Java程序中操作mongodb

来源：互联网发布：c#的json怎么用编辑：程序博客网时间：2024/05/29 14:17

之前说的都是在cmd窗口下操作mongodb数据库，现在介绍在java程序中操作的方式，与jdbc类似，也是先建立连接，然后再操作。

1.导入jar包，以eclipse为例，build path --》add external achive 引入jar包，这里用mongo-java-driver-1.0.jar

2.建立连接，多种方式

Mongo mg=new Mongo(); 默认连接到本机，端口为默认端口27017

Mongo mg=new Mongo("localhost",27017); 连接到本机，端口可以指定

Mongo mg=new Mongo("ip",27017); 指定ip，指定端口，注意ip需要用双引号括起来

3.获取数据库

DB db=mg.getDB("test"); 获取指定数据库

4.获取集合

DBCollection person=db.getCollection("person");

5.sql操作

DBCursor cur=person.find(); 查询所有集合所有数据，遍历游标即可获取所有数据

person.find(new BasicDBObject("name","lisi")); 查找指定的文档，如name为lisi

DBObject obj=new BasicDBObject();

obj.put("name","wangwu");

person.insert(obj); 插入文档

DBObject array=new BasicDBObject[2];

array[0]=new BasicDBObject(“name”,”lisi”).append(“age”,18);

array[1]=new BasicDBObject(“name”,”wangwu”).append(“age”,22);

person.insert(array); 批量插入记录

person.remove(new BasicDBObject("name","lisi")); 删除name为lisi的文档

person.ermove(new BasicDBObject()); 删除所有的文档

person.update(new BasiceDBObject("name","lisi"),new BasiceDBObject("name","lisi").append("age",19));

找到name为lisi的，修改它的age为19

以下为源码

package mongodb.test;import java.net.UnknownHostException;import java.util.ArrayList;import java.util.List;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.MongoException;public class MongoDB_Java {    public static void main(String[] args) throws UnknownHostException, MongoException {//connect();//queryAll();//insert();//insertBatch();//removeOne();removeAll();//update();}private static void connect() throws UnknownHostException, MongoException{Mongo mg=new Mongo();DB db=mg.getDB("test");DBCollection person=db.getCollection("person");System.out.println(person.getCount());}private static void queryAll()throws UnknownHostException, MongoException{Mongo mg=new Mongo("localhost",27017);DB db=mg.getDB("test");DBCollection person=db.getCollection("person");DBCursor cur=person.find();while(cur.hasNext()){System.out.println(cur.next());}}private static void insert() throws UnknownHostException, MongoException{Mongo mg=new Mongo("192.168.42.182",27017);DB db=mg.getDB("test");DBCollection person=db.getCollection("person");DBObject obj=new BasicDBObject();obj.put("name","zhaoliu");obj.put("age",30);person.insert(obj);}private static void insertBatch() throws UnknownHostException, MongoException{Mongo mg=new Mongo();DB db=mg.getDB("test");DBCollection person=db.getCollection("person");//DBObject[] array=new BasicDBObject[3];//array[0]=new BasicDBObject("name","tianqi").append("age",44);//array[1]=new BasicDBObject("name","wangba").append("age",56);//array[2]=new BasicDBObject("name","linjiu").append("age",22);//person.insert(array);List<DBObject> list=new ArrayList<DBObject>();DBObject user=new BasicDBObject("name","lishi").append("age",12);DBObject user2=new BasicDBObject("name","luoshiyi").append("age",18);DBObject user3=new BasicDBObject("name","chenshier").append("age",28);list.add(user);list.add(user2);list.add(user3);person.insert(list);}private static void removeOne() throws UnknownHostException, MongoException{Mongo mg=new Mongo();DB db=mg.getDB("test");DBCollection person=db.getCollection("person");person.remove(new BasicDBObject("name","chenshier"));}private static void removeAll() throws UnknownHostException, MongoException{Mongo mg=new Mongo();DB db=mg.getDB("test");DBCollection person=db.getCollection("person");person.remove(new BasicDBObject());}private static void update()throws UnknownHostException, MongoException{Mongo mg=new Mongo();DB db=mg.getDB("test");DBCollection person=db.getCollection("person");//person.update(new BasicDBObject("name","zhangsan"),//new BasicDBObject("name","zhangsan").append("age",88));person.updateMulti(new BasicDBObject("name","lisi"), new BasicDBObject("name","lisi").append("age",66));}}

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