สอบถามการดึงข้อมูลใช้ CGridView Yii Framework ครับ

<?php 
class UserController extends Controller{
	function actionCGridView (){
		$sql = "SELECT * FROM tb_user";
		//$model = new User();
		$user = new CActiveDataProvider($sql);
		$this->render("CGridView",array(
			"user" => $user
		)
		);	
	}	
}
?>

<?php 
$this->widget('zii.widgets.grid.CGridView', array(
	'dataProvider' => $user,
	'columns' => array(                 // กำหนด column ที่จะแสดง
            'name' => 'id',
            'header' => 'ID',
        ),
        array(
            'name' => 'user',
            'header' => 'Username',
        ),
        array(
            'name' => 'pass',
            'header' => 'Password',)
));
?>