try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection(CONNECTION_STRING);
            String sql = "SELECT name FROM Utenti WHERE username=? AND password=?;";
            preparedStatement=conn.prepareStatement(sql);
            preparedStatement.setString(1, username);
            preparedStatement.setString(2, password);
            rs = preparedStatement.executeQuery();
            if (rs.next()){
                result = rs.getString("name");
                System.out.println(result +" è questo");
            }
            else
                result = "Login incorrect";
        }