Question

MySql trigger is very interesting, but very tricky.

I have some problem, I want to run a trigger once after insert on .
I want to run my trigger once after rows inserted, is there anything like for each table“???

how to make this trigger run only once, but not for each row created.

CREATE
DEFINER=`root`@`localhost`
TRIGGER `mydb`.`leave_taken_trigger`
AFTER INSERT ON `mydb`.`leave`
FOR EACH ROW
BEGIN
    set @lt:= (SELECT count(*) FROM `leave` where  (staff_leave_application_staff_id_staff = new.staff_leave_application_staff_id_staff and leave_type_id_leave_type = new.leave_type_id_leave_type) and active = 1 );

        INSERT INTO `leave_taken`(leave_type_id_leave_type, staff_id_staff, taken_days, updated) 
        VALUES (new.leave_type_id_leave_type, new.staff_leave_application_staff_id_staff, IFNULL(@lt,0), CURDATE())
        ON DUPLICATE KEY UPDATE taken_days=IFNULL(@lt,0), updated = CURDATE(); 

END$$

Answer 1

I think you can’t achieve your requirement with trigger.
Your trigger will run in every row created.
I suggest you to using stored procedure from your code after the INSERT has successfully completed.