MongoDB and Node.js

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MongoDB + Node.js Buildingfirst app with MongoDB and Node.js

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2 Agenda MongoDB + Node.js Driver ODM's MEANStack Meteor

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3 Ola, I'm Norberto! NorbertoLeite Technical Evangelist Madrid, Spain @nleite norberto@mongodb.com http://www.mongodb.com/norberto

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MongoDB Node.js

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INFACT

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MongoDB JavaScript

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7 Few reasons why FlexibleAgile Web Language

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8 MongoDB + Javascript • MongoDB Shell –  JS interperter •  MongoDB MapReduce –  Runs on top of V8 –  Map and Reduce functions are JS functions •  Native support for Node.js –  One of the most used Drivers out there! –  https://www.npmjs.com/package/mongodb

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Node.js

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10 2 Foundations Events Streams

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11 2 Foundations •  Events/ Event Loop –  Single Thread Applications –  No threads –  Events Emitter –  Event Queue –  Known Events •  Streams –  Read, Write, Both –  Unix Pipes –  We use it extensively!

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Install

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npm package $ npminstall mongodb

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Compatibility http://docs.mongodb.org/ecosystem/drivers/node-js/#compatibility

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15 Compatibility w/ MongoDB

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Initialize Project

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package.json file $ mkdirfirstappnodejs $ cd firstappnodejs $ npm init

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package.json file $ mkdirfirstappnodejs $ cd firstappnodejs $ npm init ... { "name": "firstappnodejs", "version": "0.0.1", "description": "Small demo webinar application", "main": "index.js", "scripts": { "test": "workitout" }, "repository": { "type": "git", "url": "git://github.com/nleite/firstappnodejs" }, "dependencies": { "mongodb": "~2.0" }, "keywords": [http://docs.mongodb.org/ecosystem/drivers/node-js/#compatibility "demo", "nodejs", "mongodb" ], "author": "Norberto Leite", "license": "Apache 2.0", "bugs": { "url": "https://github.com/nleite/firstappnodejs/issues" }, "homepage": "https://github.com/nleite/firstappnodejs"

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package.json file $ mkdirfirstappnodejs $ cd firstappnodejs $ npm init ... { "name": "firstappnodejs", "version": "0.0.1", "description": "Small demo webinar application", "main": "index.js", "scripts": { "test": "workitout" }, "repository": { "type": "git", "url": "git://github.com/nleite/firstappnodejs" }, "dependencies": { "mongodb": "~2.0" }, "keywords": [ "demo", "nodejs", "mongodb" ], "author": "Norberto Leite", "license": "Apache 2.0", "bugs": { "url": "https://github.com/nleite/firstappnodejs/issues" }, "homepage": "https://github.com/nleite/firstappnodejs"

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Install our newfirstappnodejs app! $ npm install > kerberos@0.0.10 install … … > bson@0.3.1 install > mongodb@2.0.28 node_modules/mongodb ├── readable-stream@1.0.31 (isarray@0.0.1, inherits@2.0.1, string_decoder@0.10.31, core-util-is@1.0.1) └── mongodb-core@1.1.25 (kerberos@0.0.10, bson@0.3.1) firstappnodejs/ $ ls node_modules package.json

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Connect

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boot up MongoDBServer $ mkdir ~/firstappdb $ mongod --dbpath ~/firstappdb

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boot up MongoDBServer $ mkdir ~/firstappdb $ mongod --dbpath ~/firstappdb --auth --keyfile ~/n.pem https://www.mongodb.com/products/mongodb-enterprise-advanced

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boot up MongoDBServer $ mkdir ~/firstappdb $ mongod --dbpath ~/firstappdb --auth --keyfile ~/n.pem https://www.mongodb.com/products/mongodb-enterprise-advanced

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var MongoClient =require('mongodb').MongoClient, assert = require('assert'); Connect

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var MongoClient =require('mongodb').MongoClient, assert = require('assert'); //connection uri var uri = "mongodb://localhost:27017/firstapp" Connect

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var MongoClient =require('mongodb').MongoClient, assert = require('assert'); //connection uri var uri = "mongodb://localhost:27017/firstapp" //connect to MongoDB MongoClient.connect(uri, function(err, db){ assert.equal(null, err); console.log("Connected correctly to server"); db.close(); }); Connect

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28 Connection Pooling •  Notraditional Pooling mechanism –  Single thread process •  Sockets to pipeline operations •  Failover –  Buffering up operations –  bufferMaxEntries –  numberOfRetries –  retryMiliSeconds http://mongodb.github.io/node-mongodb-native/2.0/api/Db.html

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CRUD

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var insertDocuments =function(db, cb){ //we don't need to explicitly create a collection var collection = db.collection('myCollection'); collection.insertMany([ {"mongodb": "is just awesome"}, {"nodejs": "so awesome"} ], function(err, result){ assert.equal(null, err); //inserted 2 documents assert.equal(2, result.insertedCount); //invoke callback cb(result); }); } Insert http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#insert

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MongoClient.connect(uri, function(err, db){ assert.equal(null, err); console.log("Sweet! Talking to Server"); insertDocuments(db, function() { db.close(); }); }); Insert http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#insert

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MongoClient.connect(uri, function(err, db){ assert.equal(null, err); console.log("Sweet! Talking to Server"); insertDocuments(db, function() { db.close(); }); }); Insert http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#insert

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var updateDocument =function(db, cb){ var collection = db.collection("myCollection"); collection.updateOne( {"mongodb": "is just awesome"}, {$set: {"users": ["nleite"]}}, function( err, result){ assert.equal(null, err); assert.equal(1, result.modifiedCount); console.log("Cool, just updated"); cb(result); }); } Update http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#update

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MongoClient.connect(uri, function(err, db){ assert.equal(null, err); console.log("Ok, I can now update!"); updateDocuments(db, function() { db.close(); }); }); Update http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#update

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Remove var removeDocument =function(db, cb){ var collection = db.collection("myCollection"); collection.deleteOne( {"users": "nleite"}, function( err, result){ assert.equal(null, err); assert.equal(1, result.deletedCount); console.log("purged the @nleite contaminated data!"); cb(result); }); } http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#remove

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Remove MongoClient.connect(uri, function(err, db){ assert.equal(null, err); console.log("Ok, I can now delete!"); removeDocuments(db, function() { db.close(); }); }); http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#remove

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Find var findAllDocuments =function(db, cb){ var collection = db.collection('myDocuments'); //or collection.find() collection.find({}).toArray(function(err, docs){ assert.equal(err, null); assert.equal(1, docs.length); console.log("Gotcha! found "+ docs.length); console.dir(docs); cb(docs); }); } http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#find

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Flexibility

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Schema Flexibility

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Different Schemas var insertDifferentShapes= function(db, cb){ var doc1 = {"name": "Norberto", "talks": [ {"nodejs":10}, {"java":15}, "python":11]}; var doc2 = {"name": "Bryan", "webinars": 30}; var coll = db.collection("content") coll.insertMany( [doc1, doc2], function(err, result){ assert.equal(err, null); assert.equal(2, result.insertedCount); console.log("Sweet, inserted "+ result.insertedCount); cb(result); }); } http://docs.mongodb.org/manual/data-modeling/

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Different Schemas var insertDifferentShapes= function(db, cb){ var doc1 = {"name": "Norberto", "talks": [ {"nodejs":10}, {"java":15}, "python":11]}; var doc2 = {"name": "Bryan", "webinars": 30}; var coll = db.collection("content") coll.insertMany( [doc1, doc2], function(err, result){ assert.equal(err, null); assert.equal(2, result.insertedCount); console.log("Sweet, inserted "+ result.insertedCount); cb(result); }); } http://docs.mongodb.org/manual/data-modeling/

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WriteConcerns

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WriteConcern w:1

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WriteConcern w:2

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WriteConcern j:true

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Different WriteConcerns var insertSuperImportant= function(db, cb){ var customer = {"name": "Manny Delgado", "age": 14}; var coll = db.collection("customers"); var writeConcern = {"w": "majority"}; col.insertOne( customer, writeConcern, function(err, result){ assert.equal(err, null); assert.equal(1, result.insertedCount); console.log("Inserted super important record"); cb(result); }); } http://mongodb.github.io/node-mongodb-native/2.0/api/WriteConcernError.html

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Different WriteConcerns var insertSuperImportant= function(db, cb){ var customer = {"name": "Manny Delgado", "age": 14}; var coll = db.collection("customers"); var writeConcern = {"w": "majority"}; col.insertOne( customer, writeConcern, function(err, result){ assert.equal(err, null); assert.equal(1, result.insertedCount); console.log("Inserted super important record"); cb(result); }); } http://mongodb.github.io/node-mongodb-native/2.0/api/WriteConcernError.html

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Read Preference

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59 Read Preference •  Readfrom Primary (default) ReadPreference.PRIMARY •  Read from Primary Preferably ReadPreference.PRIMARY_PREFERRED •  Read from Secondary ReadPreference.SECONDARY •  Read from Secondary Preferably ReadPreference.SECONDARY_PREFERRED •  Read from Nearest Node ReadPreference.NEAREST http://mongodb.github.io/node-mongodb-native/2.0/api/ReadPreference.html

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Read From Nearest varreadNearestWaterMelonColor = function(db, cb){ var rp = ReadPreference.NEAREST; var coll = db.collection("products", {ReadPreference:rp}); var query = {"color": "water melon green"}; collection.find(query).toArray(function(err, docs){ assert.equal(err, null); assert.equal(1, docs.length); console.log("So many products: "+ docs.length); console.dir(docs); cb(docs); }); } http://mongodb.github.io/node-mongodb-native/2.0/api/ReadPreference.html

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Read From Nearest varreadNearestWaterMelonColor = function(db, cb){ var rp = ReadPreference.NEAREST; var coll = db.collection("products", {ReadPreference:rp}); var query = {"color": "water melon green"}; collection.find(query).toArray(function(err, docs){ assert.equal(err, null); assert.equal(1, docs.length); console.log("So many products: "+ docs.length); console.dir(docs); cb(docs); }); } http://mongodb.github.io/node-mongodb-native/2.0/api/ReadPreference.html

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Read From Nearest varreadNearestWaterMelonColor = function(db, cb){ var rp = ReadPreference.NEAREST; var coll = db.collection("products", {readPreference:rp}); var query = {"color": "water melon green"}; collection.find(query).toArray(function(err, docs){ assert.equal(err, null); assert.equal(1, docs.length); console.log("So many products: "+ docs.length); console.dir(docs); cb(docs); }); } http://mongodb.github.io/node-mongodb-native/2.0/api/ReadPreference.html

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Aggregation

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Aggregation var aggregateAvgAgeGender =function( db, cb){ //{age:XX, name:"user name", gender: "M/F"} var pipeline = [ {$group: { "_id": "$gender", avg_age: {$avg: "$age"}}}, ]; var coll = db.collection("users"); var cursor = coll.aggregate(pipeline); cursor.forEach( function(x){ console.log("Gender " + x._id + " age average " + x.avg_age) }, function(x) { cb(cursor); }); } http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#aggregate

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Aggregation var aggregateAvgAgeGender =function( db, cb){ //{age:XX, name:"user name", gender: "M/F"} var pipeline = [ {$match:{"age": $gt: 18}}, {$group: { "_id": "$gender", avg_age: {$avg: "$age"}}}, {$project:{"ID": "$_id", "average": "$avg_age" }} ]; var cursor = coll.aggregate(pipeline); var coll = db.collection("users"); cursor.forEach( function(x){ console.log("Gender " + x._id + " age average " + x.avg_age) }, function(x) { cb(cursor); });} http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#aggregate

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ODM's

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Mongoose

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70 Mongoose •  Schema Validation • Casting •  Business Logic Wrapper •  http://mongoosejs.com/

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Simple Mongoose var mongoose= require('mongoose'), assert = require('assert') var Schema = mongoose.Schema; //define a schema var userSchema = new Schema({ name: String, age: Number}) //create static members userSchema.statics.findByName = function( name, cb){ return this.find( {"name": name}, cb); } …

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Simple Mongoose … //generate amodel var User = mongoose.model('User', userSchema); //initiate the new user, validates the given arguments var u1 = User({name:"Many Delgado", age:14}); //just save it u1.save(function(err){ assert.equal(null, err); });

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73 Other Projects Project Repository MongoSkinhttps://github.com/kissjs/node-mongoskin Mongolia https://github.com/masylum/mongolia Mongojs https://github.com/mafintosh/mongojs MongoSmash https://github.com/bengl/mongosmash

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MEAN Stack

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75 MEAN Stack •  MongoDB • Express.js •  Angular JS •  Node.js

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Express is aminimal and flexible Node.js web application framework that provides a robust set of features for web and mobile applications.

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AngularJS lets youextend HTML vocabulary for your application. The resulting environment is extraordinarily expressive, readable, and quick to develop

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Building your firstapp with MongoDB: Creating a RESTAPI using the MEAN Stack https://www.mongodb.com/blog/post/building- your-first-application-mongodb-creating-restapi-using-mean-stack-part-1

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Meteor

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Meteor is acomplete open source platform for building web and mobile apps in pure JavaScript.

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81 Meteor •  Responsiveness •  Reactiveness • Multiplatform •  Unified Package System •  Hot Deploys https://www.meteor.com/try

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METEOR: Build IOSandAndroidApps that are a delight to use http://www.mongodb.com/blog/post/meteor- build-ios-and-android-apps-are-delight-use

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Recap

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84 What we talkedabout today… •  Node.js is a very productive language –  Our driver is highly adopted –  Updated –  Fully compatible •  CRUD Operations –  Insert, Update, Remove, Delete •  Write Concerns –  Flexible to write •  Read Preferences –  Flexible to read •  Aggregation Framework –  Analytics at your fingertips

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85 Large Ecosystem •  Mongoose • Mean Stack •  Meteor •  Many other projects

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86 Where to next? • Questions on the driver: –  https://groups.google.com/forum/#!forum/node-mongodb-native •  Issues: –  https://jira.mongodb.org/browse/NODE/? selectedTab=com.atlassian.jira.jira-projects-plugin:summary- panel •  Tutorial: –  http://mongodb.github.io/node-mongodb-native/2.0/ •  Todays code: –  https://github.com/nleite/firstappnodejs •  Other: –  http://www.mongodb.com/norberto

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87 For More Information ResourceLocation Case Studies mongodb.com/customers Presentations mongodb.com/presentations Free Online Training education.mongodb.com Webinars and Events mongodb.com/events Documentation docs.mongodb.org MongoDB Downloads mongodb.com/download Additional Info info@mongodb.com Blog blog.mongodb.com

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88 Register now: mongodbworld.com! ! UseCode NorbertoLeite for additional 25% Off! *Come as a group of 3 or more – Save another 25%!

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http://cl.jroo.me/z3/v/D/C/e/a.baa-Too-many-bicycles-on-the-van.jpg Questions? @nleite norberto@mongodb.com http://www.mongodb.com/norberto

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