mongodb.JavaDocSave.java Source code

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Here is the source code for mongodb.JavaDocSave.java

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/*
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 */
//Saving Documents in a Collection Using Java.
//To demonstrate modifying a document object and then saving it from Java Applications.

package mongodb;

/**
 *
 * @author soham
 */
import com.mongodb.MongoClient;
import com.mongodb.WriteConcern;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBObject;
import com.mongodb.BasicDBObject;
import com.mongodb.DBCursor;
import com.mongodb.WriteResult;

public class JavaDocSave {
    public static void main(String[] args) {
        try {
            MongoClient mongoClient = new MongoClient("localhost", 27017);
            mongoClient.setWriteConcern(WriteConcern.JOURNAL_SAFE);
            DB db = mongoClient.getDB("words");
            DBCollection collection = db.getCollection("word_stats");
            JavaDocSave.showWord(collection, "Before save");
            JavaDocSave.saveBlueDoc(collection);
            JavaDocSave.showWord(collection, "After save");
            JavaDocSave.resetDoc(collection);
            JavaDocSave.showWord(collection, "After reset");
        } catch (Exception e) {
            System.out.println(e);
        }
    }

    public static void saveBlueDoc(DBCollection collection) {
        BasicDBObject query = new BasicDBObject("word", "ocean");
        DBObject word = collection.findOne(query);
        word.put("category", "blue");
        WriteResult result = collection.save(word);
        System.out.println("Update Result: \n" + result.toString());
    }

    public static void resetDoc(DBCollection collection) {
        BasicDBObject query = new BasicDBObject("word", "ocean");
        DBObject word = collection.findOne(query);
        word.put("category", "");
        WriteResult result = collection.save(word);
        System.out.println("Update Result: \n" + result.toString());
    }

    public static void showWord(DBCollection collection, String msg) {
        System.out.println("\n" + msg + ": ");
        BasicDBObject query = new BasicDBObject("word", "ocean");
        BasicDBObject fields = new BasicDBObject("word", 1);
        fields.append("category", 1);
        DBObject doc = collection.findOne(query, fields);
        System.out.println(doc);
    }
}