问Fluent NHibernate没有实体类的持久化

EN

    private static ISessionFactory CreateSessionFactory()
    {
        try
        {   
            return Fluently.Configure()
                           .Database(MsSqlConfiguration.MsSql2008
                                .ConnectionString(c => c
                                    .Server("localhost")
                                    .Database("gisli")
                                    .TrustedConnection()).ShowSql())
                            .Mappings(m => { 
                                m.HbmMappings.AddFromAssemblyOf<Employee>(); 
                                m.HbmMappings.AddFromAssemblyOf<Store>();
                                m.HbmMappings.AddFromAssemblyOf<Product>();

                            })
                   .BuildSessionFactory();


        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
            if(e.InnerException !=null)
                Console.WriteLine(e.InnerException.Message);
                return null;
        }
    }

public class Product
{
    public virtual int Id { get; private set; }
    public virtual string Name { get; set; }
    public virtual double Price { get; set; }
    public virtual IList<Store> StoresStockedIn { get; set; }

    public Product()
    {
        StoresStockedIn = new List<Store>();
    }
}

public class ProductMap : ClassMap<Product>
{
    public ProductMap()
    {
        Id(x => x.Id);
        Map(x => x.Name);
        Map(x => x.Price);
        HasManyToMany(x => x.StoresStockedIn)
            .Cascade.All()
            .Inverse()
            .Table("StoreProduct");
    }
}

    private static ISessionFactory CreateSessionFactory()
    {
        return Fluently.Configure()
          .Database(MsSqlConfiguration.MsSql2008.ConnectionString(c =>             c.Server(".").Database("gisli").TrustedConnection()))
          .Mappings(m =>
            m.FluentMappings.AddFromAssemblyOf<Program>())
          .BuildSessionFactory();
    }