# Shop Delivery Region



DROP TRIGGER IF EXISTS before_insert_Shop_Region;
DROP TRIGGER IF EXISTS before_update_Shop_Region;


DELIMITER //
CREATE TRIGGER before_insert_Shop_Region
BEFORE INSERT ON Shop_Region
FOR EACH ROW
BEGIN
	SET NEW.created_on = NOW();
    SET NEW.created_by = CURRENT_USER();
END //
DELIMITER ;


DELIMITER //
CREATE TRIGGER before_update_Shop_Region
BEFORE UPDATE ON Shop_Region
FOR EACH ROW
BEGIN
	IF OLD.id_change_set <=> NEW.id_change_set THEN
		SIGNAL SQLSTATE '45000'
        SET MESSAGE_TEXT = 'New change Set ID must be provided.';
    END IF;
    
    INSERT INTO Shop_Region_Audit (
		id_region,
        name_field,
        value_prev,
        value_new,
        id_change_set
    )
    # Changed code
	SELECT NEW.id_region, 'code', OLD.code, NEW.code, NEW.id_change_set
		WHERE NOT OLD.code <=> NEW.code
    UNION
    # Changed name
	SELECT NEW.id_region, 'name', OLD.name, NEW.name, NEW.id_change_set
		WHERE NOT OLD.name <=> NEW.name
    UNION
    # Changed active
	SELECT NEW.id_region, 'active', CONVERT(OLD.active, CHAR), CONVERT(NEW.active, CHAR), NEW.id_change_set
		WHERE NOT OLD.active <=> NEW.active
    UNION
    # Changed display_order
	SELECT NEW.id_region, 'display_order', CONVERT(OLD.display_order, CHAR), CONVERT(NEW.display_order, CHAR), NEW.id_change_set
		WHERE NOT OLD.display_order <=> NEW.display_order
    ;
END //
DELIMITER ;