mysql create trigger
CREATE
TRIGGER `event_name` BEFORE/AFTER INSERT/UPDATE/DELETE
ON `database`.`table`
FOR EACH ROW BEGIN
-- trigger body
-- this code is applied to every
-- inserted/updated/deleted row
END;
CREATE
TRIGGER `blog_after_insert` AFTER INSERT
ON `blog`
FOR EACH ROW BEGIN
IF NEW.deleted THEN
SET @changetype = 'DELETE';
ELSE
SET @changetype = 'NEW';
END IF;
INSERT INTO audit (blog_id, changetype) VALUES (NEW.id, @changetype);
END$$