在Yii中返回CActiveDataProvider

Question

I have 4 database table:

User : id, username, password

Floor : id, userid, name

Room : id, floor, name

Student : id, room, name, active

How to return CActiveDataProvider for the follow SQL command?

SELECT * FROM `student` WHERE `student`.`active` = 0 AND `student`.`room` IN (SELECT `room`.`id` FROM `room` WHERE `room`.`floor` = (SELECT `floor`.`id` FROM `floor` WHERE `floor`.`userid` = $userid))

I tried:

$model = Student::model()->findAllBySql("SELECT * FROM student WHERE active = 0 AND room IN (SELECT id FROM room WHERE floor = (SELECT id FROM floor WHERE user = $user))");
return new CActiveDataProvider($model);

But response:

Fatal error: Call to a member function getDbCriteria() on a non-object in X:appserv\\www\\framework\\web\\CActiveDataProvider.php on line 225

Answer 1

Named placeholder is useful.

$criteria = new CDbCriteria;
$criteria->condition = 'student.active = 0 AND student.room IN (SELECT room.id FROM room WHERE room.floor = (SELECT floor.id FROM floor WHERE floor.userid = :userid))';
$criteria->params=array(':userid'=>$userid);
$dataProvider = new CActiveDataProvider('Student',array('criteria'=>$criteria,));