public function find($primaryKey)
    {
        $where = array(
            $this->_primary => $primaryKey
        );

        $qp = $this->_fetch($where);
        $row = $this->_fetchRow($qp['query'], $qp['params']);
        $className = $this->_rowClass;
        $class = new $className($this);

        if (!$row) {
            return false;
        }

        $class->setData($row);

        return $class;
    }