public function __construct()
 {
     parent::__construct();
     $this->db3 = clone $this->db;
 }
 public function get_single(int $id)
 {
     $objects = parent::get(null, null, null, null, null, null, array($this->get_id_field_name() => $id));
     if (count($objects) > 0) {
         $keys = array_keys($objects);
         return $objects[$keys[0]];
     }
     return null;
 }