public function getWorktype($con = null)
 {
     include_once 'lib/model/om/BaseWorktypePeer.php';
     if ($this->aWorktype === null && $this->worktype_id !== null) {
         $this->aWorktype = WorktypePeer::retrieveByPK($this->worktype_id, $con);
     }
     return $this->aWorktype;
 }