package com.gs;

import org.bson.Document;
import com.mongodb.MongoClient;
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;

public class HelloMongodb
{
    public static void main(String[] args)
    {
        try
        {
            /*
             * MongoClient               连接服务器
             * MongoDatabase             连接数据库
             * MongoCollection           连接表
             * FindIterable<Document>    记录型迭代器
             * MongoCursor               记录游标
             * 应用顺序： 服务器-->数据库-->表-->记录迭代器-->记录游标
             */
            MongoClient mongoClient = new MongoClient("localhost", 27017);            
            MongoDatabase mongoDatabase = mongoClient.getDatabase("mywork");            
            MongoCollection<Document> collection = mongoDatabase.getCollection("student");
            FindIterable<Document> findIterable = collection.find();  
            MongoCursor<Document> mongoCursor = findIterable.iterator();  
            
            /*
             * 游标滚动-->获取记录-->读取字段值         
             */
            while(mongoCursor.hasNext()){  
                Document studentDocument = mongoCursor.next();
                System.out.println(studentDocument.getString("name") +", " );
                //System.out.println(mongoCursor.next());  
             }  
        }
        catch (Exception e)
        {
            System.err.println(e.getMessage());
        }
        
    }
}