INSERT INTO carrello(session, user, prodotto, quantita, ip, data_aggiunta) VALUES ('a4dcb5f738c5cdd266e3cf0b72320c95', , 244, 1, '54.80.8.44', 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 ' 244, 1, '54.80.8.44', NOW() ) ON DUPLICATE KEY UPDATE user=user' at line 1