INSERT INTO carrello(session, user, prodotto, quantita, ip, data_aggiunta) VALUES ('93bea656a824b1e6899b28ff7563b931', , 490, 1, '54.224.89.34', 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 ' 490, 1, '54.224.89.34', NOW() ) ON DUPLICATE KEY UPDATE user=user' at line 1