在Yii中返回CActiveDataProvider

Question

我有4个数据库表：

用户：ID，用户名，密码

发言：id，userid，name

会议室：id，floor，name

学生：id，room，name，active

如何为以下SQL命令返回CActiveDataProvider？

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))

我试过了：

$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);

但回应：

  

致命错误：在第25行的X：appserv \ www \ framework \ web \ CActiveDataProvider.php中的非对象上调用成员函数getDbCriteria（）

Answer 1

命名占位符非常有用。

$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,));