Fatal error: Call to a member function MoveNext() on a non-object in D:\webserver\wwwRoot\show.php on line 31

相应的
[php]
$sql = "SELECT id,MusicName,SClassID,NClassID FROM " . TABLE_PREFIX ."musiclist WHERE SpecialID='$id'";
$rs = &$db->Execute($sql);
$musiclist = array();
while (!$rs->EOF) {
$musiclist[] = $rs->fields;
$SClassID = $rs->fields['SClassID'];
$NClassID = $rs->fields['NClassID'];
$rs->MoveNext();
}
$rs->Close();
unset($sql,$rs);[/php]
思考：用的是ADODB，开始没问题，当MYSQL数据库增大到一定时，这个情况就出现了，是否是MYSQL的问题，或者是我的环境配置问题，不知大家有没有碰到过，望探讨一二。