How to update a document in MongoDB using ObjectID in Java

问题

What I am trying to accomplish here is pretty simple. I am trying to update a single document in MongoDB collection. When I look up the document using any field, such as "name", the update query succeeds. Here is the query:

mongoDB.getCollection("restaurants").updateOne(
    new BasicDBObject("name", "Morris Park Bake Shop"),
    new BasicDBObject("$set", new BasicDBObject("zipcode", "10462"))
);

If I try to lookup the document with the ObjectId, it never works as it doesn't match any document.

mongoDB.getCollection("restaurants").updateOne(
    new BasicDBObject("_id", "56110fe1f882142d842b2a63"),
    new BasicDBObject("$set", new BasicDBObject("zipcode", "10462"))
);

Is it possible to make this query work with Object IDs?

I agree that my question is a bit similar to How to query documents using "_id" field in Java mongodb driver? however I am not getting any errors while trying to update a document. It just doesn't match anything.

回答1:

You're currently trying to update based on a string, not an ObjectId.

Make sure to initialise a new ObjectId from the string when building your query:

mongoDB.getCollection("restaurants").updateOne(
    new BasicDBObject("_id", new ObjectId("56110fe1f882142d842b2a63")),
    new BasicDBObject("$set", new BasicDBObject("zipcode", "10462"))
);

回答2:

@sheilak's answer is the best one but,

You could use {"_id", {"$oid","56110fe1f882142d842b2a63"}} as the filter for the update query if you want it to be in the string format

回答3:

Convert the string to objectid:

from bson.objectid import ObjectId
db.collection.find_one({"_id":ObjectId('5a61bfadef860e4bf266edb2')})

{u'_id': ObjectId('5a61bfadef860e4bf266edb2'), ...

来源：https://stackoverflow.com/questions/32933344/how-to-update-a-document-in-mongodb-using-objectid-in-java

标签

java

mongodb

mongodb-query