title: NHibernate 2 hbm2ddl.auto update not adding columns
body: <p>I wanted to add 2 columnts to an MSSQL table by changing class and mapping files, using:</p>
  
  <pre><code>&lt;property name="hbm2ddl.auto"&gt;update&lt;/property&gt;
  </code></pre>
  
  <p>According to the documentation, this should result in automatically calling something like this near the session start:</p>
  
  <pre><code>SchemaUpdate su = new SchemaUpdate(_cfg);
  su.Execute(true, true);
  </code></pre>
  
  <p>However, the columns are not there (unless I manually add these lines). What am I missing? Is it a bug in this NHibernate version or ...?</p>
  
  <p>Thanks</p>
  
  <p>v.</p>
  
  <p>UPDATE: Certain sources mention update as a valid option, while others only offer create and create-drop. Is this the answer?</p>