Yii :: app（）-> db-> createCommand（）缓存查询结果？

Question

I'm new to Yii and I have a problem with Yii::app()->db->createCommand() that I run after inserting a row to table. I want to check how many rows I have in the table with params supplied, but Yii::app()->db->createCommand() returns 0 even if the row is inserted.

Here's the simplified code:

$photo_model    = new Photo();
$ehp_model      = new EventHasPhoto();

$photo_model->setIsNewRecord(true);
$photo_model->photo_id      = null;
$photo_model->original_id   = $data->id;

$photo_model->save();   

$ehp_model->setIsNewRecord(true);
$ehp_model->event_id    = $event_id;
$ehp_model->photo_id    = $photo_model->photo_id;
$ehp_model->is_approved = ($event_model->moderation == 1 ? -1 : 1);
$ehp_model->save(); 

$count  = Yii::app()->db->createCommand()->select('COUNT(p.photo_id) AS num')
    ->from('photo AS p')
    ->join('event_has_photo AS ehp','ehp.photo_id=p.photo_id')
    ->where('p.original_id="'.$data->id.'" AND ehp.event_id='.$event_id)
    ->queryAll();
$exist  = $count[0]["num"];  // exists is 0

Value of exists is 0, but when I run the same query through MySQL workbench I get 1, so I assume there's some built-in caching mechanism that's returning stale data.

Any thoughts?

Answer 1

Looks like a syntax error, with error reporting off.

If you don't pass true to queryAll, you will NOT get an associative array back; rather, you will get a result with integer index keys.

In other words, your $count variable contains:

$count = array(
    0=>array(0=>1)
)

With error_reporting( ) set to 0, $count[0]["num"] evaluates to false in this situation.

To solve, pass true to queryAll()

$count  = Yii::app()->db->createCommand()->select('COUNT(p.photo_id) AS num')
    ->from('photo AS p')
    ->join('event_has_photo AS ehp','ehp.photo_id=p.photo_id')
    ->where('p.original_id="'.$data->id.'" AND ehp.event_id='.$event_id)
    ->queryAll(true);
$exist  = $count[0]["num"];

Or use queryScalar()

$count  = Yii::app()->db->createCommand()->select('COUNT(p.photo_id) AS num')
    ->from('photo AS p')
    ->join('event_has_photo AS ehp','ehp.photo_id=p.photo_id')
    ->where('p.original_id="'.$data->id.'" AND ehp.event_id='.$event_id)
    ->queryScalar();
$exist  = $count;

Or even access the correct array element using your original query:

$count  = Yii::app()->db->createCommand()->select('COUNT(p.photo_id) AS num')
    ->from('photo AS p')
    ->join('event_has_photo AS ehp','ehp.photo_id=p.photo_id')
    ->where('p.original_id="'.$data->id.'" AND ehp.event_id='.$event_id)
    ->queryAll();
$exist  = $count[0][0];