title: Fluent nHibernate no identity column in table
body: <p>How do I specify with fluent NHibernate mapping for a table that doesn't have an identity column? </p>
  
  <p>I want something like this:</p>
  
  <pre><code>public sealed class CustomerNewMap : ClassMap&lt;CustomerNew&gt;, IMap
  {
      public CustomerNewMap()
      {
          WithTable("customers_NEW");
          Not.LazyLoad();
          Not.Id(); // this is invalid...
          Map(x =&gt; x.Username);
          Map(x =&gt; x.Company);
      }
  }
  </code></pre>
  
  <p>I mean no primary key defined in the database (not much defined in the database).</p>