Question

我试图让 mongo db 存储数字 1 到 9999 拳头它会存储 0 到 1 然后是 0 到 2 等等....

for(var i = 0; i <= 9999; ++i) {
    console.log(i);
    a += i + " ";
    add(a, i);
}

并且我向对象添加了另一个变量以显示最后一个数字当我运行此代码时：

var a = [];
const MongoClient = require('mongodb').MongoClient;
const url = "mongodb://localhost:27017/";
const dbName = 'numbzzz';

function add(item, lastnum) {
    return new Promise(async (resolve, reject) => {
        const client = new MongoClient(url);
        try {
            await client.connect();
            const db = client.db(dbName);
            const addedItem = await db.collection('nunb').insertOne({num: item, LNUM: lastnum});

            resolve(addedItem.ops[0]);
            client.close();
        } catch (error) {
            reject(error);
        }
    });
}

for(var i = 0; i <= 9999; ++i) {
    console.log(i);
    a += i + " ";
    add(a, i);
}

我在日志中得到了这个：

1
2
3
...
9999
(node:40664) [MONGODB DRIVER] Warning: 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 the MongoClient constructor.
(Use `node --trace-warnings ...` to show where the warning was created)
D:\codde\mongoDB test\node_modules\mongodb\lib\core\topologies\server.js:438
          new MongoNetworkError(
          ^

MongoNetworkError: failed to connect to server [localhost:27017] on first connect [Error: connect ECONNREFUSED 127.0.0.1:27017
    at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1137:16) {
  name: 'MongoNetworkError'
}]
    at Pool.<anonymous> (D:\codde\mongoDB test\node_modules\mongodb\lib\core\topologies\server.js:438:11)
    at Pool.emit (node:events:378:20)
    at D:\codde\mongoDB test\node_modules\mongodb\lib\core\connection\pool.js:562:14
    at D:\codde\mongoDB test\node_modules\mongodb\lib\core\connection\pool.js:995:11
    at D:\codde\mongoDB test\node_modules\mongodb\lib\core\connection\connect.js:32:7
    at callback (D:\codde\mongoDB test\node_modules\mongodb\lib\core\connection\connect.js:280:5)
    at Socket.<anonymous> (D:\codde\mongoDB test\node_modules\mongodb\lib\core\connection\connect.js:310:7)
    at Object.onceWrapper (node:events:485:26)
    at Socket.emit (node:events:378:20)
    at emitErrorNT (node:internal/streams/destroy:188:8)

所以我基本上得到了错误：

D:\codde\mongoDB test\node_modules\mongodb\lib\core\topologies\server.js:438
          new MongoNetworkError(
          ^

MongoNetworkError: failed to connect to server [localhost:27017] on first connect [Error: connect ECONNREFUSED 127.0.0.1:27017
    at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1137:16) {
  name: 'MongoNetworkError'
}]
    at Pool.<anonymous> (D:\codde\mongoDB test\node_modules\mongodb\lib\core\topologies\server.js:438:11)
    at Pool.emit (node:events:378:20)
    at D:\codde\mongoDB test\node_modules\mongodb\lib\core\connection\pool.js:562:14
    at D:\codde\mongoDB test\node_modules\mongodb\lib\core\connection\pool.js:995:11
    at D:\codde\mongoDB test\node_modules\mongodb\lib\core\connection\connect.js:32:7
    at callback (D:\codde\mongoDB test\node_modules\mongodb\lib\core\connection\connect.js:280:5)
    at Socket.<anonymous> (D:\codde\mongoDB test\node_modules\mongodb\lib\core\connection\connect.js:310:7)
    at Object.onceWrapper (node:events:485:26)
    at Socket.emit (node:events:378:20)
    at emitErrorNT (node:internal/streams/destroy:188:8)

有人可以帮我解决问题吗？谢谢:)

首次连接时无法连接到服务器 [localhost:27017] [错误：连接 ECONNREFUSED ---- 在 TCPConnectWrap.afterConnect [as oncomplete]

0 个答案: