不适用于MongoDB的NodeJS数据库操作

Question

我试图在MongoDB中使用Node.js，但它不是使用最简单的代码。

最简单的代码：

var MongoClient = require('mongodb').MongoClient;
var url = "mongodb://localhost:27017/mydb";
MongoClient.connect(url, function (err, db) {
  if (err) throw err;
  console.log("Database created!");
  db.close();
});

错误：

D:\Clg\Sem-5\Software Packages\Lab\Practical-7\node_modules\mongodb\lib\sdam\topology.js:292
                const timeoutError = new error_1.MongoServerSelectionError(`Server selection timed out after ${serverSelectionTimeoutMS} ms`, this.description);
                                     ^

MongoServerSelectionError: connect ECONNREFUSED ::1:27017
    at Timeout._onTimeout (D:\Clg\Sem-5\Software Packages\Lab\Practical-7\node_modules\mongodb\lib\sdam\topology.js:292:38)
    at listOnTimeout (node:internal/timers:564:17)
    at process.processTimers (node:internal/timers:507:7) {
  reason: TopologyDescription {
    type: 'Unknown',
    servers: Map(1) {
      'localhost:27017' => ServerDescription {
        address: 'localhost:27017',
        type: 'Unknown',
        hosts: [],
        passives: [],
        arbiters: [],
        tags: {},
        minWireVersion: 0,
        maxWireVersion: 0,
        roundTripTime: -1,
        lastUpdateTime: 2642697,
        lastWriteDate: 0,
        error: MongoNetworkError: connect ECONNREFUSED ::1:27017
            at connectionFailureError (D:\Clg\Sem-5\Software Packages\Lab\Practical-7\node_modules\mongodb\lib\cmap\connect.js:387:20)
            at Socket.<anonymous> (D:\Clg\Sem-5\Software Packages\Lab\Practical-7\node_modules\mongodb\lib\cmap\connect.js:310:22)
            at Object.onceWrapper (node:events:628:26)
            at Socket.emit (node:events:513:28)
            at emitErrorNT (node:internal/streams/destroy:151:8)
            at emitErrorCloseNT (node:internal/streams/destroy:116:3)
            at process.processTicksAndRejections (node:internal/process/task_queues:82:21) {
          cause: Error: connect ECONNREFUSED ::1:27017
              at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1247:16) {
            errno: -4078,
            code: 'ECONNREFUSED',
            syscall: 'connect',
            address: '::1',
            port: 27017
          },
          [Symbol(errorLabels)]: Set(1) { 'ResetPool' }
        },
        topologyVersion: null,
        setName: null,
        setVersion: null,
        electionId: null,
        logicalSessionTimeoutMinutes: null,
        primary: null,
        me: null,
        '$clusterTime': null
      }
    },
    stale: false,
    compatible: true,
    heartbeatFrequencyMS: 10000,
    localThresholdMS: 15,
    setName: null,
    maxElectionId: null,
    maxSetVersion: null,
    commonWireVersion: 0,
    logicalSessionTimeoutMinutes: null
  },
  code: undefined,
  [Symbol(errorLabels)]: Set(0) {}
}

Node.js v18.7.0

我测试了最新版本和5.0.13版本的错误，但我也有相同的错误&当我在互联网上搜索时，我发现MongoDB服务应该有问题，但当我检查它时。我发现那个服务已经在运行了。

Answer 1

ECONNREFUSED通常意味着MongoDB不在您提供的URL上运行，或者您的应用程序无法访问该端口。您肯定是在27017端口本地运行MongoDB吗？您需要确保本地MongoDB实例已启动并可用--尝试通过浏览器导航到localhost:27017来访问它。