Node.js, mongodb and step module integration

nodejs-mongodb-step

/** Use Step to interact with a MongoDB database avoiding too many confusing callbacks, 
    requires: npm install mongodb step
*/
var mongo = require('mongodb'),
    db=new mongo.Db('test', new mongo.Server('localhost', 27017, {}), {}),
    step=require('step'),
    col;

step(
  function open(){
    db.open(this);
  },
  function onOpen(err){
    if (err) throw err;
    db.collection('test1', this);
  },
  function onCollection(err, rv){
    if (err) throw err;
    col=rv;
    col.insert({name:'Record 1 Added via Node and Step', d:new Date()}, this.parallel());
    col.insert({name:'Record 2 Added via Node and Step in parallel', d:new Date()}, this.parallel());
  },
  function onInsert(err){
    if (err) throw err;
    col.find(this);
  },
  function onFind(err, rv){
    if (err) throw err;
    db.close();
  }
);