【MongoDB for Java 1】

// 获得数据库服务

		Mongo m = new Mongo("localhost", 27017);

		// 得到数据库mytest

		DB db = m.getDB("dbtest");

		// 得到mytest数据库下所有表名

		Set<String> colls = db.getCollectionNames();
		System.out.println(colls.size());

		for (String s : colls) {

			System.out.println(s);

		}
		// 查询所有的数据
		DBCollection employee = db.getCollection("employee");
		DBCursor cur = employee.find();
		while (cur.hasNext()) {
			System.out.println(cur.next());
		}
		System.out.println(cur.count());
		System.out.println(JSON.serialize(cur));

		DBObject user1 = new BasicDBObject();    
		user1.put("uname", "Lucy");   
		user1.put("age", 21);
		user1.put("salary", 2000);

		DBObject user2 = new BasicDBObject();    
		user2.put("uname", "Lily");   
		user2.put("age", 22);
		user2.put("salary", 3000);

		List<DBObject> list = new ArrayList<DBObject>();
		list.add(user1);
		list.add(user2);
		//添加一条数据
		//employee.save(user1);
		//添加数组数据
		//employee.insert(list);
		System.out.println(employee.insert(list).getN());
		/*修改一条*/
		System.out.println("修改：" + employee.update(            
				 new BasicDBObject("_id", new ObjectId("50dbfa0ee0184dac4dad2781")),             
				 new BasicDBObject("uname", "didi"),
				 true,//如果数据库不存在，是否添加            
				 false//多条修改            
				 ).getN());