thetool/application/WorkflowExport/WorkflowExport.php

<?php

class WorkflowExport extends mfBaseModel {
  
  public function loadByUid($uid) {
    if(!$uid) {
      return false;
    }
    
    $uid = $this->db->escape($uid);
    
    $res = $this->db->select("WorkflowExport", "*", "uid='$uid' ORDER BY id DESC LIMIT 1");
    if($this->db->num_rows($res)) {
      $this->load($this->db->fetch_object($res));
    }
  }
}