INSERT INTO carrello(session, user, prodotto, quantita, ip, data_aggiunta) VALUES ('f255e05a68d095b05ec92a435819ae6a', , 251, 1, '54.227.104.40', 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 ' 251, 1, '54.227.104.40', NOW() ) ON DUPLICATE KEY UPDATE user=user' at line 1