INSERT INTO carrello(session, user, prodotto, quantita, ip, data_aggiunta) VALUES ('34211bcf324a62075786a5e37d15d605', , 72, 1, '54.91.16.95', 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 ' 72, 1, '54.91.16.95', NOW() ) ON DUPLICATE KEY UPDATE user=user' at line 1