yii2框架sql取某字段和的问题

Question

yii2框架里面有没有sql的sum方法可以直接根据sql条件查询某个字段的总和？比如我要获取我的db_article_list文章表中type='isOpen'的commentNum字段和值！或者说如果自己写sql，如何通过框架执行自定义的sql呢！

Answer 1

还是执行自己写的sql方便，如下是执行自定义的sql的例子，你参看看看

$sql = "SELECT SUM(commentNum) AS num FROM db_article_list WHERE `type`='isOpen'";
$commentNum = Yii::$app->db->createCommand($sql)->queryOne();

Answer 2

改一下select就可以了

$model->find()->select(['num'=>'SUM(commentNum)'])->where(['type'=>'isOpen'])->one();

Answer 3

当然有sum方法！

1. Query

(new Query())->from('table')->sum('field');

1. AR

Article::find()->sum('field');

Answer 4

$countQuantity = OrderWsyReturnGoods::find()->where(['order_id' => $returnGoods->order_id, 'goods_sn' => $returnGoods->goods_sn,'status' => OrderWsyReturnGoods::STATUS_DONE])->sum('return_quantity');

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之前的一段代码，看着改变量就行了，我写了三个筛选条件。