无法与 Mongoose (Mongodb) 连接

Posted 2023-03-11

【中文标题】无法与 Mongoose (Mongodb) 连接

【英文标题】：Unable to connect with Mongoose (Mongodb)

【发布时间】：2020-06-07 05:42:33

【问题描述】：

const express=require('express');
const mongoose=require('mongoose');
const morgan=require('morgan');
const path=require('path');


const app = express();
const PORT = process.env.PORT || 8080;


mongoose.connect('mongodb://localhost/SUCCESS', 
    useNewUrlParser: true,
    useUnifiedTopology: true
);

mongoose.connection.on('connected', () => 
    console.log('Mongoose is connected');


)

//HTTP request logger
app.use(morgan('tiny'));

//Routes
app.get('/', (req, res) => 
const data = 
    username: 'caa',
    age: 5
;
res.json(data);

);

app.get('/api/name', (req, res) => 
const data = 
    username: 'caa',
    age: 5
;
res.json(data);

);

app.listen(PORT, console.log(`Server is starting at $PORT`));

---

node pages/server.js
Server is starting at 8080
(node:6253) UnhandledPromiseRejectionWarning: MongooseServerSelectionError: connect ECONNREFUSED 127.0.0.1:27017
    at new MongooseServerSelectionError (/Users/Abc/Desktop/success/node_modules/mongoose/lib/error/serverSelection.js:22:11)
    at NativeConnection.Connection.openUri (/Users/Abc/Desktop/success/node_modules/mongoose/lib/connection.js:808:32)
    at Mongoose.connect (/Users/Abc/Desktop/success/node_modules/mongoose/lib/index.js:333:15)
    at Object.<anonymous> (/Users/Abc/Desktop/success/pages/server.js:18:10)
    at Module._compile (internal/modules/cjs/loader.js:1158:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1178:10)
    at Module.load (internal/modules/cjs/loader.js:1002:32)
    at Function.Module._load (internal/modules/cjs/loader.js:901:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:74:12)
    at internal/main/run_main_module.js:18:47
(node:6253) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:6253) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

【问题讨论】：

是网络或服务相关问题，可能是MongoDB服务造成的，请检查是否在运行。如果它仍然存在，请指定正在运行的操作系统以获取更多详细信息。

如何检查？ @KamNadimi

你运行的操作系统是什么？

MACOS @KamNadimi

在你的终端试试这个mongod

【参考方案1】：

我知道我迟到了，但这应该可以解决它。

const db = mongoose.connect("mongodb://localhost/swag-shop", 
    
    useUnifiedTopology: true,
    useNewUrlParser: true,
    useCreateIndex: true,
    ).then(() => 
    console.log("Connected To Mongo Db DataBase");
    ).catch((err) => 
    console.log("DataBase Connection Error " + err);
    );

然后在 windows 中的 powershell 或 mac 的终端中输入“Mongod”，然后在终端中创建另一个选项卡或打开另一个 powershell 窗口，然后输入“Mongo”，这应该可以解决您的问题。

【参考方案2】：

我有同样的问题。请像这样更新您的代码。

mongoose.connect("mongodb://127.0.0.1:27017/SUCCESS",
        useCreateIndex:true,
        useNewUrlParser: true,
        useUnifiedTopology: true).then(()=> 
console.log('Database Successfully Connected'),error =>
console.log(error))

下一步，

转到您的任务管理器 服务 启动“MongoDB”

希望这会奏效。

【参考方案3】：

//好像你没有定义mangoose的默认端口，请参考下面的代码

const mongoose = require('mongoose');
const db = "mongodb://localhost:27017/SUCCESS";

mongoose.connect(db, 
        useCreateIndex:true,
        useUnifiedTopology:true,
        useNewUrlParser:true
    ).then( () => 
          console.log("Connected To Mongo Db DataBase");
      ).catch((err) => 
        console.log("DataBase Connection Error " + err);
    )

【讨论】：

我收到此错误：DataBase Connection Error MongooseServerSelectionError: connect ECONNREFUSED 127.0.0.1:27017