Question

I’m looking for a solution in order to perform some “Entity History”.
Basically i’ve a domain like this:

public class Order
{
    public virtual int OrderId { get; set; }
    public virtual DateTime Date { get; set; }
    public virtual ICollection<OrderItem> Items { get; set; }

    public virtual int Version { get; set; }
}

public class OrderItem
{
    public virtual int OrderItemId { get; set; }
    public virtual Order Order { get; set; }
    public virtual Product Product { get; set; }
    public virtual int Quantity { get; set; }

    public virtual int Version { get; set; }
}

I need to keep history of these entities in order to prevent from dependent entities updates like product changes (names, etc..)

So i want to create a new entity on each save/update with an updated version number.

My repository method GetOrderById should take care of entity versions and take the latest version or a specific version if specified.

How can i perform that? Maybe using NHibernate Interceptors?

Answer 1

You can use evenlisteners. You can use it to get different behavior for the loads and save/delete/updates.

Eventlisteners for data audit