Question

Here is a simplified version of my database model. I have two tables: ‘Image’, and ‘HostingProvider’ which look like this:

[Image]

• id
• filename
• hostingprovider_id

[HostingProvider]

• id
• base_url

Image HostingproviderId is a many-to-one foreign key relationship to the HostingProvider table. (Each image has one hosting provider).

Essentially I want to be able to have my Image class look like this:

[Image]

• Id
• base_url
• filename

In NHibernate, how can I create a mapping file that will combine the base_url from the HostingProvider table, into the Image class?

Answer 1

What you’re looking for is this:

http://ayende.com/Blog/archive/2007/04/24/Multi-Table-Entities-in-NHibernate.aspx

Here’s a peek of what it looks like:

<class name='Person'>         <id name='Id' column='person_id' unsaved-value='0'>                <generator class='native'/>         </id>           <property name='Name'/>         <property name='Sex'/>           <join table='address'>                <key column='address_id'/>                <property name='Address'/>                <property name='Zip'/>                <property name='Country'/>                <property name='HomePhone'/>                <property name='BusinessPhone'/>         </join>  </class>