node.js - 无法在 Node.js 的本地主机上访问 MongoDB

问题描述

我正在尝试在 Node.js 中运行 MongoDB。我已经在 C:\mongodb 下安装了 MongoDB 的社区服务器版本（v. 5.0.3）。

在子文件夹“data”中，我创建了另一个文件夹“db”，该文件夹当前为空。

当我在 mongo.exe、Windows 终端甚至 Node.js 的终端中运行 mongoDB 时，似乎一切正常。我可以查看我的数据库并创建新的数据库和集合。我还可以在 Compass 中访问我的数据库（连接 mongodb://localhost:27017）。

正如我所说，我的“data/db”文件夹是空的，即使我已经创建了一个新数据库，所以我的数据库似乎存储在其他地方。这是一个问题吗？

在 Node.js 中，我尝试使用 Mongoose 连接到 MongoDB。我尝试了几种不同的方法，取得了不同程度的成功。此代码始终相同：

// Dependencies:
const express = require('express')
const app = express()
const mongoose = require('mongoose')

// Validate connection:
mongoose.connection.once('open', () => console.log('Connected do database'))
mongoose.connection.on('error', err => console.error('connection error:', err))

app.listen(5000, () => console.log('Server started'))

此 URL 有效（似乎）：

// Connecting to database:
mongoose.connect('mongodb://127.0.0.1:27017/testdb', { useNewUrlParser: true })

在控制台中，我得到“服务器已启动”，然后是“连接到数据库”。

但是，YouTube 教程中建议的这个 URL 不起作用：

// Connecting to database:
mongoose.connect('mongodb://localhost/testdb', { useNewUrlParser: true })

在控制台中，我得到“服务器已启动”，但没有“连接到数据库”。然后，半分钟后，应用程序崩溃，我收到以下错误消息（我已经审查了一些个人信息）：

connection error: MongooseServerSelectionError: connect ECONNREFUSED ::1:27017
    at NativeConnection.Connection.openUri (C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongoose\lib\connection.js:797:32)
    at C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongoose\lib\index.js:330:10
    at C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongoose\lib\helpers\promiseOrCallback.js:32:5
    at new Promise (<anonymous>)
    at promiseOrCallback (C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongoose\lib\helpers\promiseOrCallback.js:31:10)
    at Mongoose._promiseOrCallback (C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongoose\lib\index.js:1151:10)
    at Mongoose.connect (C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongoose\lib\index.js:329:20)
    at Object.<anonymous> (C:\Users\xxx\Documents\xxx\xxx\xxx\app.js:13:10)
    at Module._compile (node:internal/modules/cjs/loader:1095:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1147:10) {
  reason: TopologyDescription {
    type: 'Unknown',
    servers: Map(1) { 'localhost:27017' => [ServerDescription] },
    stale: false,
    compatible: true,
    heartbeatFrequencyMS: 10000,
    localThresholdMS: 15,
    logicalSessionTimeoutMinutes: undefined
  }
}
node:internal/process/promises:246
          triggerUncaughtException(err, true /* fromPromise */);
          ^

MongooseServerSelectionError: connect ECONNREFUSED ::1:27017
    at NativeConnection.Connection.openUri (C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongoose\lib\connection.js:797:32)
    at C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongoose\lib\index.js:330:10
    at C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongoose\lib\helpers\promiseOrCallback.js:32:5
    at new Promise (<anonymous>)
    at promiseOrCallback (C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongoose\lib\helpers\promiseOrCallback.js:31:10)
    at Mongoose._promiseOrCallback (C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongoose\lib\index.js:1151:10)
    at Mongoose.connect (C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongoose\lib\index.js:329:20)
    at Object.<anonymous> (C:\Users\xxx\Documents\xxx\xxx\xxx\app.js:13:10)
    at Module._compile (node:internal/modules/cjs/loader:1095:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1147:10) {
  reason: TopologyDescription {
    type: 'Unknown',
    servers: Map(1) {
      'localhost:27017' => ServerDescription {
        _hostAddress: HostAddress { isIPv6: false, host: 'localhost', port: 27017 },
        address: 'localhost:27017',
        type: 'Unknown',
        hosts: [],
        passives: [],
        arbiters: [],
        tags: {},
        minWireVersion: 0,
        maxWireVersion: 0,
        roundTripTime: -1,
        lastUpdateTime: 4303888,
        lastWriteDate: 0,
        error: MongoNetworkError: connect ECONNREFUSED ::1:27017
            at connectionFailureError (C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongodb\lib\cmap\connect.js:293:20)
            at Socket.<anonymous> (C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongodb\lib\cmap\connect.js:267:22)
            at Object.onceWrapper (node:events:510:26)
            at Socket.emit (node:events:390:28)
            at emitErrorNT (node:internal/streams/destroy:164:8)
            at emitErrorCloseNT (node:internal/streams/destroy:129:3)
            at processTicksAndRejections (node:internal/process/task_queues:83:21)
      }
    },
    stale: false,
    compatible: true,
    heartbeatFrequencyMS: 10000,
    localThresholdMS: 15,
    logicalSessionTimeoutMinutes: undefined
  }
}

Node.js v17.0.1
[nodemon] app crashed - waiting for file changes before starting...

我的设置是否错误，因为我无法在 localhost 上访问 MongoDB？

标签： node.jsmongodbmongoose

node.js - 无法在 Node.js 的本地主机上访问 MongoDB

问题描述

解决方案

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