Java driver equivalent for JavaScript shell's Object.bsonsize( doc )?

Question

I was wondering what the Java driver's equivalent to the Mongo JavaScript shell's Object.bsonsize( doc ) method? For example, what is the Java code to perform the following:

bobk-mbp:~ bobk$ mongo
MongoDB shell version: 2.0.4
connecting to: test
PRIMARY> use devices;
switched to db devices
PRIMARY> Object.bsonsize( db.profiles.findOne( { _id: "REK_0001" } ) );
186
PRIMARY> Object.bsonsize( db.profiles.findOne( { _id: "REK_0002" } ) );
218
PRIMARY>

How do I perform this same basic use case with the MongoDB Java Driver. Its not obvious through the JavaDocs.

jyemin · Accepted Answer · 2012-06-04 20:12:57Z

6

There's nothing quite as clean as what's available in the shell, but this will work:

DBObject obj = coll.findOne();
int bsonSize = DefaultDBEncoder.FACTORY.create().
        writeObject(new BasicOutputBuffer(), obj));

answered Jun 4, 2012 at 20:12

jyemin

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2 Comments

Bob Kuhar Over a year ago

Wow. That is long winded, and I can't resolve any DefaultDBEncoder in my IDE using Mongo 2.6.5 Java driver. Its also undesirable to have to write the document to figure out its size. My actual use case is I'm trying to enforce some size limits before I commit a document to the database. In any event, thanks for the reply and I'll see if I can get there from here.

Prakash Over a year ago

@jyemin Using mongodb shell using Object.bsonSize getting as 390 where as using above we are getting as 386. is there any possibility to get exact size of the mongodb document

Benedikt Waldvogel · Accepted Answer · 2013-02-20 14:14:56Z

3

You can use BasicBSONEncoder:

DBObject obj = coll.findOne();
int bsonSize = new BasicBSONEncoder().encode(obj).length;

edited Feb 20, 2013 at 14:14

answered Oct 8, 2012 at 13:44

Benedikt Waldvogel

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Comments

Volker Seibt · Accepted Answer · 2013-08-21 06:52:40Z

1

What about:

        CommandResult result = db.doEval("Object.bsonsize(db.profiles.findOne({ _id: "REK_0001" }))");
        double bsonSize = (Double) result.get("retval");

It's double instead of int.

doEval is part of the MongoDB Java Driver since the first version.

answered Aug 21, 2013 at 6:52

Volker Seibt

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