问题连接节点与 mongodb
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【中文标题】问题连接节点与 mongodb【英文标题】:Issue connecting node with mongodb 【发布时间】:2020-12-01 05:13:37 【问题描述】:我刚开始构建我的第一个 MERN 应用程序,当我尝试连接到 mongoDB 时,我遇到了问题。 这是我的代码:
const express = require("express");
const cors = require("cors");
const mongoose = require("mongoose");
require("dotenv").config();
require("dotenv").config( path: ".env" );
const app = express();
const port = process.env.port || 8000;
app.use(cors());
app.use(express.json());
app.listen(port, () =>
console.log(" Listening on port: ", port);
);
const uri =
"ongodb+srv://username:password@cluster0.p95p7.gcp.mongodb.net/<dbname>?retryWrites=true&w=majority";
mongoose.connect(uri, useNewUrlParser: true, useCreateIndex: true );
const connection = mongoose.connection;
connection.once("open", () =>
console.log("Connected successfully");
);
当我跑步时,这就是我得到的:
Listening on port: 8000
(node:3972) UnhandledPromiseRejectionWarning: MongoParseError: Invalid connection string
at parseConnectionString (f:\Works\Projects\Node\first_mern_app\mern-exercise-tracker\backend\node_modules\mongodb\lib\core\uri_parser.js:547:21)
at connect (f:\Works\Projects\Node\first_mern_app\mern-exercise-tracker\backend\node_modules\mongodb\lib\operations\connect.js:277:3)
at f:\Works\Projects\Node\first_mern_app\mern-exercise-tracker\backend\node_modules\mongodb\lib\mongo_client.js:222:5
at maybePromise (f:\Works\Projects\Node\first_mern_app\mern-exercise-tracker\backend\node_modules\mongodb\lib\utils.js:662:3)
at MongoClient.connect (f:\Works\Projects\Node\first_mern_app\mern-exercise-tracker\backend\node_modules\mongodb\lib\mongo_client.js:218:10)
at f:\Works\Projects\Node\first_mern_app\mern-exercise-tracker\backend\node_modules\mongoose\lib\connection.js:714:12
at new Promise (<anonymous>)
at NativeConnection.Connection.openUri (f:\Works\Projects\Node\first_mern_app\mern-exercise-tracker\backend\node_modules\mongoose\lib\connection.js:711:19)
at Mongoose.connect (f:\Works\Projects\Node\first_mern_app\mern-exercise-tracker\backend\node_modules\mongoose\lib\index.js:335:15)
at Object.<anonymous> (f:\Works\Projects\Node\first_mern_app\mern-exercise-tracker\backend\server.js:19:10)
at Module._compile (internal/modules/cjs/loader.js:956:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:973:10)
at Module.load (internal/modules/cjs/loader.js:812:32)
at Function.Module._load (internal/modules/cjs/loader.js:724:14)
at Function.Module.runMain (internal/modules/cjs/loader.js:1025:10)
at internal/main/run_main_module.js:17:11
(node:3972) 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(). (rejection id: 3)
(node:3972) [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.
我不知道为什么会这样。这与教程中的代码完全相同。请帮忙
【问题讨论】:
我认为您需要用您的实际凭据替换username
、password
<dbname>
,这就是您收到错误的原因,因为没有错误捕获器。也做一个 try catch 块
是的。我将其修改为在这里发布。是的,我也在尝试捕捉它,但那只会返回一个异常,对吧?
【参考方案1】:
在连接字符串中,您错过了第一个字母“m”。这可能是个问题
【讨论】:
【参考方案2】:使用此代码,我希望它有效。
mongoose.connect(`mongodb://$ip:27017/dbname`,
"user": "username",
"pass": "password",
"useNewUrlParser": true,
"useUnifiedTopology": true,
,(err)=>
if(err)
console.log(err)
else
console.log("mongo connected")
);
【讨论】:
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