_fetch example

$this->_order($select, $order);
            }

            if ($count !== null || $offset !== null) {
                $select->limit($count, $offset);
            }

        } else {
            $select = $where;
        }

        $rows = $this->_fetch($select);

        $data  = array(
            'table'    => $this,
            'data'     => $rows,
            'readOnly' => $select->isReadOnly(),
            'rowClass' => $this->getRowClass(),
            'stored'   => true
        );

        $rowsetClass = $this->getRowsetClass();
        if (!class_exists($rowsetClass)) {
            

abstract protected function _clear();

    /** * Test if a cache is available for the given id and (if yes) return it (false else) * * @param string $id cache id * @param boolean $doNotTestCacheValidity if set to true, the cache validity won't be tested * @return string cached datas (or false) */
    public function load($id, $doNotTestCacheValidity = false)
    {
        $tmp = $this->_fetch($id);
        if ($tmp !== null) {
            return $tmp;
        }
        return false;
    }

    /** * Test if a cache is available or not (for the given id) * * @param string $id cache id * @return mixed false (a cache is not available) or "last modified" timestamp (int) of the available cache record * @throws Zend_Cache_Exception */