java操作mongodb

最新推荐文章于 2024-11-15 15:36:57 发布

转载最新推荐文章于 2024-11-15 15:36:57 发布 · 1.5k 阅读

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#mongodb #java #string #数据库

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本文介绍了使用 MongoDB 连接数据库、查询集合、过滤数据、插入、删除、更新及获取单条记录的基本操作。

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package com.mongodb;

public class Mongodb {

    private Mongo mongo;
    private DBCollection dbCollection;
    private DB db;

    public Mongodb() throws Exception{
        //使用ip地址创建Mongo对象
        mongo=new Mongo("127.0.0.1");
        //获取orcl数据库
        db=mongo.getDB("orcl");
        //判断是否存在集合person
        boolean b=db.collectionExists("person");
        System.out.println("是否存在集合[person]:"+b);
        dbCollection = db.getCollection("person");
        long count=dbCollection.count();
        System.out.println("总记录数是:"+count);
        DBCursor cursor =dbCollection.find().skip(20).limit(20);
        while(cursor.hasNext()){
            System.out.println(cursor.next());
        }


    }



    public void list(){
        dbCollection=db.getCollection("person");
        BasicDBObject dbObject=new BasicDBObject();
        dbObject.put("age", new BasicDBObject("$gt",20).append("$lt", 60));
        DBCursor cursor = dbCollection.find(dbObject);
        System.out.println(cursor.count());
        while(cursor.hasNext()){
            System.out.println(cursor.next());
        }

    }



    private boolean insert(){

        dbCollection=db.getCollection("person");
        BasicDBObject dbObject=new BasicDBObject();
        dbObject.put("name", "zhangsan");
        dbObject.put("age", 20);
        WriteResult writeResult = dbCollection.save(dbObject);
        System.out.println(writeResult.getN());
        return false;
    }

    private boolean delete(){
        dbCollection=db.getCollection("person");
        BasicDBObject dbObject=new BasicDBObject();
        dbObject.put("name", "zhangsan");
        WriteResult writeResult = dbCollection.remove(dbObject);
        System.out.println(writeResult.getN());
        return false;
    }


    private boolean update(){
        dbCollection=db.getCollection("person");
        BasicDBObject dbObject=new BasicDBObject();
        dbObject.put("name", "s0020");
        BasicDBObject dbObject2=new BasicDBObject();
        dbObject2.put("name", "s0020");
        dbObject2.put("age", 65);
        WriteResult writeResult = dbCollection.update(dbCollection.findOne(dbObject), dbObject2);
        System.out.println(writeResult.getN());
        return false;
    }


    private Object getOne(){
        dbCollection=db.getCollection("person");
        BasicDBObject dbObject=new BasicDBObject();
        dbObject.put("name", "s0020");
        //dbObject.put("age", 65);
        DBObject object=dbCollection.findOne(dbObject);
        System.out.println(object.toMap().get("name")+"\t"+object.toMap().get("age"));
        return object;
    }


    public static void main(String[] args) throws Exception{
        Mongodb mongodb=new Mongodb();
        //mongodb.insert();
        //mongodb.getOne();
        //mongodb.update();
        //mongodb.delete();
        //mongodb.list();
    }
}