Java操作MongoDB：连接&增&删&改&查

1.连接

①方式一

        MongoClientOptions.Builder builder = MongoClientOptions.builder(); //可以通过builder做各种详细配置
        MongoClientOptions myOptions = builder.build();
        ArrayList<ServerAddress> serverAddressList = new ArrayList();
        ServerAddress record = new ServerAddress("localhost", 27017); //IP、端口
        serverAddressList.add(record);

        //用户名、默认库名、密码
        MongoCredential credential = MongoCredential.createCredential("testUser", "test", "testPwd".toCharArray());
        MongoClient mongoClient = new MongoClient(serverAddressList, credential, myOptions);

②方式二

        //用户名、密码、IP、端口、默认库名
        String sURI = String.format("mongodb://%s:%s@%s:%d/%s", "testUser", "testPwd", "localhost", 27017, "test");
        MongoClient mongoClient = new MongoClient(new MongoClientURI(sURI));

③方式三（没开启权限验证模式时可使用）

        //不使用用户名和密码直接进行登陆（方便初学者，避免过于复杂的设置）
        MongoClient mongoClient = new MongoClient("localhost", 27017);

 

2.中间步骤（创建一个collection存放数据，相当于表table）

        MongoDatabase dbTest = mongoClient.getDatabase("test");

        //如果不存在，则增加collection
        MongoCollection<Document> collection = dbTest.getCollection("test_collection");
        if (collection == null) {
            dbTest.createCollection("test_collection");
        }

 

3.insert

        //insert 增加数据
        Document doc = new Document();
        doc.append("Name", "name1");
        doc.append("Age", 20);
        //collection.insertOne(doc); //增加一条数据

        //增加多条数据
        Document doc2 = new Document();
        doc2.append("Name", "name2");
        doc2.append("Age", 30);

        ArrayList dataList = new ArrayList();
        dataList.add(doc);
        dataList.add(doc2);
        collection.insertMany(dataList);

 

4.delete

        //delete 删除数据
        BasicDBObject delSql = new BasicDBObject("Name", "name1");
        collection.findOneAndDelete(delSql); //删除一条
        //collection.deleteMany(delSql); //删除多条

 

5.update

        //update 修改数据
        BasicDBObject updateOldSql = new BasicDBObject("Name", "name2");
        //更新一条数据
        BasicDBObject updateNewOneSql = new BasicDBObject("$set", new BasicDBObject("Name", "name1"));
        //collection.updateOne(updateOldSql,updateNewOneSql);

        //更新多条数据
        BasicDBObject updateNewManySql = new BasicDBObject("$set", new BasicDBObject("Name", "name1").append("Age",66)); //修改多个字段
        collection.updateMany(updateOldSql, updateNewManySql);

 

6.query

        //查询数据
        BasicDBObject querySql = new BasicDBObject("Name", "name1");
        FindIterable<Document> queryRst = collection.find(querySql); //这里可以做sort和filter等操作
        MongoCursor<Document> cursor = queryRst.iterator();
        while (cursor.hasNext()){
            System.out.println(cursor.next());//输出每一行数据
        }

 

以上。