How to query documents using "_id" field in Java mongodb driver?
Not sure if others might be searching for answers on this topic, but here is the easiest way to search for a MongoDB record based on "_id". The MongoDB documentation is not updated and still shows ObjectId as being part of the com.mongodb
package (it also generally does not give a lot of information on searching by ObjectId).
import org.bson.types.ObjectId;
public DBObject findDocumentById(String id) {
BasicDBObject query = new BasicDBObject();
query.put("_id", new ObjectId(id));
DBObject dbObj = collection.findOne(query);
return dbObj;
}
For those who are seeking a more up to date method, especially with 3.4:
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import org.bson.Document;
import org.bson.types.ObjectId;
import static com.mongodb.client.model.Filters.eq;
//......
MongoCollection<Document> myCollection = database.getCollection("myCollection");
Document document = myCollection.find(eq("_id", new ObjectId("4f693d40e4b04cde19f17205"))).first();
if (document == null) {
//Document does not exist
} else {
//We found the document
}