NHibernate 4.x Cookbook - Second Edition

Extra lazy collections

Sometimes we only need to know the number of items in a collection. It may be for displaying purposes or some behavioral logic. Either way, it seems a bit resource intensive that we should have to load all of the entities from the database, just to count them. With extra lazy collections we can improve this situation a bit.

Getting ready

Refer to the Getting Ready section of this chapter instructions at the beginning of this chapter.

How to do it…

1. Add a new folder named ExtraLazy to the project.
2. Add a new class named Accessory to the folder, having the code:

   using NH4CookbookHelpers.Queries.Model;
   
   namespace QueryRecipes.ExtraLazy
   {
       public class Accessory : Entity
       {
           public virtual string Name { get; set; }
       }
   }

3. Add a new class named ...