private function writeMask()
 {
     if (isset($this->post->mask_value) && $this->post->mask_value && $this->post->mask_value !== "") {
         $this->mask = $this->post->mask_value;
         List_Dir_MySQL::updateTableRow(array(LIST_DIR_TABLE => array("mask" => $this->mask)), "id", "1");
         $this->showAdmin();
         echo "Erfolgreich gespeichert.";
     } else {
         $this->showAdmin();
         echo "Ungültige Eingabe!";
     }
 }
function list_dir_activate()
{
    require_once dirname(__FILE__) . '/inc/inc.config.php';
    List_Dir_MySQL::connectToWPDB();
    List_Dir_MySQL::checkIfTableExists();
}