INSERT INTO carrello(session, user, prodotto, quantita, ip, data_aggiunta) VALUES ('423f8ec78a994f02d065ef990a934cf6', , 518, 1, '54.91.16.95', NOW() ) ON DUPLICATE KEY UPDATE user=user
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ' 518, 1, '54.91.16.95', NOW() ) ON DUPLICATE KEY UPDATE user=user' at line 1