INSERT INTO carrello(session, user, prodotto, quantita, ip, data_aggiunta) VALUES ('faa98aabc3eedb7458a72dba1c4b1796', , 248, 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 ' 248, 1, '54.227.104.40', NOW() ) ON DUPLICATE KEY UPDATE user=user' at line 1