php - Yii:如何使用 CDbCriteria 在 GROUP BY 之前进行 ORDER BY？

Question

像这样的查询:

SELECT * FROM (
    SELECT * FROM message ORDER BY added_on DESC
) as m WHERE receiver_id = 2 GROUP BY sender_id ORDER BY priority_id DESC;

我知道如何使用 findAllBySql 来做到这一点:

$this->findAllBySql(
    'SELECT * FROM (
        SELECT * FROM message ORDER BY added_on DESC
     ) as m WHERE receiver_id = :receiverId 
     GROUP BY sender_id 
     ORDER BY priority_id DESC', 
     array('receiverId' => $userId));

但我想知道是否有任何方法可以使用 CDbCriteria 来做到这一点导致以下代码当然不起作用:

$criteria = new CDbCriteria();
$criteria->condition = 'receiver_id = :receiverId';
$criteria->group = 'sender_id';
$criteria->order = 'priority_id DESC, added_on DESC';
$criteria->params = array('receiverId' => $userId);

谢谢。

Answer 1

我知道为时已晚。我有类似的问题，我尝试这样处理

$criteria = new CDbCriteria();
$criteria->select = '*, MAX(added_on) max_added_on';
$criteria->condition = 'receiver_id = :receiverId';
$criteria->group = 'sender_id';
$criteria->order = 'priority_id DESC, max_added_on DESC';
$criteria->params = array('receiverId' => $userId);

它解决了我的问题。如果你想检索 max_added_on，你只需要在模型类上添加另一个属性。