Mongodb connection with nodejs

Question

How do I connect to the Mongo database with nodejs? I’ve looked at several sites but I’m not getting it right! I thank those who help!

Answer 1

Use the Mongoosis.

Here’s an example of how to open the connection

var mongoose = require('mongoose');
global.db = mongoose.connect('mongodb://localhost:27017/neventos');
mongoose.connection.on('connected', function () {
 console.log('=====Conexão estabelecida com sucesso=====');
});
mongoose.connection.on('error', function (err) {
 console.log('=====Ocorreu um erro: ' + err);
});
mongoose.connection.on('disconnected', function () {
 console.log('=====Conexão finalizada=====');
}); 

In that link has a complete design that I used Mongoose to make the connection.

Answer 2

You can perform as follows:

require('dotenv').config();
const { MongoClient } = require('mongodb');


class MyConnect extends MongoClient {

  constructor(url, options) {
    super(url, options);
    this.client = null;

    this.on('insert-value', this.insertValue)
  }

async insertValue(data) {
    try {
       this.client = await this.connect()

       const collection = this.client.db('testando').collection('olhaai');
       const response = await collection.insertOne(data);

       console.log(response);
       this.client.close();
     } catch (error) {
        console.log(error);
     }
  }
}

(new MyConnect(
    process.env.MONGOURL, 
    { 
        useNewUrlParser: true, 
        useUnifiedTopology: true 
    })
).emit('insert-value', { ola: 'fion', tudo: 'bom'});

Remembering that the Mongocliente class inherits from the Eventemitter class so you can use the:

module.exports = MyConnect;

with this you can use your class office and call the event listeners that are within it with the . Emit('Eventname', options);

good use.

I did the test 4 times, you can manipulate the querys by the event listener, or calling the function itself.