Question

I want to trigger create new rows in b table when a row is inserted to a table.

I have a table staff_leave_application like this:

id |  staff     |   leave type  | start date | end date       |  is half  |
---+------------+---------------+------------+----------------+-----------+
 1 | John Doe   |  Casual Leave | 17/01/2013 | 20/01/2013     |     0     |

if a row is inserted in this table, then it will trigger and insert to another table leave

the data to be inserted to leave table:

Split date range start date – end date to day, like :

17/01/2013 - 20/01/2013 will be

17/01/2013
18/01/2013
19/01/2013
20/01/2013

now insert per day to per row of leave table, along with staff_leave_applications column ID, staff, leave type.

I followed @Shaharsh shah’s answer and got this, thanks to Sharsh.

DELIMITER $$

USE `mydb`$$

CREATE
    /*!50017 DEFINER = 'root'@'localhost' */
    TRIGGER `tn_air_staff_leave_application` AFTER INSERT ON `staff_leave_application` 
    FOR EACH ROW BEGIN
        SET @counter := -1; 
        WHILE (@counter < DATEDIFF(DATE(new.end_date), DATE(new.start_date))) DO 
            INSERT INTO `leave`(staff_id_staff, leave_type_id_leave_type, staff_leave_application_id_staff_leave_application, leave_date) 
            VALUES (new.staff_id_staff, new.leave_type_id_leave_type, new.id_staff_leave_application, DATE_ADD(new.start_date, INTERVAL @counter:=@counter + 1 DAY)); 
        END WHILE; 
END;
$$

Answer 1

Try this:

DELIMITER $$

DROP TRIGGER /*!50032 IF EXISTS */ `tn_air_staff_leave_application`$$

CREATE
    /*!50017 DEFINER = 'root'@'localhost' */
    TRIGGER `tn_air_staff_leave_application` AFTER INSERT ON `staff_leave_application` 
    FOR EACH ROW BEGIN
        SET @counter := -1; 
        WHILE (@counter < DATEDIFF(DATE(new.endDate), DATE(new.startDate))) DO 
            INSERT INTO `leave`(staffId, leaveType, leaveDate) 
            VALUES (new.id, new.leaveType, DATE_ADD(new.startDate, INTERVAL @counter:=@counter + 1 DAY)); 
        END WHILE; 
END;
$$

DELIMITER ;

DELETE Trigger

DELIMITER $$

DROP TRIGGER /*!50032 IF EXISTS */ `tn_adr_staff_leave_application`$$

CREATE
    /*!50017 DEFINER = 'root'@'localhost' */
    TRIGGER `tn_adr_staff_leave_application` AFTER DELETE ON `staff_leave_application` 
    FOR EACH ROW BEGIN
          DELETE FROM `leave` WHERE staffId = old.id;
END;
$$

DELIMITER ;