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Mongo 更新现有数据,重新利用数据集领域
原标题:Mongo Updating current data, reusing fields in dataset

我的数据集在非行完成;然而,我想就文件编造一个新领域。 我想要利用我的一些投入以及目前数据库的其他领域:

IE:

Document: 
{ 
   "_id":myId,
   "city":"fooville",
   "state":"bar"
}

接着,我想通过每一个入境点来抓紧,并补充如下内容:

Document:
{
   "_id":myId,
   "city":"fooville",
   "state":"bar",
   "cityState":"fooville, bar"
}

这样做是否容易? 努力避免重报整个数据集。

事先感谢你的帮助

(Mongo is awesome)

最佳回答

与此类似:

$results = $collection->find();

// iterate through the results
foreach ($results as $results) 
{

    $collection->update(array("_id" => new MongoId($result[ _id ])), 
                        array( $set  => array("cityState" => sprintf("%s, %s", $result[ city ], $result[ state ]))));

}

. .

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