C# zapisywanie obiektu w bazie danych

 string connString = ConfigurationManager.ConnectionStrings["default"].ConnectionString;
 using (var conn = new MySqlConnection(connString))
 {
      conn.Open();
      var comm = conn.CreateCommand();
      comm.CommandText = "INSERT INTO room(person,address) VALUES(@person, @address)";
      comm.Parameters.AddWithValue("?person", "Myname");
      comm.Parameters.AddWithValue("?address", "Myaddress");
      comm.ExecuteNonQuery();
  }

 public class Customer
    {
        public Customer()
        {
           // MemberSince = DateTime.UtcNow;
            Orders = new HashSet<Order>();
        }

        public virtual Guid Id { get; set; }
        public virtual string Imie { get; set; }
        public virtual string Nazwisko { get; set; }
        public virtual double AverageRating { get; set; }
        public virtual int Points { get; set; }

        public virtual bool HasGoldStatus { get; set; }
       // public virtual DateTime MemberSince { get; set; }
        public virtual CustomerCreditRating CreditRating { get; set; }
        public virtual Location Address { get; set; }// <-----

        public virtual ISet<Order> Orders { get; set; }

        public virtual void AddOrder(Order order)
        {
            Orders.Add(order);
            order.Customer = this;
        }


        public override string ToString()
        {
            var result = new StringBuilder();

           // result.AppendFormat("{1} {2} ({0})\r\n\tPoints: {3}\r\n\tHasGoldStatus:{ 4}\r\n\tMemberSince: { 5} ({ 7})\r\n\tCreditRating: { 6}\r\n\tAverageRating:{ 8}\r\n",
             //   Id, Imie, Nazwisko, Points, HasGoldStatus, MemberSince, CreditRating, MemberSince.Kind, AverageRating);
           // result.AppendLine("\tOrders:");

            foreach (var order in Orders)
            {
                result.AppendLine("\t\t" + order);
            }

            return result.ToString();
        }


    }

    public class Location
    {
        public virtual string Street { get; set; }
        public virtual string City { get; set; }
        public virtual string Province { get; set; }
        public virtual string Country{ get; set; }
    }

    public enum CustomerCreditRating
    {
        Excelent,
        VeryGood,
        Good
    }

 public class Order
    {
        public virtual Guid Id { get; set; }
        public virtual DateTime Ordered { get; set; }
        public virtual DateTime? Shipped { get; set; }
        public virtual Location ShipTo { get; set; }
        public virtual Customer Customer { get; set; }

        public override string ToString()
        {
            return string.Format("Order Id: {0}", Id);
        }
    }

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns = "urn:nhibernate-mapping-2.2" assembly = "Test_NHibernate"
   namespace = "Test_NHibernate">

  <class name = "Customer">

    <id name = "Id">
      <generator class = "guid.comb"/>
    </id>

    <property name = "Imie"/>
    <property name = "Nazwisko"/>
    <property name = "AverageRating"/>
    <property name = "Points"/>
    <property name = "HasGoldStatus"/>
    <!-- <property name = "MemberSince" type = "UtcDateTime"/> -->
    <property name = "CreditRating" />  <!--  column="CreditRating" type = "CustomerCreditRatingType"  -->

    <component name = "Address">
      <property name = "Street"/>
      <property name = "City"/>
      <property name = "Province"/>
      <property name = "Country"/>
    </component>

  </class>
</hibernate-mapping>

<?xml version="1.0" encoding="utf-8" ?>

<hibernate-mapping xmlns = "urn:nhibernate-mapping-2.2" assembly = "Test_NHibernate"
   namespace = "Test_NHibernate">

  <class name = "Order" table = "Order">

    <id name = "Id">
      <generator class = "guid.comb"/>
    </id>

    <property name = "Ordered"/>
    <property name = "Shipped"/>

    <component name = "ShipTo">
      <property name = "Street"/>
      <property name = "City"/>
      <property name = "Province"/>
      <property name = "Country"/>
    </component>

    <!--<many-to-one name = "Customer" column = "CustomerId" cascade =
         "save-update"/>-->

  </class>
</hibernate-mapping>

 private void RelacjeBtn_Click(object sender, RoutedEventArgs e)
        {
            var cfg = new Configuration();
                       
            
            cfg.DataBaseIntegration(x =>
            {
                x.ConnectionString = "server=localhost;user=root; password=fajnabmw123;database=bazaNHibernate";
                x.Driver<MySqlDataDriver>();
                x.Dialect<MySQL5Dialect>();
                x.IsolationLevel = IsolationLevel.RepeatableRead;
                x.Timeout = 10;
                x.BatchSize = 10;

            });

            cfg.SessionFactory().GenerateStatistics();
            cfg.AddAssembly(Assembly.GetExecutingAssembly());

            var sessionFactory = cfg.BuildSessionFactory();

            Guid id;
            using (var session = sessionFactory.OpenSession())

            using (var tx = session.BeginTransaction())
            {
                var newCustomer = CreateCustomer();
                session.Save(newCustomer);
                id = newCustomer.Id;
                tx.Commit();
            }

            using (var session = sessionFactory.OpenSession())

            using (var tx = session.BeginTransaction())
            {
                var reloaded = session.Load<Customer>(id);
                Console.WriteLine("Reloaded:");
                Console.WriteLine(reloaded);
                tx.Commit();
            }



        }



        private static Customer CreateCustomer()
        {

            var customer = new Customer
            {
                Imie = "John",
                Nazwisko = "Doe",
                Points = 100,
                HasGoldStatus = true,
                //MemberSince = new DateTime(2012, 1, 1),
                CreditRating = CustomerCreditRating.Good,
                AverageRating = 42.42424242,
                Address = CreateLocation()
            };

            var order1 = new Order
            {
                Ordered = DateTime.Now
            };

            customer.AddOrder(order1);

            var order2 = new Order
            {
                Ordered = DateTime.Now.AddDays(-1),
                Shipped = DateTime.Now,
                ShipTo = CreateLocation()
            };

            customer.AddOrder(order2);
            return customer;
        }

        private static Location CreateLocation()
        {

            return new Location
            {
                Street = "123 Somewhere Avenue",
                City = "Nowhere",
                Province = "Alberta",
                Country = "Canada"
            };
        }