Getting specific data from database - yii

Question

I have a table called Category with a few columns and I'm trying to get only a few out of my database.
So I've tried this:
$sql = 'SELECT uppercat AS id, COUNT(uppercat) AS uppercat FROM category GROUP BY uppercat;';
$d = Yii::app()->db->createCommand($sql)->query();
But I find the output strange. I was trying to do an array_shift but I get an error that this isn't an array. When I do a var_dump on $d:
object(CDbDataReader)[38]
private '_statement' =>
object(PDOStatement)[37]
public 'queryString' => string 'SELECT uppercat AS id, COUNT(uppercat) AS uppercat FROM category GROUP BY uppercat;' (length=100)
private '_closed' => boolean false
private '_row' => null
private '_index' => int -1
private '_e' (CComponent) => null
private '_m' (CComponent) => null
Ok.. then I did a foreach on $id:
array
'id' => string '0' (length=1)
'uppercat' => string '6' (length=1)
array
'id' => string '3' (length=1)
'uppercat' => string '2' (length=1)
array
'id' => string '6' (length=1)
'uppercat' => string '1' (length=1)
array
'id' => string '7' (length=1)
'uppercat' => string '2' (length=1)
array
'id' => string '9' (length=1)
'uppercat' => string '2' (length=1)
Then why do I get the message that $id isn't an array while it contains arrays?
Is there any other way on how to get some specific data out of my database and that I can then do an array_shift on them? I've also tried doing this with findAllBySql but then I can't reach my attribute for COUNT(uppercat) which is not in my model. I guess I'd have to add it to my model but I wouldn't like that because I need it just once.

Answer 1

CDbCommand's query returns a CDbDataReader object for fetching the query result. Use queryAll instead, that returns an array of rows.
However, it is nicer if you do it with CDbCriteria (you need a model property for that, you're right).
It would look something like this, assuming the property is called countUppercat.
$criteria = new CDbCriteria;
$criteria->select = 'uppercat, COUNT(uppercat) AS countUppercat';
$criteria->group = 'countUppercat';
$models = CategorieModel::model()->findAll($criteria);

Answer 2

Try this.. its closed which you approched used...
$sql = 'SELECT uppercat AS id, COUNT(uppercat) AS uppercat FROM categorie GROUP BY uppercat;';
$d = Yii::app()->db->createCommand($sql)->queryAll();
and after that when you want to see your array so use,
print_r($d);
so you get the array..
it will work for you..