'use strict'

const MongoClient = require('mongodb').MongoClient
const url = 'mongodb://localhost:27017/test';
var count = 0
var max = 1000

MongoClient.connect(url, function(err, db) {
  if (err) { throw err }
  const collection = db.collection('data')

  function insert (err) {
    if (err) throw err

    if (count++ === max) {
      return db.close()
    }

    collection.insert({
      value: Math.random() * 1000000
    }, insert)
  }

  insert()
})