在文档中插入文档
我使用 mongodb + java。我尝试将新文档插入到现有文档中。假设我有一个集合“Users”：
{"_id" :{"$oid" : "4dc9..."}, "name" :"Klaus", "gender" :"unknown", "adress" :"null"}
现在我想更新此文档，其中名称 == Klaus 并向键 adress 添加一个新文档（现在只有“null”）。所以我想要这样的东西：
{"_id" :{"$oid" : "4dc9..."}, "name" :"Klaus", "gender" :"unknown", "adress" :{"country" :"Austria", "city": "..."}}
How to do it in Java？我尝试过
//DBCollection col "Users"
String json = "{'country': '" + user.country + "', 'city': '" + user.city + "'}";
DBObject dbObject = (DBObject)JSON.parse(json);
col.update(new BasicDBObject().append("name", "Klaus"), dbObject); //not working
，没有收到任何错误消息，新文档不存在。我的json有问题吗？或者我是否需要另一个“更新”功能，也许是替换（将 adress:null 替换为 adress:new document）？感谢您的帮助！
Im using mongodb + java. I tried to insert a new document into an existing document. Lets say I have a collection "Users":
{"_id" :{"$oid" : "4dc9..."}, "name" :"Klaus", "gender" :"unknown", "adress" :"null"}
Now I would like to update this document where the name == Klaus and add a new document to the key adress (wheres now only "null"). So I would like to have something like this:
{"_id" :{"$oid" : "4dc9..."}, "name" :"Klaus", "gender" :"unknown", "adress" :{"country" :"Austria", "city": "..."}}
How to do it in Java? I tried
//DBCollection col "Users"
String json = "{'country': '" + user.country + "', 'city': '" + user.city + "'}";
DBObject dbObject = (DBObject)JSON.parse(json);
col.update(new BasicDBObject().append("name", "Klaus"), dbObject); //not working
I dont get any errormessage, the new document is just not there. Is something wrong with my json? Or do I need another "update" function, maybe a replace (replace adress:null with adress:new document)? Thanks for any help!
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看看你的更新。您甚至没有指定应该有一个“地址”字段。另请注意，您并不是在此处的文档中“插入”文档。相反，您将顶级文档的字段设置为嵌入文档的值。使用这个代替：
Look at your update. At no point do you even specify there should be a field "address". Also note that you're not "inserting" a document within a document here. Rather your setting a field of your top level document to a value that is an embedded document. Use this instead :