使用MongoDB Java驱动程序更新嵌入式文档中的字段? [英] Updating fields in embedded documents with MongoDB Java Driver?

问题描述

我正在尝试使用Java驱动程序对MongoDB中的嵌入式文档进行更新，但收到一个IllegalArgumentException异常，该异常指出存储在db中的字段中不能包含."

I'm trying to perform an update on an embedded document in MongoDB with the Java driver but receive an IllegalArgumentException that states "fields stored in the db can't have . in them"

我的文档具有以下结构:

My document has the structure:

{
    "_id" : ObjectId("5155d102a47d7b00b7e4bed2"),
    "foo" : {
        "bar" : {
            "name" : "Now"
        }
    }
}

我想执行这样的更新

var query = {_id:ObjectId("5155d102a47d7b00b7e4bed2")};
var update = {"foo.bar.time":new Date()};
var withSet = {$set:update};
db.samples.update(query,withSet);

从控制台正确修改文档的

which from the console correctly modifies the document

{
    "_id" : ObjectId("5155d102a47d7b00b7e4bed2"),
    "foo" : {
        "bar" : {
            "name" : "Now",
            "time" : ISODate("2013-03-29T18:02:51.591Z")
        }
    }
}

尝试在Java中做同样的事情我没有成功.我已经尝试过了:

Trying to do the same in Java I have not been successful. I've tried this:

BasicDBObject query = new BasicDBObject("_id", new ObjectId("5155d102a47d7b00b7e4bed2"));

BasicDBObject time = new BasicDBObject("time", new Date());
BasicDBObject bar = new BasicDBObject("bar", time);
BasicDBObject foo = new BasicDBObject("foo", bar);
BasicDBObject withSet = new BasicDBObject("$set", foo);

samples.update(query, withSet);

但是它掩盖了嵌入的bar对象，破坏了名称.

But it clobbers the embedded bar object, destroying name.

我也尝试过:

BasicDBObject foo = new BasicDBObject();
foo.append("foo.bar.time", new Date());    
samples.update(query, foo)

但是会收到一个IllegalArgumentException.

But receive an IllegalArgumentException.

我看到了在Stack Overflow上选择的其他答案，其中包括该点符号.有什么我想念的吗?在嵌入式文档中更新字段的正确方法是什么?

I've seen other answers chosen on Stack Overflow that include this dot notation. Is there something I'm missing? What is the proper way to update a field in an embedded document?

推荐答案

在您的最后一个示例中，缺少了$set部分，这可能会导致问题.尝试

In your last example the $set part is missing, maybe this causes the problem. Try

samples.update(
  query,
  new BasicDBObject(
    "$set",
    new BasicDBObject("foo.bar.time", new Date())
));

相反.

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