Question

我尝试使用node js进行crud操作，并且mongodb.crud操作可以正常工作。但是，我尝试在post man工具中运行。首先，我尝试获取请求传递以成功地发布post man工具数据。传递另一个请求

的抛出错误

MongoError：拓扑已被破坏。

如何解决此错误。

index.js

var express = require('express')
var MongoClient = require('mongodb').MongoClient;
var body_parser = require('body-parser')
const product = require('./routes/product.js')


var app = express()

app.use(body_parser.json())
app.use('/get', product);
app.use('/insert',product)




const port = process.env.PORT || 3000;
app.listen(port, () => console.log(`Listening on port ${port}...`));

routes / product.js

var express = require('express')
var validate = require('../models/product.js')
const CircularJSON = require('circular-json');
const router = express.Router();
const MongoClient = require('mongodb').MongoClient;
const assert = require('assert');
var util = require('util')
var ObjectId = require('mongodb').ObjectID// Connection URL
const url = 'mongodb://localhost:27017';



const client = new MongoClient(url, { useNewUrlParser: true });


//Get Data from Database
router.get('/', async (req, res,next) => {
  try {
    await client.connect();
    const db = client.db('olc_prod_db');
    const r = await db.collection('Ecommerce').find().toArray();
    client.close();
    res.send(r)
  } catch(err) {
    console.log(err.stack);
  }

  });


  //Insert Data from Database
  router.post('/', async (req, res) => {
    try {
      await client.connect();
      console.log("Connected correctly to server");
      const db = client.db('olc_prod_db');
      const { error } = validate.validate(req.body);
      if (error)
      {
        return res.status(400).send(error.details[0].message);
      }
      else
      {
        let r = await db.collection('Ecommerce').insertOne(req.body);
        assert.equal(1, r.insertedCount);
        res.send("Inserted Sucessfully") 
      }
      client.close();
    } catch(err) {
      console.log(err.stack);
    }

  });

  //Get Particular Data from Database
  router.get('/:id', async (req, res) => {
    try {
      await client.connect();
      console.log("Connected correctly to server");
      const db = client.db('olc_prod_db');
      let r = await db.collection('Ecommerce').find({ _id:new ObjectId(req.params.id)}).toArray();
      res.send(r)
      client.close();
    } catch(err) {
      console.log(err.stack);
    }

  });

  //Update Data from Database
  router.put('/:id', async (req, res) => {
    try {
      await client.connect();
      const db = client.db('olc_prod_db');
      const { error } = validate.validate(req.body);
      if (error)
      {
        return res.status(400).send(error.details[0].message);
      }
      else
      {
        let r = await db.collection('Ecommerce').updateOne({_id:new ObjectId(req.params.id)},{ $set: req.body});
        res.send("Updated Sucessfully")
      }
      client.close();
    } catch(err) {
      console.log(err.stack);
    }

  });


  //Delete Data from Database
  router.delete('/:id', async (req, res) => {
    try {
      await client.connect();
      const db = client.db('olc_prod_db');
      let r = await db.collection('Ecommerce').deleteOne({_id:new ObjectId(req.params.id)});
      res.send("Deleted Sucessfully")
      client.close();
    } catch(err) {
      console.log(err.stack);
    }

  });

  module.exports = router;

如何解决此MongoError：使用node_js和mongodb

0 个答案: