Abstract: Java -MongoDB Add DBRef
mongo = this.dao.getMongo (); Mongo // take the object, self-writing
db = this.dao.getDB (mongo); // DB acquired object itself written
DBCollection collection = db.getCollection (this.collection_name);
obj.append ( "ref_field", new new DBRef (DB, "ref_collection_name", obj.getString ( "ref_field_id")));
collection.save (obj)
Original: Big Box Java -MongoDB Add DBRef