doctrine2/tests/models/cms/CmsComment.php

<?php
class CmsComment extends Doctrine_Entity
{
  public static function initMetadata($class) 
  {
      $class->mapColumn('id', 'integer', 4, array('primary' => true, 'autoincrement' => true));
      $class->mapColumn('topic', 'string', 255);
      $class->mapColumn('text', 'string');
      $class->mapColumn('article_id', 'integer', 4);
  }
}