mongodb.findDocument.java Source code

Introduction

Here is the source code for mongodb.findDocument.java

Source

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
//
//Retrieving Documents from MongoDB Using Java.

package mongodb;

import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.MongoClient;
import java.util.List;

/**
 *
 * @author soham
 */
public class findDocument {

    public static void main(String[] args) {
        try {
            MongoClient mongoClient = new MongoClient("localhost", 27017);
            DB db = mongoClient.getDB("words");
            DBCollection collection = db.getCollection("word_stats");
            findDocument.getOne(collection);
            findDocument.getManyWhile(collection);
            findDocument.getManyFor(collection);
            findDocument.getManyToArray(collection);
        } catch (Exception e) {
            System.out.println(e);
        }
    }

    public static void getOne(DBCollection collection) {
        DBObject doc = collection.findOne();
        System.out.println("Single Document: ");
        System.out.println(doc.toString());
    }

    public static void getManyWhile(DBCollection collection) {
        DBCursor cursor = collection.find();
        Double count = 0.0;
        while (cursor.hasNext()) {
            DBObject doc = cursor.next();
            count += Double.parseDouble(doc.get("size").toString());
        }
        System.out.println("\nTotal characters using While loop: ");
        System.out.println(count);
    }

    public static void getManyFor(DBCollection collection) {
        System.out.println("\nFor loop iteration: ");
        DBCursor cursor = collection.find();
        for (Integer i = 0; i < 5; i++) {
            DBObject doc = cursor.next();
            System.out.println(doc.get("word"));
        }
    }

    public static void getManyToArray(DBCollection collection) {
        System.out.println("\nConverted to array iteration: ");
        DBCursor cursor = collection.find();
        List<DBObject> docs = cursor.toArray(5);
        for (final DBObject doc : docs) {
            System.out.println(doc.get("word"));
        }
    }
}