benzenwen

db.collection('quests', function(er, cl) {
    cl.insert({'goal': 'Explore', 'lv': 1}, {safe: true}, function(er,rs) {
	cl.update({'goal': 'Explore'},
		  {'$set': {'gold': 150}}, {safe: true}, function(er,rs) {
		      cl.find({'lv': {'$lte': 4}}).toArray(function (er,rs) {
			  console.log(rs);
		      }); }); }); });

benzenwen

var mongo = require('mongodb');
var mongoUri = 'mongodb://localhost:27017/mongoquest';
mongo.Db.connect(mongoUri, function (err, db) {
    /* adventure! */
});

benzenwen

// make sure we're using the right db; this is the same as "use aggdb;" in shell
db = db.getSiblingDB("aggdb");

// simple projection
var p1 = db.runCommand(
{ aggregate : "article", pipeline : [
    { $project : {
	tags : 1,
	pageViews : 1
    }}