mongodb.JavaDocUpdate.java Source code

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Here is the source code for mongodb.JavaDocUpdate.java

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/*
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//Updating Documents in a Collection Using Java.

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 JavaDocUpdate {
    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");
            JavaDocUpdate.showWord(collection, "Before update");
            JavaDocUpdate.updateDoc(collection);
            JavaDocUpdate.showWord(collection, "After update");
            JavaDocUpdate.resetDoc(collection);
            JavaDocUpdate.showWord(collection, "After reset");
        } catch (Exception e) {
            System.out.println(e);
        }
    }

    public static void updateDoc(DBCollection collection) {
        BasicDBObject query = new BasicDBObject("word", "left");
        BasicDBObject update = new BasicDBObject();
        update.append("$set", new BasicDBObject("word", "lefty"));
        BasicDBObject inc = new BasicDBObject("size", 1);
        inc.append("stats.consonants", 1);
        update.append("$inc", inc);
        update.append("$push", new BasicDBObject("letters", "y"));
        WriteResult result = collection.update(query, update, false, false);
        System.out.println("Update Result: \n" + result.toString());
    }

    public static void resetDoc(DBCollection collection) {
        BasicDBObject query = new BasicDBObject("word", "lefty");
        BasicDBObject update = new BasicDBObject();
        update.append("$set", new BasicDBObject("word", "left"));
        BasicDBObject inc = new BasicDBObject("size", -1);
        inc.append("stats.consonants", -1);
        update.append("$inc", inc);
        update.append("$pop", new BasicDBObject("letters", 1));
        WriteResult result = collection.update(query, update, false, false);
        System.out.println("Reset Result: \n" + result.toString());
    }

    public static void showWord(DBCollection collection, String msg) {
        System.out.println("\n" + msg + ": ");
        BasicDBObject query = new BasicDBObject("word", new BasicDBObject("$in", new String[] { "left", "lefty" }));
        DBCursor cursor = collection.find(query);
        while (cursor.hasNext()) {
            DBObject doc = cursor.next();
            System.out.println(doc);
        }
    }
}