title: Nhibernate - Map a single row table
body: <p>I have an existing nhibernate web application and I'm about to add a configuration table that will contain all system wide configuration options. This table will always contain one and only one row. Each column will contain one configuration property. I plan on having a domain object that will have a matching property for each column in the table. The users will be able to modify the values for each property in an admin screen. I plan on populating the table with one row during installation, setting initial values for each configuration option. My questions are as follows:</p>
  
  <p>1) I only want the system to update the existing row, and want to block any deletes or inserts on the table. I can, of course, enforce this by not creating application tier functions that do deletes or updates, but I wondered if NHibernate had some built in mapping or configuration options to help. I'd prefer to not have to do this at the database level since we are writing a database agnostic application, and so far, have not had to write any database platform specific code or scripts.</p>
  
  <p>2) Would the mapping be different for this class than my other "normal" classes?</p>