org.einherjer.week2.samples.SortSkipLimitSample.java Source code

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Here is the source code for org.einherjer.week2.samples.SortSkipLimitSample.java

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/*
 * Copyright (c) 2008 - 2013 10gen, Inc. <http://10gen.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package org.einherjer.week2.samples;

import java.net.UnknownHostException;
import java.util.Random;

import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.Mongo;

public class SortSkipLimitSample {
    public static void main(String[] args) throws UnknownHostException {
        Mongo client = new Mongo();
        DB db = client.getDB("course");
        DBCollection lines = db.getCollection("sortSkipLimitSample");
        lines.drop();
        Random rand = new Random();

        // insert 10 lines with random start and end points
        for (int i = 0; i < 10; i++) {
            lines.insert(new BasicDBObject("_id", i)
                    .append("start", new BasicDBObject("x", rand.nextInt(2)).append("y", rand.nextInt(90) + 10))
                    .append("end", new BasicDBObject("x", rand.nextInt(2)).append("y", rand.nextInt(90) + 10)));
        }

        DBCursor cursor = lines.find().sort(new BasicDBObject("start.x", 1).append("start.y", -1)).skip(2)
                .limit(10);

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