Example usage for com.mongodb.client MongoCursor hasNext

Introduction

In this page you can find the example usage for com.mongodb.client MongoCursor hasNext.

Prototype

@Override
    boolean hasNext();

Source Link

Usage

From source file:it.terrinoni.Controller.java

public static void main(String[] args) {
    MongoClient client = new MongoClient();
    MongoDatabase database = client.getDatabase("photo-sharing");

    MongoCollection<Document> albums = database.getCollection("albums");
    MongoCollection<Document> images = database.getCollection("images");

    albums.createIndex(new Document("images", 1));

    // Get the iterator of the whole collection
    MongoCursor<Document> cursor = images.find().iterator();

    try {// w  w w .ja va  2  s . co  m
        while (cursor.hasNext()) {
            Document currImg = cursor.next();
            Document foundImg = albums.find(eq("images", currImg.getDouble("_id"))).first();
            if (foundImg == null) {
                //System.out.println(currImg.getDouble("_id") + " deleted.");
                images.deleteOne(currImg);
            }
            //System.out.println(currImg.getDouble("_id") + " is ok.");
        }
    } finally {
        cursor.close();
    }

    long numImgs = images.count(eq("tags", "sunrises"));
    System.out.println("The total number of images with the tag \"sunrises\" after the removal of orphans is: "
            + String.valueOf(numImgs));
}

---

From source file:it.terrinoni.hw2.Homework.java

public static void main(String[] args) {
    MongoClient client = new MongoClient();
    MongoDatabase database = client.getDatabase("students");
    MongoCollection<Document> collection = database.getCollection("grades");

    Bson filter = eq("type", "homework");
    Bson sort = ascending(asList("student_id", "score"));

    MongoCursor<Document> cursor = collection.find(filter).sort(sort).iterator();

    double last_student_id = -1;

    try {// w  ww.j ava 2  s. c om
        while (cursor.hasNext()) {
            Document doc = cursor.next();
            if (doc.getDouble("student_id") != last_student_id) {
                last_student_id = doc.getDouble("student_id");
                collection.deleteOne(doc);
                System.out.println("Document for " + last_student_id + " with score "
                        + String.valueOf(doc.getDouble("score")) + "  eliminated");
            }
            Helpers.printJson(doc);
        }
    } finally {
        cursor.close();
    }

}

---

From source file:it.terrinoni.hw3.PruneHomeworks.java

public static void main(String[] args) {
    // MongoDB connection
    MongoClient client = new MongoClient();
    MongoDatabase database = client.getDatabase("school");
    MongoCollection<Document> collection = database.getCollection("students");

    // Get the cursor to the collection
    MongoCursor<Document> cursor = collection.find().iterator();

    try {/*  w  w w  .  j  a va2s .  c o  m*/
        while (cursor.hasNext()) { // iteare over all the students
            double minScore = Double.MAX_VALUE; // set the maximum value
            Document minDoc = null; // temporary minimum
            Document student = cursor.next(); // current score

            // Retrieve the scores array
            List<Document> scores = student.get("scores", ArrayList.class);
            for (Document score : scores) { // iterate over the scores
                if (score.get("type", String.class).equals("homework")) { // get only the homeworks
                    System.out.println("Student " + student.getDouble("_id") + " has homework score equals to "
                            + score.getDouble("score"));
                    // Update the minimum score 
                    if (score.getDouble("score") < minScore) {
                        minScore = score.getDouble("score");
                        minDoc = score;
                    }
                }
            }
            // Remove the minimum score
            scores.remove(minDoc);

            // Update the student document
            Bson filter = eq("_id", student.getDouble("_id"));
            Document update = new Document("$set", new Document("scores", scores));
            collection.updateOne(filter, update);
        }
    } finally {
        cursor.close(); // close the cursos
    }
}

---

From source file:joliex.mongodb.MongoDbConnector.java

@RequestResponse
public Value listCollection() {
    Value v = Value.create();//from  ww w .j  ava 2s . c o  m
    MongoIterable<String> listCollectionNames = db.listCollectionNames();
    MongoCursor<String> iteratorListCollectionNames = listCollectionNames.iterator();
    int counterCollection = 0;
    while (iteratorListCollectionNames.hasNext()) {
        String collection = iteratorListCollectionNames.next();
        v.getChildren("collection").get(counterCollection).add(Value.create(collection));
        counterCollection++;
    }
    return v;
}

---

From source file:joliex.mongodb.MongoDbConnector.java

@RequestResponse
public Value listDB() {
    Value v = Value.create();/*w ww  .  ja va 2s  . c  o  m*/
    MongoIterable<String> databaseNames = mongoClient.listDatabaseNames();
    MongoCursor<String> databaseNamesIterator = databaseNames.iterator();
    int counterDatabase = 0;
    while (databaseNamesIterator.hasNext()) {
        v.getChildren("db").get(counterDatabase).add(Value.create(databaseNamesIterator.next()));
        counterDatabase++;
    }
    return v;
}

---

From source file:mongodb.QuickTour.java

License:Apache License

/**
 * Run this main method to see the output of this quick example.
 *
 * @param args takes an optional single argument for the connection string
 *///from  www.  j  a  va  2 s. c  o m
public static void main(final String[] args) {

    //represents a pool of connections to the database
    MongoClient mongoClient = new MongoClient("10.9.17.105", 27017);

    // get handle to "mydb" database
    MongoDatabase database = mongoClient.getDatabase("test");

    // get a handle to the "test" collection
    MongoCollection<Document> collection = database.getCollection("test");

    // drop all the data in it
    collection.drop();

    // make a document and insert it
    Document doc = new Document("name", "MongoDB").append("type", "database").append("count", 1).append("info",
            new Document("x", 203).append("y", 102));

    collection.insertOne(doc);

    // get it (since it's the only one in there since we dropped the rest earlier on)
    Document myDoc = collection.find().first();
    System.out.println(myDoc.toJson());

    // now, lets add lots of little documents to the collection so we can explore queries and cursors
    List<Document> documents = new ArrayList<Document>();
    for (int i = 0; i < 100; i++) {
        documents.add(new Document("i", i));
    }
    collection.insertMany(documents);
    System.out.println(
            "total # of documents after inserting 100 small ones (should be 101) " + collection.count());

    // find first
    myDoc = collection.find().first();
    System.out.println(myDoc.toJson());

    // lets get all the documents in the collection and print them out
    MongoCursor<Document> cursor = collection.find().iterator();
    try {
        while (cursor.hasNext()) {
            System.out.println(cursor.next().toJson());
        }
    } finally {
        cursor.close();
    }

    for (Document cur : collection.find()) {
        System.out.println(cur.toJson());
    }

    // now use a query to get 1 document out
    myDoc = collection.find(eq("i", 71)).first();
    System.out.println(myDoc.toJson());

    // now use a range query to get a larger subset
    cursor = collection.find(gt("i", 50)).iterator();

    try {
        while (cursor.hasNext()) {
            System.out.println(cursor.next().toJson());
        }
    } finally {
        cursor.close();
    }

    // range query with multiple constraints
    cursor = collection.find(and(gt("i", 50), lte("i", 100))).iterator();

    try {
        while (cursor.hasNext()) {
            System.out.println(cursor.next().toJson());
        }
    } finally {
        cursor.close();
    }

    // Query Filters
    myDoc = collection.find(eq("i", 71)).first();
    System.out.println(myDoc.toJson());

    // now use a range query to get a larger subset
    Block<Document> printBlock = new Block<Document>() {
        @Override
        public void apply(final Document document) {
            System.out.println(document.toJson());
        }
    };
    collection.find(gt("i", 50)).forEach(printBlock);

    // filter where; 50 < i <= 100
    collection.find(and(gt("i", 50), lte("i", 100))).forEach(printBlock);

    // Sorting
    myDoc = collection.find(exists("i")).sort(descending("i")).first();
    System.out.println(myDoc.toJson());

    // Projection
    myDoc = collection.find().projection(excludeId()).first();
    System.out.println(myDoc.toJson());

    // Update One
    collection.updateOne(eq("i", 10), new Document("$set", new Document("i", 110)));

    // Update Many
    UpdateResult updateResult = collection.updateMany(lt("i", 100),
            new Document("$inc", new Document("i", 100)));
    System.out.println(updateResult.getModifiedCount());

    // Delete One
    collection.deleteOne(eq("i", 110));

    // Delete Many
    DeleteResult deleteResult = collection.deleteMany(gte("i", 100));
    System.out.println(deleteResult.getDeletedCount());

    collection.drop();

    // ordered bulk writes
    List<WriteModel<Document>> writes = new ArrayList<WriteModel<Document>>();
    writes.add(new InsertOneModel<Document>(new Document("_id", 4)));
    writes.add(new InsertOneModel<Document>(new Document("_id", 5)));
    writes.add(new InsertOneModel<Document>(new Document("_id", 6)));
    writes.add(
            new UpdateOneModel<Document>(new Document("_id", 1), new Document("$set", new Document("x", 2))));
    writes.add(new DeleteOneModel<Document>(new Document("_id", 2)));
    writes.add(new ReplaceOneModel<Document>(new Document("_id", 3), new Document("_id", 3).append("x", 4)));

    collection.bulkWrite(writes);

    collection.drop();

    collection.bulkWrite(writes, new BulkWriteOptions().ordered(false));
    collection.find().forEach(printBlock);

    // Clean up
    //        database.drop();

    // release resources
    mongoClient.close();
}

---

From source file:mongoSample.MongoSample.java

License:Apache License

/**
 * Run this main method to see the output of this quick example.
 *
 * @param args//w  ww.ja  va2  s.  co m
 *            takes an optional single argument for the connection string
 */
public static void main(final String[] args) {
    String mongoServer = args[0];

    MongoClient mongoClient = new MongoClient(mongoServer);
    MongoDatabase database = mongoClient.getDatabase("sakila");
    MongoCollection<Document> collection = database.getCollection("test");

    // drop all the data in it
    collection.drop();

    // make a document and insert it
    Document doc = new Document("name", "MongoDB").append("type", "database").append("count", 1).append("info",
            new Document("x", 203).append("y", 102));

    collection.insertOne(doc);

    // get it (since it's the only one in there since we dropped the rest
    // earlier on)
    Document myDoc = collection.find().first();
    System.out.println(myDoc.toJson());

    // now, lets add lots of little documents to the collection so we can
    // explore queries and cursors
    List<Document> documents = new ArrayList<Document>();
    for (int i = 0; i < 100; i++) {
        documents.add(new Document("i", i));
    }
    collection.insertMany(documents);
    System.out.println(
            "total # of documents after inserting 100 small ones (should be 101) " + collection.count());

    // find first
    myDoc = collection.find().first();
    System.out.println(myDoc);
    System.out.println(myDoc.toJson());

    // lets get all the documents in the collection and print them out
    MongoCursor<Document> cursor = collection.find().iterator();
    try {
        while (cursor.hasNext()) {
            System.out.println(cursor.next().toJson());
        }
    } finally {
        cursor.close();
    }

    for (Document cur : collection.find()) {
        System.out.println(cur.toJson());
    }

    // now use a query to get 1 document out
    myDoc = collection.find(eq("i", 71)).first();
    System.out.println(myDoc.toJson());

    // now use a range query to get a larger subset
    cursor = collection.find(gt("i", 50)).iterator();

    try {
        while (cursor.hasNext()) {
            System.out.println(cursor.next().toJson());
        }
    } finally {
        cursor.close();
    }

    // range query with multiple constraints
    cursor = collection.find(and(gt("i", 50), lte("i", 100))).iterator();

    try {
        while (cursor.hasNext()) {
            System.out.println(cursor.next().toJson());
        }
    } finally {
        cursor.close();
    }

    // Query Filters
    myDoc = collection.find(eq("i", 71)).first();
    System.out.println(myDoc.toJson());

    // now use a range query to get a larger subset
    Block<Document> printBlock = new Block<Document>() {
        @Override
        public void apply(final Document document) {
            System.out.println(document.toJson());
        }
    };
    collection.find(gt("i", 50)).forEach(printBlock);

    // filter where; 50 < i <= 100
    collection.find(and(gt("i", 50), lte("i", 100))).forEach(printBlock);

    // Sorting
    myDoc = collection.find(exists("i")).sort(descending("i")).first();
    System.out.println(myDoc.toJson());

    // Projection
    myDoc = collection.find().projection(excludeId()).first();
    System.out.println(myDoc.toJson());

    // Update One
    collection.updateOne(eq("i", 10), new Document("$set", new Document("i", 110)));

    // Update Many
    UpdateResult updateResult = collection.updateMany(lt("i", 100),
            new Document("$inc", new Document("i", 100)));
    System.out.println(updateResult.getModifiedCount());

    // Delete One
    collection.deleteOne(eq("i", 110));

    // Delete Many
    DeleteResult deleteResult = collection.deleteMany(gte("i", 100));
    System.out.println(deleteResult.getDeletedCount());

    collection.drop();

    // ordered bulk writes
    List<WriteModel<Document>> writes = new ArrayList<WriteModel<Document>>();
    writes.add(new InsertOneModel<Document>(new Document("_id", 4)));
    writes.add(new InsertOneModel<Document>(new Document("_id", 5)));
    writes.add(new InsertOneModel<Document>(new Document("_id", 6)));
    writes.add(
            new UpdateOneModel<Document>(new Document("_id", 1), new Document("$set", new Document("x", 2))));
    writes.add(new DeleteOneModel<Document>(new Document("_id", 2)));
    writes.add(new ReplaceOneModel<Document>(new Document("_id", 3), new Document("_id", 3).append("x", 4)));

    collection.bulkWrite(writes);

    collection.drop();

    collection.bulkWrite(writes, new BulkWriteOptions().ordered(false));
    // collection.find().forEach(printBlock);

    // Clean up
    //database.drop();

    // release resources
    mongoClient.close();
}

---

From source file:mongoSample.MyMongoDemo.java

License:Apache License

public static void main(final String[] args) {
    String mongoServer = args[0];

    MongoClient mongoClient = new MongoClient(mongoServer);
    MongoDatabase database = mongoClient.getDatabase("NGDBDemo");
    MongoCollection<Document> collection = database.getCollection("test");

    collection.drop();//w w  w.  j a  v  a 2s .c  om

    Document people = new Document(); // A document for a person
    people.put("Name", "Guy");
    people.put("Email", "guy@gmail.com");

    BasicDBList friendList = new BasicDBList(); // A list for the persons
    // friends

    BasicDBObject friendDoc = new BasicDBObject(); // A document for each
    // friend

    friendDoc.put("Name", "Jo");
    friendDoc.put("Email", "Jo@gmail.com");
    friendList.add(friendDoc);
    friendDoc.clear();
    friendDoc.put("Name", "John");
    friendDoc.put("Email", "john@gmail.com");
    friendList.add(friendDoc);
    people.put("Friends", friendDoc);

    collection.insertOne(people);

    System.out.println('1');
    MongoCursor<Document> cursor = collection.find().iterator();
    try {
        while (cursor.hasNext()) {
            System.out.println(cursor.next().toJson());
        }
    } finally {
        cursor.close();
    }
    System.out.println('2');

    for (Document cur : collection.find()) {
        System.out.println(cur.toJson());
    }

    System.out.println('3');
    // now use a query to get 1 document out
    Document myDoc = collection.find(eq("Name", "Guy")).first();
    System.out.println(myDoc.toJson());

    database = mongoClient.getDatabase("sakila");
    collection = database.getCollection("films");
    for (Document cur : collection.find()) {
        System.out.println(cur.toJson());
    }
    mongoClient.close();
}

---

From source file:mongotweet.MongoTweet.java

public static void tweet(String uname, String tweet) {
    Random rand = new Random();
    String id = "" + rand.nextInt(99999999);

    Document doc = new Document().append("tweet_id", id).append("username", uname).append("body", tweet);
    insertDocument("tweets", doc);
    doc = new Document().append("tweet_id", id).append("username", uname).append("time",
            System.currentTimeMillis());
    insertDocument("timeline", doc);
    insertDocument("userline", doc);
    System.out.println(uname + ":" + tweet + " published");

    MongoCollection coll = db.getCollection("followers");
    BsonDocument where = new BsonDocument().append("username", new BsonString(uname));
    MongoCursor<Document> cursor = coll.find(where).iterator();

    String username;/*from www  . ja va 2  s  . c  o  m*/
    while (cursor.hasNext()) {
        Document tmp = cursor.next();
        username = (String) tmp.get("follower");
        doc = new Document().append("tweet_id", id).append("username", username).append("time",
                System.currentTimeMillis());
        insertDocument("timeline", doc);
    }
}

---

From source file:mongotweet.MongoTweet.java

public static void showTweet(String uname) {
    MongoCollection coll = db.getCollection("tweets");
    BsonDocument where = new BsonDocument().append("username", new BsonString(uname));
    MongoCursor<Document> cursor = coll.find(where).iterator();

    String username, body;//from  w w w.  j  a  va  2 s. co m
    while (cursor.hasNext()) {
        Document tmp = cursor.next();

        username = (String) tmp.get("username");
        body = (String) tmp.get("body");
        System.out.format("%s : %s \n", username, body);
    }
}

---

• «
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30
• 31
• 32
• 33
• »