INSERT INTO carrello(session, user, prodotto, quantita, ip, data_aggiunta) VALUES ('8ffb7c6e2f6869226f7afef8bb272486', , 524, 1, '54.82.112.193', 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 ' 524, 1, '54.82.112.193', NOW() ) ON DUPLICATE KEY UPDATE user=user' at line 1