mysql trigger example
-- The following statement creates an AFTER UPDATE trigger on the sales table: DELIMITER $$ CREATE TRIGGER after_sales_update AFTER UPDATE ON sales FOR EACH ROW BEGIN IF OLD.quantity <> new.quantity THEN INSERT INTO SalesChanges(salesId,beforeQuantity, afterQuantity) VALUES(old.id, old.quantity, new.quantity); END IF; END$$ DELIMITER ;
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$$
trigger in mysql syntax
CREATE TRIGGER trigger_name {BEFORE | AFTER} {INSERT | UPDATE| DELETE } ON table_name FOR EACH ROW trigger_body;
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