MongoDB学习笔记：(3)、mongodb 3.2在java环境中的简单CRUD

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本文介绍了一个简单的MongoDB CRUD操作示例，包括连接数据库、查询、插入、删除和更新记录等基本功能。通过Java代码实现，并使用了mongo-java-driver-3.2.2驱动。

首先新建一个java project项目，去下载mongo-java-driver-3.2.2.jar包。build path导入junit需要的jar包。另外运行代码前先要启动mongod 服务。下面就是简单的CRUD代码：

package com.mongodb;

import junit.framework.TestResult;

import org.bson.Document;
import org.bson.conversions.Bson;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;


public class MongoDBTest {
	
	private  MongoDatabase db=null;
	
	private MongoClient mongoClient=null;
	
	@Before
	public void init(){
		mongoClient=new MongoClient("127.0.0.1:27017");
		db=mongoClient.getDatabase("test");
	}
	
	@Test
	public void testQuery() {
		
		MongoCollection<Document> collec=db.getCollection("people");
		System.out.println(collec);
		MongoCursor<Document> cursor=collec.find().iterator();
		while(cursor.hasNext()){
			Document obj=(Document)cursor.next();
			System.out.println(obj.get("name")+","+obj.get("age"));
		}
		
		
	}
	
	@Test
	public void testAdd(){
		MongoCollection<Document> peoples=db.getCollection("people");
		Document doc=new Document();
		doc.put("name", "xiaoming");
		doc.put("age", 23);
		peoples.insertOne(doc);
	}
	
	@Test
	public void remove(){
		MongoCollection<Document> peoples=db.getCollection("people");
		Document doc=new Document();
		doc.put("name", "xiaoming");
		peoples.deleteMany(doc);
	}
	
	@Test
	public void update(){
		
		MongoCollection<Document> peoples=db.getCollection("people");
		Document bson=new Document();
		bson.put("name", "xiaoming");
		
		Document bson1=new Document();
		bson1.put("name", "xiaoming");
		bson1.put("age", "26");
		
		UpdateResult result=peoples.replaceOne(bson, bson1);//用updateOne会报错
		System.out.println("修改行数:"+result.getModifiedCount());

	}
	
	
	@After
	public void tesRelease(){
		
		if(mongoClient!=null){
			mongoClient.close();
		}
	}

}