CODEWITHSUNDEEP
javamongodbmongodb-java
coder
coder

Reputation: 1941

not able to insert documents into collection using mongodb java driver

I'm using mongo mongo java driver version 2.11.2. I want to insert some few documents into my dbin mongodb and when I try to do it from command line it all works fine. But when I use mongo java driver, it is not working. I'm using BasicDBObject to populate the document. But collection.insert(BasicDBObject).getN() gives me 0 always. Nothing is getting inserted into the collection. Am I missing something here?

Adding the code:

mongo = new MongoClient("localhost", 27017);
DB db = mongo.getDB("db");
DBCollection collection = db.getCollection("collection");
BasicDBObject o = new BasicDBObject();
o.put("key1", "value1");
o.put("key2", "value2");
collection.insert(o);

No update is made in DB after this.

Upvotes: 1

Views: 4520

Answers (1)

Rob Moore
Rob Moore

Reputation: 3383

The 'n' value from the getlasterror of an insert is always zero. (The 'n' value is what the WriteResult.getN() returns.)

See this MongoDB Jira ticket: https://jira.mongodb.org/browse/SERVER-4381. Which has been closed in preference to a new insert, update, remove mechanism: https://jira.mongodb.org/browse/SERVER-9038

Long story short. You are not mad or missing anything. It is a "feature" of MongoDB that will hopefully finally be fixed with the 2.6 release.

Rob.

Edit:

I modified your example slightly to print the saved document. Can you try running this version in your environment?

import java.net.UnknownHostException;

import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBObject;
import com.mongodb.MongoClient;
import com.mongodb.WriteConcern;

public class StackOverFlow {

    public static void main(String[] args) throws UnknownHostException {
        MongoClient mongo = new MongoClient("localhost:27017");
        DB db = mongo.getDB("db");
        DBCollection collection = db.getCollection("collection");
        BasicDBObject o = new BasicDBObject();
        o.put("key1", "value1");
        o.put("key2", "value2");
        collection.insert(WriteConcern.SAFE, o);

        for (DBObject doc : collection.find()) {
            System.out.println(doc);
        }
    }
}

On my machine it outputs:

{ "_id" : { "$oid" : "5235f98495302901eb70e7a4"} , "key1" : "value1" , "key2" : "value2"}

Upvotes: 2

Related Questions