How different are MongoDB Drivers? SA, MongoDB Norberto Leite #mongobe 

{ "name": "Norberto Leite", "role": "Solutions Architect", "company": "MongoDB", "address": ["Barcelona, Spain”, ”Brussels, Belgium”] "contact": "[email protected]", "likes": { "beer": "Superbock", "software": ["Development", "python", "go", "databases"], "football": "FC Porto" } } Hi There! 

Agenda •  MongoDB Drivers •  Community vs Official Supported •  General Considerations •  Examples •  Meta Driver Project 

MongoDB Drivers 

What’s a Driver? •  Native Language Library •  API that exposes methods to operate w/ MongoDB •  Serialization and Deserialization of native objects/ structures into BSON format –  http://bsonspec.org •  Handles the communication and pooling with server 

struct MsgHeader { int32 messageLength; // total message size, including this int32 requestID; // identifier for this message int32 responseTo; // requestID from the original request // (used in reponses from db) int32 opCode; // request type - see table below } Driver Messages 

struct OP_INSERT { MsgHeader header; // standard message header int32 flags; // bit vector - see below cstring fullCollectionName; // "dbname.collectionname" document* documents; // one or more documents to insert into the collection } Insert Message 

struct OP_QUERY { MsgHeader header; // standard message header int32 flags; // bit vector of query options. See below for det cstring fullCollectionName ; // "dbname.collectionname" int32 numberToSkip; // number of documents to skip int32 numberToReturn; // number of documents to return // in the first OP_REPLY batch document query; // query object. See below for details. [ document returnFieldsSelector; ] // Optional. Selector indicating the fiel // to return. See below for details. } Query Message 

How many drivers ? •  A few 

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How many drivers? •  13 officially supported drivers –  Python –  Java –  C / C++ / C# –  PHP –  Node.js –  Perl –  Ruby –  Scala –  … http://docs.mongodb.org/ecosystem/drivers/ 

How many drivers? •  Community Supported –  Matlab –  R –  Go –  Clojure –  Dart –  Erlang –  Prolog –  … http://docs.mongodb.org/ecosystem/drivers/community-supported-drivers/ 

Community vs Official Supported 

Don’t take the RED PILL! 

Things to consider •  Official driver means: –  We have dedicated resources to work on the driver –  Constant delivery and updated with server version –  Support includes fixes for drivers •  Some community drivers are also maintained by MongoDB engineers –  mongoengine –  motor –  … 

But most important Use the best tool for the problem! 

Language Ecosystem 

Python •  Official Driver –  pymongo •  Frameworks | ODMs –  mongoengine –  minimongo –  Manga •  Alternative Drivers –  Asynchronous •  Motor •  TxMongo 

> pip install pymongo //or > easy_install pymongo //using ipython > ipython >> from pymongo import MongoClient >> mc = MongoClient() Python 

Node.js •  Official Driver –  http://mongodb.github.io/node-mongodb-native/ •  ODM –  Mongose •  http://mongoosejs.com/ •  Others –  Mongoskin –  Mongolia http://docs.mongodb.org/ecosystem/drivers/node-js/ 

> node >> var MongoClient = require("mongodb").MongoClient >> MongoClient.connect( "mongodb://nair.local:27017", function(err, db){ if(!err) {console.log("we are connected");} }); >> var col = db.collection("sample"); Node.js 

Java •  Official Driver –  http://api.mongodb.org/java/current/index.html •  Multiple Frameworks –  Morphya –  DataNucleus JPA/JDO –  Jongo •  JVM Languages –  Scala –  Clojure –  Groovy 

Clojure 

(ns my.service.server (:require [monger.core :as mg]) (:import [com.mongodb MongoOptions ServerAddress])) ;; localhost, default port (mg/connect!) ;; set default database using set-db (mg/set-db! (mg/get-db "monger-test")) Clojure 

Go •  Not officially supported driver! •  mgo Library –  http://labix.org/mgo –  Really cool! –  We use it internally for some projects •  Others –  gomongo –  go-mongo 

Let’s get some code Running! 

MongoDB Meta Driver Project 

Meta Driver •  http://docs.mongodb.org/meta-driver/latest/ •  Help new drivers to be built by the community •  Basic structure and conventions documentation •  Beta Project – Under Development 

Obrigado! [email protected] Norberto Leite @nleite