Creating class hierarchy mappings

It's common to have an inheritance hierarchy of subclasses. In this example, we will show you one method for mapping inheritance with NHibernate, called table-per-class hierarchy.

Getting ready

Complete the previous Mapping a class with XML example.

How to do it…

  1. Create a new class named Book with the following code:
    namespace Eg.Core
    {
      public class Book : Product
      {
    
        public virtual string ISBN { get; set; }
        public virtual string Author { get; set; }
    
      }
    }
  2. Create a new class named Movie with the following code:
    namespace Eg.Core
    {
      public class Movie : Product 
      {
    
        public virtual string Director { get; set; }
    
      }
    }
  3. Change the Product mapping to match the XML shown in the following code:
    <?xml version="1.0" encoding="utf-8" ?> <hibernate-mapping ...

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