如何使用 Node.js 连接到 mongoDB 指南针

Question

我正在尝试将数据从 node.js 发送到 mongoDB 指南针服务器。 我已经创建了一个 MongoDB 集群并下载了 Compass。 我可以将 Compass 连接到集群，一切正常。

但是，当我尝试将 Node.js 服务器连接到 Compass 时，出现错误，下面是我的节点代码。

const express = require('express');

const MongoClient = require('mongodb').MongoClient;
const assert = require('assert');



const app = express();

// Connect to mongodb
// Connection URL

const url = "mongodb://tfi-mfgbt.mongodb.net/test" ;

// Database Name
const dbName = 'TFI';

// Use connect method to connect to the server
MongoClient.connect(url, function(err, client) {
  assert.equal(null, err);
  console.log("Connected successfully to server");

  const db = client.db(dbName);

  client.close();
});


const port = 5000;

app.listen(port, () => {
    console.log(`Server started on port ${port}`);
});

一个我在终端运行 Node app.js 我得到

MongoClient.connect.                                                                                                                                                              
Server started on port 5000                                                                                                                                                       
F:\code\vidjot\node_modules\mongodb\lib\operations\mongo_client_ops.js:439                                                                                                        
      throw err;                                                                                                                                                                  
      ^                                                                                                                                                                           

AssertionError [ERR_ASSERTION]: null == 'MongoNetworkError: failed to connect to server [tfi-mfgbt.mongodb.net:27017] on first connect [MongoNetworkError: getaddrinfo E          
    at F:\code\vidjot\app.js:20:10                                                                                                                                                
    at err (F:\code\vidjot\node_modules\mongodb\lib\utils.js:415:14)                                                                                                              
    at executeCallback (F:\code\vidjot\node_modules\mongodb\lib\utils.js:404:25)                                                                                                  
    at err (F:\code\vidjot\node_modules\mongodb\lib\operations\mongo_client_ops.js:284:21)                                                                                        
    at connectCallback (F:\code\vidjot\node_modules\mongodb\lib\operations\mongo_client_ops.js:240:5)                                                                             
    at process.nextTick (F:\code\vidjot\node_modules\mongodb\lib\operations\mongo_client_ops.js:436:7)                                                                            
    at _combinedTickCallback (internal/process/next_tick.js:131:7)                                                                                                                
    at process._tickCallback (internal/process/next_tick.js:180:9)                                                                                                                
[nodemon] app crashed - waiting for file changes before starting...                       

主机名“mongodb://tfi-mfgbt.mongodb.net/test”是我的 Compass 会话的主机名。 如这里所见

Answer 1

要与 Mongo 连接，我使用以下代码行：

var mongoUrl = '"mongodb://tfi-mfgbt.mongodb.net/test"'
var mongoose = require('mongoose')
mongoose.connect(mongoUrl, { useMongoClient: true })
mongoose.connection.on('error', err => debug('MongoDB connection error: ${err}'));

这应该对你有用！

并查询：

mySchema.find({},function(err, docs){... My code ...})