Java操作MongoDB之CRUD（增删改查）

上一篇文章：MongoDB入门学习

http://blog.csdn.net/rjfxd/article/details/12108909

一、准备工作

1、建立maven项目，添加所需依赖

<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.10</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.mongodb</groupId>
<artifactId>mongo-java-driver</artifactId>
<version>2.11.3</version>
</dependency>

当然也可以建立java project，下载mongoDB对Java支持的驱动包，然后拷贝jar文件到lib下

2、开启mongo服务，建立测试类进行测试

二、完整源码如下：

package com.shxt.mongo;import java.net.UnknownHostException;import java.util.ArrayList;import java.util.List;import org.bson.types.ObjectId;import org.junit.After;import org.junit.Before;import org.junit.Test;import com.mongodb.BasicDBObject;import com.mongodb.DB;import com.mongodb.DBCollection;import com.mongodb.DBCursor;import com.mongodb.DBObject;import com.mongodb.Mongo;import com.mongodb.MongoClient;import com.mongodb.util.JSON; /**  * MongDB之CRUD  * @author 范晓东  * @ClassName: TestMongo  * @Version 1.0  * @ModifiedBy   * @Copyright shxt  * @date 2013-9-27 下午08:21:49  * @description   */public class TestMongo {private Mongo mg = null;private DB db;private DBCollection users;@Beforepublic void setUp() throws UnknownHostException {// 创建一个MongoDB的数据库连接对象mg=new MongoClient("localhost", 27017);//验证模式登录(如果不设置验证模块，可直接登录)//想要登录验证模块生效,需在命令行下输入1->mongo 2->use admin 3->db.addUser("root","root123"); 4->db.auth("root","root123");DB admin=mg.getDB("admin");boolean bool =admin.authenticate("root", "root123".toCharArray());if (bool){//login success//获得一个test的数据库，如果该数据库不存在，会自动创建db=mg.getDB("test");}// 获取一个聚集集合DBCollection,相当于我们的数据库表users = db.getCollection("users");}@Testpublic void testQuery() {//查询所有的数据库for (String name : mg.getDatabaseNames()) {System.out.println("dbName: " + name);}//查询所有的聚集集合for (String name : db.getCollectionNames()) {System.out.println("collectionName: " + name);}//查询所有的数据DBCursor cur = users.find();while (cur.hasNext()) {System.out.println(cur.next());}//其它System.out.println(cur.count());System.out.println(users.count());System.out.println(cur.getCursorId());System.out.println(JSON.serialize(cur));//JSON对象转换 }@Testpublic void testQuery2(){    //根据id查询List<DBObject> list=users.find(new BasicDBObject("_id", new ObjectId("5243871a0609f38c8a7a5ccd"))).toArray();System.out.println(list.get(0).get("name"));  //根据age查询，从第一条开始取，取3条数据BasicDBObject user = new BasicDBObject();user.put("age", new BasicDBObject("$gte", 20));DBCursor cur=users.find(user).skip(0).limit(3);System.out.println(cur.count());while (cur.hasNext()) {System.out.println(cur.next());}          //查询age!=25    //users.find(new BasicDBObject("age", new BasicDBObject("$ne", 25))).toArray();    //查询age in 25/26/27    //users.find(new BasicDBObject("age", new BasicDBObject(QueryOperators.IN, new int[] { 25, 26, 27 }))).toArray();    //查询age not in 25/26/27    //users.find(new BasicDBObject("age", new BasicDBObject(QueryOperators.NIN, new int[] { 25, 26, 27 }))).toArray();//查询存在age的数据    //users.find(new BasicDBObject("age", new BasicDBObject(QueryOperators.EXISTS, true))).toArray();    //只查询age属性    //users.find(null, new BasicDBObject("age", true)).toArray();        //只查询一条数据，多条取第一条    //users.findOne();    //users.findOne(new BasicDBObject("age", 26));    //users.findOne(new BasicDBObject("age", 26), new BasicDBObject("name", true));        //查询age=25的数据并删除    //users.findAndRemove(new BasicDBObject("age", 25));       //查询age=26的数据，并且修改name的值为abc    //users.findAndModify(new BasicDBObject("age", 26), new BasicDBObject("name", "abc"));}@Testpublic void testAdd() {DBObject user = new BasicDBObject();user.put("name", "fxd");user.put("age", 21);user.put("sex", "男");users.save(user);//查看是否添加成功DBCursor cur = users.find();while (cur.hasNext()) {System.out.println(cur.next());}}@Testpublic void testAdd2() {DBObject user1 = new BasicDBObject("name","张三");DBObject user2 = new BasicDBObject("age",20);users.insert(user1,user2);//查看是否添加成功DBCursor cur = users.find();while (cur.hasNext()) {System.out.println(cur.next());}}@Testpublic void testAdd3() {DBObject user1 = new BasicDBObject("name","张三");DBObject user2 = new BasicDBObject("age",20);List<DBObject> list = new ArrayList<DBObject>();list.add(user1);list.add(user2);users.insert(list);//查看是否添加成功DBCursor cur = users.find();while (cur.hasNext()) {System.out.println(cur.next());}}@Testpublic void testRemove(){    users.remove(new BasicDBObject("_id", new ObjectId("524378680609ad5717421c6a")));    //users.remove(new BasicDBObject("age", new BasicDBObject("$gte", 24)));}@Testpublic void update(){ //=update users set age=17 where name='fxd'; users.update(  new BasicDBObject("name","fxd"),//new BasicDBObject().append("name","fxd"),    new BasicDBObject("$set" ,new BasicDBObject("age",17)),          false,//如果users中不存在age字段，是否更新，false表示不更新          false//只修改第一条，true表示修改多条 );     }@Testpublic void update2(){ //批量修改，也可以用users.update(),把第四个参数改为true即可 //=update users set age=age+10 where name='fxd'; users.updateMulti(  new BasicDBObject().append("name","fxd"),  new BasicDBObject("$inc",new BasicDBObject("age", 10)));     }@Afterpublic void tearDown() {if (mg != null) {if (db != null) {// 结束Mongo数据库的事务请求try {db.requestDone();} catch (Exception e) {e.printStackTrace();}}try {mg.close();} catch (Exception e) {e.printStackTrace();}mg = null;db = null;}}}

参考：

http://www.cnblogs.com/hoojo/archive/2011/06/02/2068665.html