for the date. I’ve checked back but it doesn’t seem to work.

Also here’s the event i created to call it hourly

    DELIMITER //  
CREATE    
EVENT `hourly_sales_evt`  
ON SCHEDULE EVERY 1 HOUR STARTS DATE_FORMAT(NOW(),'%Y-%m-%d %H:55:00')
ON COMPLETION PRESERVE
DO BEGIN 
    CALL add_zero_yearly_sales_proc();
END //
DELIMITER ;

Answer 1

May be global event scheduler is in stopped/disabled state.

To turn on event scheduler, run any of the following:

SET GLOBAL event_scheduler = ON;
SET @@global.event_scheduler = ON;
SET GLOBAL event_scheduler = 1;
SET @@global.event_scheduler = 1;

When the Event Scheduler is ON, the event scheduler thread is listed in the output of SHOW PROCESSLIST as a daemon process, and its state is represented as shown here:

mysql> SHOW PROCESSLIST\G
*************************** 1. row ***************************
     Id: 1
   User: root
   Host: localhost
     db: NULL
Command: Query
   Time: 0
  State: NULL
   Info: show processlist
*************************** 2. row ***************************
     Id: 2
   User: event_scheduler
   Host: localhost
     db: NULL
Command: Daemon
   Time: 3
  State: Waiting for next activation
   Info: NULL
2 rows in set (0.00 sec)

Once the Event Scheduler is set ON, you would see it working.

Refer to : MySQL Event Scheduler Configuration