INSERT INTO carrello(session, user, prodotto, quantita, ip, data_aggiunta) VALUES ('865239d3eee739ee414d29b197bed8ea', , 652, 1, '54.167.15.6', 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 ' 652, 1, '54.167.15.6', NOW() ) ON DUPLICATE KEY UPDATE user=user' at line 1