通过节点服务器连接到MongoDB的警告 [英] Warning on Connecting to MongoDB with a Node server

问题描述

我编写了以下代码，以通过本机驱动程序连接mongodb，该本机驱动程序已安装 npm install mongodb --save

I wrote following code to connect mongodb through native driver which has been install with npm install mongodb --save

const MongoClient = require("mongodb").MongoClient;
const url = "mongodb://127.0.0.1:27017";

const dbName = "game-of-thrones";
let db;

MongoClient.connect(
url,
 { useNewUrlParser: true },
  (err, client) => {
    if (err) return console.log(err);

  db = client.db(dbName);
   console.log(`Connected MongoDB: ${url}`);
   console.log(`Database: ${dbName}`);
  }
);

当我在终端上写 node server.js 我收到以下错误

When I write on the terminal node server.js I got following error

（node：3500）DeprecationWarning：当前的服务器发现和监视引擎已弃用，并将在未来版本。要使用新的服务器发现和监视引擎，请将选项{useUnifiedTopology：true}传递给MongoClient.connect。
已连接MongoDB：mongodb：//127.0.0.1：27017
数据库：权力游戏

(node:3500) DeprecationWarning: current Server Discovery and Monitoring engine is deprecated, and will be removed in a future version. To use the new Server Discover and Monitoring engine, pass option { useUnifiedTopology: true } to MongoClient.connect. Connected MongoDB: mongodb://127.0.0.1:27017 Database: game-of-thrones

数据库已连接，但是如何摆脱警告

The database is connected, but how can I get rid out from the warning

推荐答案

检查您的mongo版本

Check your mongo version

 mongo --version

如果使用的版本> = 3.1.0，请将mongo连接文件更改为->

If you are using version >= 3.1.0 change you mongo connection file to ->

 MongoClient.connect("mongodb://localhost:27017/YourDB", {
   useNewUrlParser: true,
   useUnifiedTopology: true
 })

有关3.2.1中添加的 useUnifiedTopology 选项的详细信息，请参见 https://github.com/mongodb/node-mongodb-native/releases/tag/v3.2.1

For details about the useUnifiedTopology option added in 3.2.1, see https://github.com/mongodb/node-mongodb-native/releases/tag/v3.2.1

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