你如何使用mongodb native，express和body-parser发布请求并保存数据？
[英]How do you use mongodb native, express and body-parser to post request and save data?
问题描述
I have been trying to save data to a mongodb database but nothing I do seems to work. 
我一直在尝试将数据保存到mongodb数据库，但我做的一切似乎都没有用。 the first error i'm getting is related to the req.body 我得到的第一个错误与req.body
When I click the submit button, console.log(req.body) returns 当我单击提交按钮时， console.log(req.body)返回
[Object: null prototype] { name: 'John', priority: 'go to bed' }
rather than 而不是
{ name: 'John', priority: 'go to bed' }
Secondly, I don't know if I'm saving the data to the database correctly because I have seen so many different ways of doing it that I'm confused 其次，我不知道我是否正确地将数据保存到数据库中，因为我已经看到了很多不同的方法，我很困惑
The relevant line of code 相关的代码行
db.collection.insertOne(req.body);
and relevant error: 和相关的错误：
TypeError: db.createCollection is not a function
const express = require('express'); const app = express(); const bodyParser = require('body-parser'); var urlencodedParser = bodyParser.urlencoded({ extended: false }); const MongoClient = require('mongodb').MongoClient; // Connection URL const url = "mongodb://localhost:27017"; app.listen(7000); app.get('/', function(req, res){ res.sendFile(__dirname + '/index.html'); }) app.post('/todo',urlencodedParser,function(req, res){ MongoClient.connect(url, { useNewUrlParser: true }, function(err,db){ if(err) throw err; console.log('Databese created!'); db.collection.insertOne(req.body); db.close(); }); console.log(req.body); });
<!DOCTYPE html> <html lang="en" dir="ltr"> <head> <meta charset="utf-8"> <title></title> </head> <body> I am an index page. <form class="" action="/todo" method="post"> <input type="text" name="name" placeholder="todo"> <input type="text" name="priority" placeholder="priority"> <button type="submit">Submit</button> </form> </body> </html>
2 个解决方案
解决方案1
2 已采纳 2019-02-13 10:21:46
Regarding first error , You should add this two line to get json data as a request object because you're sending data in json 关于第一个错误 ，你应该添加这两行来获取json数据作为请求对象，因为你在json中发送数据
app.use(bodyParser.urlencoded({extended:true}))
app.use(bodyParser.json())
Regarding second query: Inserting record in mongoDB 关于第二个查询：在mongoDB中插入记录
MongoClient.connect(url, function(err, db) {
if (err) throw err;
var dbo = db.db("mydb");
var myobj = { name: "Company Inc", address: "Highway 37" };
dbo.collection("customers").insertOne(myobj, function(err, res) {
if (err) throw err;
console.log("1 document inserted");
db.close();
});
});
解决方案2
1 2019-02-13 10:11:38
Your problem is that you don't specify to your MongoDB Instance which database you are using. 您的问题是您没有为MongoDB实例指定您正在使用的数据库。
const url = "mongodb://localhost:27017/myDataBaseName";
This should solve this out for you. 这应该为你解决这个问题。
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