Question

I have a question about how to map a foreign key ID with NHibernate mapping file. eg. I have the following classes:

class Topic {
  public long ID {get; set;}  
  public string Name {get; set;}  
}  

class Post {  
  public long ID {get; set;}  
  public string Title {get; set;}  
  public string Content {get; set;}  
  public long TopicID {get; set;} // This is the FK refers to the Topic entity
}  

The Post entity doesn’t reference the Topic directly, it only references the Topic by the TopicID as show above. However seems that NHibernate <many-to-one> mapping will only map the Topic as an entity in the Post, but I what I want is the TopicID FK, not the Topic entity. Could anybody help me on this?

Many thanks!

Answer 1

You can just declare the TopicID as a property, and not a many-to-one.

<property name="TopicID" column="TopicID" type="Int64" />