I have one requirement in Yii
where I have to update one table based on some condition. And I have to update the column with new_val = previous_value + new_val
. But the code is not working as expected.
The code I tried is
$update = Yii::app()->db->createCommand()
->update('tbl_post', array('star'=>('star' + 1),'total'=>('total' + $ratingAjax)),
'id=:id',array(':id'=>$post_id));
In normal query the query will be
UPDATE tbl_post set star= star + 1,total = total + '$ratingAjax' where id = 1
Anybody knows where is mistake?
Try the following:
$update = Yii::app()->db->createCommand()
->update('tbl_post',
array(
'star'=>new CDbExpression('star + 1'),
'total'=>new CDbExpression('total + :ratingAjax', array(':ratingAjax'=>$ratingAjax))
),
'id=:id',
array(':id'=>$post_id)
);
Using CDbExpression
will allow you to send an expression for what to update the column value to be.
See: http://www.yiiframework.com/doc/api/1.1/CDbCommand#update-detail
and: http://www.yiiframework.com/doc/api/1.1/CDbExpression#__construct-detail
Your working with strings, try this :
$update = Yii::app()->db->createCommand()
->update('tbl_post', array('star'=>'star + 1','total'=> 'total + '.$ratingAjax),
'id=:id',array(':id'=>$post_id));
This should do the job:
Post::model()->updateCounters(
array('star'=>1),
array('total'=>$ratingAjax),
array('condition' => "id = :id"),
array(':id' => $post_id),
);
It will increment, not set the values
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