MDB2 nested queries problem

Hi every one, I have a problem with MDB2 when i want to use it inside loop, like below code. when reaches second query, it overrides result of the first query, so loop doesn't work properly anymore. for example if second query does empty, loop level one stops!. i searched the manual and also source code , but i couldn't find any way to solve it. i used different methods to connect like factory but didn't change anything. so would you please help me if you know what is wrong? <?php $queryResultLevel1 = &$storage->query('SELECT * FROM users'); while ($rowLevel1=$queryResultLevel1->fetchRow(MDB2_FETCHMODE_ASSOC)) { echo "Photos of user ".$rowLevel1['name']." : <br/>"; $queryResultLevel2 = &$storage->query('SELECT * FROM users_photos WHERE user_id='.$rowLevel1['id']); while ($rowLevel2=$queryResultLevel2->fetchRow(MDB2_FETCHMODE_ASSOC)) { echo "- ".$rowLevel2['filename']."<br/>"; } } ?>