INSERT INTO carrello(session, user, prodotto, quantita, ip, data_aggiunta) VALUES ('b8a81b85f8aa318a10bef2501e8ec084', , 278, 1, '54.80.123.20', 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 ' 278, 1, '54.80.123.20', NOW() ) ON DUPLICATE KEY UPDATE user=user' at line 1