public static Customer addOrdersFromDB(Customer c) {
   Customer newCustomer = new Customer(c.getID());
   List<Order> orders = orderDAO.retrieveOrders(c);
   for (Order o : orders) {
     newCustomer.addOrder(o);
   }
   return newCustomer;
 }
 public static List<Order> retrieveUnpaidOrders(Customer customer) {
   List<Order> orders = orderDAO.retrieveUnpaidOrders(customer.getID());
   return orders;
 }