public static function get_by_order($education_id)
 {
     $q = new query(RUDE_DATABASE_TABLE_EDUCATION_ITEMS_VALUES);
     $q->where('education_id', (int) $education_id);
     $q->order_by('order_num', 'ASC');
     $q->query();
     return $q->get_object_list();
 }
 public static function get($id = null)
 {
     $q = new query(RUDE_DATABASE_TABLE_SPECIALIZATIONS);
     if ($id !== null) {
         $q->where(RUDE_DATABASE_FIELD_ID, (int) $id);
         $q->query();
         return $q->get_object();
     }
     $q->order_by(RUDE_DATABASE_FIELD_NAME);
     $q->query();
     return $q->get_object_list();
 }