如何正确连接到 mongodb.atlas？ MongoNetworkError

Question

我正在学习如何将 MongoDB 与 node.js 一起使用，因此我正在制作一个 Restful API 作为练习。

但每当我尝试连接到 mongo 的地图集时，我都会收到“MongoNetworkError: getaddrinfo ENOTFOUND”。

我的代码server.js:

// call the packages
var bodyParser = require('body-parser');
var Bear = require('./app/models/bear');
var mongoose = require('mongoose');

var express = require('express');
var app = express();

const MongoClient = require('mongodb').MongoClient;
const uri = "mongodb://<userName>:<pasword>@cluster0-<someCharacters>.mongodb.net/test?retryWrites=true&w=majority";
const client = new MongoClient(uri, { useNewUrlParser: true });
client.connect( err => {
  console.log(err);
  //const collection = client.db("test").collection("devices");
  client.close();
});

/*rest of the code is commented out*/
...

它记录以下错误：

{ MongoNetworkError: failed to connect to server [cluster0-<someCharacters>.mongodb.net:27017] on first connect [MongoNetworkError: getaddrinfo ENOTFOUND cluster0-<someCharacters>.mongodb.net cluster0-<someCharacters>.mongodb.net:27017]
at Pool.<anonymous> (/app/node_modules/mongodb-core/lib/topologies/server.js:431:11)
at Pool.emit (events.js:198:13)
at connect (/app/node_modules/mongodb-core/lib/connection/pool.js:557:14)
at makeConnection (/app/node_modules/mongodb-core/lib/connection/connect.js:39:11)
at callback (/app/node_modules/mongodb-core/lib/connection/connect.js:261:5)
at Socket.err (/app/node_modules/mongodb-core/lib/connection/connect.js:286:7)
at Object.onceWrapper (events.js:286:20)
at Socket.emit (events.js:198:13)
at emitErrorNT (internal/streams/destroy.js:91:8)
at emitErrorAndCloseNT (internal/streams/destroy.js:59:3)
at process._tickCallback (internal/process/next_tick.js:63:19)
name: 'MongoNetworkError',
errorLabels: [ 'TransientTransactionError' ],
[Symbol(mongoErrorContextSymbol)]: {} }

注释：

• <userName>、<pasword>、<someCharacters> 相应地表示字符
• 我在笔记本电脑和 Heroku 上都得到了相同的结果
• 如果在本地设置 MongoDB，它可以在 localhost 上正常工作
• 我直接从 cloud.mongodb.com 获得了连接字符串

我可能做错了什么？

Answer 1

你安装了 mongoose，但你正在尝试连接 mongodb 包。因为你安装了猫鼬

const mongoUri="your connection string here"
mongoose.connect(mongoUri,{useNewUrlParser:true})
.catch((e)=>{
    console.log(e.message)
    process.exit(1)
})
.then(()=>{
    console.log("connected to Mongo Atlas")
})

mongoose.connect 返回承诺。如果有错误，连接将被拒绝，它会记录错误然后退出进程。如果连接成功，则表示 promise 已解决，因此它将连接，然后记录“已连接到 Mongo Atlas”

但是我建议你检查你的连接字符串。它应该有“+srv”，像这样

  mongodb+srv://