通过“合并”进行 MongoDB 原子更新文档

发布于 2024-11-06 07:12:21 字数 677 浏览 0 评论 0原文

我知道我可以通过设置特定字段来自动更新现有的 Mongo 文档。以下代码可以做到这一点：

var update = MongoDB.Driver.Builders.Update.Set("InsideLegMeasurement", 32.4);
SafeModeResult result = personCollection.Update(query, update, UpdateFlags.Multi,SafeMode.True);

但是，我可以通过传入要与现有文档“合并”的文档来自动更新多个字段吗？想象一下我有一个如下的文档： {"favcolor":"red","favfood":"pasta"} 我想用这些值更新现有文档。我想这样做：

var update = MongoDB.Driver.Builders.Update.Merge({"favcolor":"red","favfood":"pasta"});

或者甚至

var update = MongoDB.Driver.Builders.Update.Merge(myUpdateBsonDoc);

在 myBsonDocument 包含很多字段的情况下，我不想从要与原始文档合并的文档中“解压”这些字段。

这有可能吗？

谢谢

原文

I know that I can atomically update an existing Mongo document by setting specific fields. The following code will do it:

var update = MongoDB.Driver.Builders.Update.Set("InsideLegMeasurement", 32.4);
SafeModeResult result = personCollection.Update(query, update, UpdateFlags.Multi,SafeMode.True);

However, can I atomically update several fields by passing in a document that I want to 'merge' with the existing doc? Imagine I have a document as follows:
{"favcolor":"red","favfood":"pasta"} and I want to update an existing doc with these values. I want to do this:

var update = MongoDB.Driver.Builders.Update.Merge({"favcolor":"red","favfood":"pasta"});

or even

var update = MongoDB.Driver.Builders.Update.Merge(myUpdateBsonDoc);

where myBsonDocument contains lots of fields which I don't want to have to 'unpack' from the doc that is to be merged with the original.

Is this possible somehow?

Thanks

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凉城凉梦凉人心 2024-11-13 07:12:21

找到答案：

//var snippetJSON= '{title:"Tin Machine II",brandnewfield:"this gets added nicely"}';
    MongoDB.Bson.BsonDocument updateDoc = MongoDB.Bson.Serialization.BsonSerializer.Deserialize<BsonDocument>(snippetJSON);
var update = new UpdateDocument { { "$set", updateDoc } };

只要你知道怎么做就很容易！

Found the answer:

//var snippetJSON= '{title:"Tin Machine II",brandnewfield:"this gets added nicely"}';
    MongoDB.Bson.BsonDocument updateDoc = MongoDB.Bson.Serialization.BsonSerializer.Deserialize<BsonDocument>(snippetJSON);
var update = new UpdateDocument { { "$set", updateDoc } };

Easy when you know how!

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