public function reload()
    {
        $this->_relations = array();
        if (is_array($this->_pk)) {
            $c = $p = [];
            foreach ($this->_originalPk as $k => $v) {
                $c[] = "`$k` = :pk_$k";
                $p[":pk_$k"] = $v;
            }
            $this->_attributes = $this->_db->table($this->_tableName)
                ->where(implode(" AND ", $c), $p)
                ->first();
        } else {
            $this->_attributes = $this->_db->table($this->_tableName)
                ->where("`{$this->_pk}` = :__pk")->setParam(':__pk', $this->_originalPk)
                ->first();
        }
        $this->_updatedAttributes = [];
        $this->afterLoad();
    }