Fetch And Store

i want to fetch a field in controller where id=$ad.

below is my code .

i am not able to get value in $command

	public function actionCreatecashform()


{


	$model=new Fees;








            if(isset($_POST['Fees']))


	{


		$model->attributes=$_POST['Fees'];


		if($model->save())


		{


			$ad= $model->admission_id;


			


		


			


$command = Yii::app()->db->createCommand('select status from preadmission where id='.$ad)->execute();


			


			if($command==0)


			{


				


				Yii::app()->db->createCommand('UPDATE preadmission set sc_id=5 where id='.$ad)->execute();


				//Preadmission::model()->updateAll(array( 'status' => 1 ), 'id =.$ad' );


				$this->redirect(array('viewfullcash','id'=>$model->id));


			}

}

}