使用java操作MongoDB

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使用java操作MongoDB

下载mongoDB对Java支持的驱动包
驱动包下载地址：
https://github.com/mongodb/mongo-java-driver/downloads

1、查询集合中所有文档

Mongo mongo = new Mongo("localhost",27017);DB db = mongo.getDB("test");DBCollection collection = db.getCollection("customer");DBCursor dbCursor = collection.find();System.out.println(collection.getCount());while(dbCursor.hasNext()){    System.out.println(dbCursor.next());}mongo.close();

2、删除集合中的文档

Mongo mongo = new Mongo("localhost",27017);DB db = mongo.getDB("test");DBCollection collection = db.getCollection("customer");BasicDBObject o = new BasicDBObject("_id", new ObjectId("5199ee647d5fc789bc760c07"));collection.remove(o);mongo.close();

3、向集合中插入文档

Mongo mongo = new Mongo("localhost",27017);DB db = mongo.getDB("test");DBCollection collection = db.getCollection("customer");DBObject c = new BasicDBObject();c.put("name", “jack");c.put("age", 24);collection.insert(c);mongo.close();

4、更新集合中的文档

Mongo mongo = new Mongo("localhost",27017);DB db = mongo.getDB("test");DBCollection collection = db.getCollection("customer");BasicDBObject query = new BasicDBObject("_id",new ObjectId("519e2e393296cf3baccdb10c"));BasicDBObject object = (BasicDBObject) collection.findOne(query);object.put("name", “wangwu");int n = collection.update(query, object).getN();System.out.println(n);mongo.close();

代码：

package cn.hcx.dao;import java.net.UnknownHostException;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;/** * 使用java 代码调用mongodb  * @author HCX * */public class MongoDao {    @Test    public void add() throws UnknownHostException{        Mongo mongo=new Mongo("127.0.0.1", 3333);        DB db=mongo.getDB("test");        DBCollection collection=db.getCollection("person");        //{key:value,key:value}        BasicDBObject dbObject=new BasicDBObject();        dbObject.put("name", "hcx");        dbObject.put("age", 18);        dbObject.put("sex", "女");        collection.insert(dbObject);        mongo.close();    }    @Test    public void del() throws UnknownHostException{        Mongo mongo=new Mongo("127.0.0.1", 3333);        DB db=mongo.getDB("test");        DBCollection collection=db.getCollection("person");        //{key:value}        //{$nor:[{name:”user2”},{age:3}]        //db.collection.find({age:{$gt:10}})        //{}        DBObject dbObject=new BasicDBObject();        //dbObject.put("key",{})  {key:{}}        collection.remove(dbObject);        mongo.close();    }    public void update(){    }    @Test    public void query() throws UnknownHostException{        Mongo mongo=new Mongo("127.0.0.1", 3333);        DB db=mongo.getDB("test");        DBCollection collection=db.getCollection("person");//      BasicDBObject dbObject=new BasicDBObject();//      dbObject.put("name", "hcx");        DBCursor dbCursor=collection.find();        while(dbCursor.hasNext()){            System.out.println(dbCursor.next().toString());        }    }}

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