INSERT INTO carrello(session, user, prodotto, quantita, ip, data_aggiunta) VALUES ('9e14c0ff7f0eae68a4d97256858bdb52', , 538, 1, '54.158.52.166', 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 ' 538, 1, '54.158.52.166', NOW() ) ON DUPLICATE KEY UPDATE user=user' at line 1