Yii 中的更新查询

问题描述

我在 Yii 中有一个要求，我必须根据某些条件更新一张表.我必须用 new_val = previous_value + new_val 更新列.但是代码没有按预期工作.

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.

我试过的代码是

$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

有人知道错误在哪里吗?

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 将允许您发送一个表达式来更新列值.

Using CDbExpression will allow you to send an expression for what to update the column value to be.

参见:http://www.yiiframework.com/doc/api/1.1/CDbCommand#更新细节

和:http://www.yiiframework.com/doc/api/1.1/CDbExpression#__构造细节

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