INSERT INTO carrello(session, user, prodotto, quantita, ip, data_aggiunta) VALUES ('c29fe8fb1295bd17dde79677a4add2d7', , 648, 1, '54.198.111.185', 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 ' 648, 1, '54.198.111.185', NOW() ) ON DUPLICATE KEY UPDATE user=user' at line 1