How to write java code using mongodb query builder to retrieve a document using "_id"?

Question

How to convert following query to java code using mongodb QueryBuilder?

db.event.find({"_id":ObjectId("55aff4883e688fbea60d0698")})

Sede · Accepted Answer · 2015-07-30 21:19:29Z

2

Try this:

DBObject query = QueryBuilder.start("_id").is(ObjectId("55aff4883e688fbea60d0698")).get();

edited Jul 30, 2015 at 21:19

Sede

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answered Jul 30, 2015 at 21:10

Tom Boldan

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1 Comment

ishanaba Over a year ago

Gives an Error "The method ObjectId(String) is undefined for the type QuerryTest"

sharmaap · Accepted Answer · 2015-07-30 21:10:41Z

0

//set up DB

//select the collection
DBCollection coll = db.getCollection("event");

//Retrieve
DBCursor cursor = coll.find(QueryBuilder.start().put("_id")
                    .is("55aff4883e688fbea60d0698").get());

while(cursor.hasNext()) {
    System.out.println(cursor.next());
}

Hope it works for you.

answered Jul 30, 2015 at 21:10

sharmaap

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3 Comments

sharmaap Over a year ago

What did you get in output? What version of mongodb and java are you using?

ishanaba Over a year ago

I got nothing as the output maybe due to "_id" type is ObjectId not a String. When I ask this question I was working with 2.0 and recently moved to 3.0 it seems more convenient with filters.

sharmaap Over a year ago

Okay, check that the object is in the DB. If you post your code, we could debug it faster.

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