Java tutorial
/* * 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 com.tengen; import com.mongodb.BasicDBObject; import com.mongodb.DB; import com.mongodb.DBCollection; import com.mongodb.MongoClient; import com.mongodb.DBCursor; import java.io.IOException; import java.net.UnknownHostException; public class Final7 { public static void main(String[] args) throws IOException { MongoClient client = new MongoClient(); DB db = client.getDB("photoshare"); int i = 0; DBCollection album = db.getCollection("albums"); DBCollection image = db.getCollection("images"); DBCursor cur = image.find(); cur.next(); while (cur.hasNext()) { Object id = cur.curr().get("_id"); DBCursor curalbum = album.find(new BasicDBObject("images", id)); if (!curalbum.hasNext()) { image.remove(new BasicDBObject("_id", id)); } cur.next(); } } }