求助！ [ 新手入门 ]

我就只想知道

SELECT *,COUNT(*) AS nums FROM log GROUP BY `cid`;

这样的语句怎么处理，都没有人知道吗？

$criteria = new CDbCriteria();
$criteria->group = "bot";
$criteria->select = "*, COUNT(`cid`)  AS nums";
$criteria->params = "";
$test = Log::model()->findAll($criteria);    
foreach ($test as $value) {
    echo '<pre>';
    print_r($value->nums);
    echo '</pre>';
}

sql正常，但总提示nums未定义。