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;Copyright © 2021 Codeinu
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