How to best design the entity data classes for the following SQL Schema? - nhibernate

Question

I have the following database schema:
http://lh4.ggpht.com/_SDci0Pf3tzU/SdM3XnAmmxI/AAAAAAAAEps/Ie3xW3ZVNfQ/styleerror.png
The issue is how to create the entity data class in Nhibernate?
Is this better:
public class Store
{
public virtual int Id { get; private set; }
public virtual string Name { get; set; }
public virtual IList<Product> Products { get; set; }
public virtual IList<Employee> Staff { get; set; }
}
public class Employee
{
public virtual int Id { get; private set; }
public virtual string FirstName { get; set; }
public virtual string LastName { get; set; }
public virtual Store Store { get; set; }
}
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; private set; }
}
Or is this better?
public class Store
{
public virtual int Id { get; private set; }
public virtual string Name { get; set; }
}
public class Employee
{
public virtual int Id { get; private set; }
public virtual string FirstName { get; set; }
public virtual string LastName { get; set; }
public virtual Store Store { get; set; }
}
public class Product
{
public virtual int Id { get; private set; }
public virtual string Name { get; set; }
public virtual double Price { get; set; }
}
public class StoreProduct
{
public virtual List<Product> Products{get;set;}
public virtual List<Store> Stores{get;set;};
}
I think the first one is easier to understand than the second, isn't it?

Answer 1

If you modify the 'StoreProduct' table, so that it has no surrogate primary key, but a primary key which exists of the 2 foreign key columns (ProductId & StoreId), then you can simply limit yourself to 3 entities:
- Employee
- Product
- Store
Your Store class could then have a Set of Products, which can simply be mapped as a many-to-many relationship.
public class Store
{
public int Id {get;set;}
public string Name {get;set;}
public ISet<Product> Products = new HashedSet<Product>();
}
And in the Store.hbm.xml mapping:
<set name="Products" table="StoreProducts">
<key column="Store_Id" />
<many-to-many class="Product" column="Product_Id" />
</set>
So, to answer your question: first option is better.