Yii model的待条件和排序查询

$criteria=new CDbCriteria;

$criteria->addCondition("id=:id", "and");

$criteria->params[‘:id‘]=$_POST[‘book_id‘];

$criteria->order = "remove_time desc";

$comments = BooksComments::model()->findAllByAttributes(

array(‘book_id‘=>$_REQUEST["bkid"]),

$criteria

);

$readhistory = BooksHistory::model()->findAllByAttributes(

array(‘book_id‘=>$_REQUEST["bkid"]),

new CDbCriteria(array("order"=>"borrow_time desc"))

);