更新Yii中的查询 [英] Update query in Yii
问题描述
我在Yii
中有一项要求,我必须根据某种条件更新一张表.而且我必须用new_val = previous_value + new_val
更新该列.但是代码无法按预期运行.
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.
我尝试的代码是
$update = Yii::app()->db->createCommand()
->update('tbl_post', array('star'=>('star' + 1),'total'=>('total' + $ratingAjax)),
'id=:id',array(':id'=>$post_id));
在正常查询中,查询将是
In normal query the query will be
UPDATE tbl_post set star= star + 1,total = total + '$ratingAjax' where id = 1
有人知道哪里出了错吗?
Anybody knows where is mistake?
推荐答案
尝试以下操作:
$update = Yii::app()->db->createCommand()
->update('tbl_post',
array(
'star'=>new CDbExpression('star + 1'),
'total'=>new CDbExpression('total + :ratingAjax', array(':ratingAjax'=>$ratingAjax))
),
'id=:id',
array(':id'=>$post_id)
);
使用CDbExpression
将允许您发送表达式以表示要更新的列值.
Using CDbExpression
will allow you to send an expression for what to update the column value to be.
请参阅: http://www.yiiframework.com/doc/api/1.1/CDbCommand #update-detail
和: http://www.yiiframework.com/doc/api/1.1/CDbExpression# __ construct-detail
and: http://www.yiiframework.com/doc/api/1.1/CDbExpression#__construct-detail
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