Keeping open a MongoDB database connection

Question

In so many introductory examples of using MongoDB, you see code like this:

var MongoClient = require(\'mongodb\').MongoClient;
MongoClient.connect(\"mongodb:         


        

Answer 1

mongodb version ^3.1.8

Initialize the connection as a promise:

const MongoClient = require('mongodb').MongoClient
const uri = 'mongodb://...'
const client = new MongoClient(uri)
const connection = client.connect() // initialized connection

And then call the connection whenever you wish you perform an action on the database:

    // if I want to insert into the database...
    const connect = connection
    connect.then(() => {
        const doc = { id: 3 }
        const db = client.db('database_name')
        const coll = db.collection('collection_name')
        coll.insertOne(doc, (err, result) => {
            if(err) throw err
        })
    })