php - Yii createCommand not not returning correct results -

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i trying random id table specific visiblity=2 clause having issues getting return id, says undefined index: id.

     $space = yii::app()->db->createcommand()          ->select('id')          ->from('space')          ->where('id=rand() , visibility=2')          ->limit(1)          ->queryall();          //->queryrow();      echo $space['id'];

is not correct way?

i figured out solution using loaded info original version without guest check.

    $max = space::model()->count();     $randid = rand(0,$max);     $space = space::model()->find(array('offset'=>$randid));     if ($space->attributes['visibility'] == 2) {

you can use order rand() instead of id = rand(). can use ->queryscalar() id directly.

$space = yii::app()->db->createcommand()      ->select('id')      ->from('space')      ->where('visibility = 2')      ->order('rand()')      ->limit(1)      ->queryscalar();   echo $space;

keep in mind rand() slow solution. check alternatives.
also, if no entries database, have check case:

if (!empty($space)) { // id never 0     // $space } else {     throw new chttpexception(404, 'no data found'); }

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