Getting started with MongoDB and Scala - Open Source Bridge 2012
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This document provides an overview of using MongoDB and Scala together. It discusses MongoDB concepts and how they compare to relational databases. It also covers several Scala driver and ORM options for MongoDB, including Casbah, Morphia, and Hammersmith. Examples are provided for installing and using MongoDB from the command line and connecting to it from Scala code using Casbah.
// a is an Option[String]
http://api.mongodb.org/scala/casbah/current/tutorial.html](https://image.slidesharecdn.com/mongodb-and-scala-osbridge-2012-final-120703022301-phpapp02/85/Getting-started-with-MongoDB-and-Scala-Open-Source-Bridge-2012-44-320.jpg)
![Casbah MongoDBList
// MongoDBList is a Mongo-friendly Scala List
import org.mongodb.casbah.Imports._
val builder = MongoDBList.newBuilder
builder += "foo"
builder += "bar"
builder += "x"
builder += "y"
val newLst = builder.result
/* newLst: com.mongodb.BasicDBList = [ "foo" ,
"bar" , "x" , "y"] */
http://api.mongodb.org/scala/casbah/current/tutorial.html](https://image.slidesharecdn.com/mongodb-and-scala-osbridge-2012-final-120703022301-phpapp02/85/Getting-started-with-MongoDB-and-Scala-Open-Source-Bridge-2012-45-320.jpg)
![Querying with Casbah
val mongoColl = MongoConnection()("test_db")("users")
val user1 = MongoDBObject("user" -> "barack",
"email" -> "barack@whitehouse.gov")
val user2 = MongoDBObject("user" -> "someOtherUser")
mongoColl += user1
mongoColl += user2
mongoColl.find()
// com.mongodb.casbah.MongoCursor =
// MongoCursor{Iterator[DBObject] with 2 objects.}
for { x <- mongoColl} yield x
/* Iterable[com.mongodb.DBObject] = List(
{ "_id" : { "$oid" : "4c3e2bec521142c87cc10faa"} ,
"user" : "obama" ,
"email" : "barack@whitehouse.gov"},
{ "_id" : { "$oid" : "4c3e2bec521142c87dc10fbb"} ,
"user" : "someOtherUser"}
) */
http://api.mongodb.org/scala/casbah/current/tutorial.html](https://image.slidesharecdn.com/mongodb-and-scala-osbridge-2012-final-120703022301-phpapp02/85/Getting-started-with-MongoDB-and-Scala-Open-Source-Bridge-2012-46-320.jpg)
![âFongo is an in-memory java implementation of mongo.â
â[...] primary use is for lightweight unit testing where you
don't want to spin up a mongo processâ](https://image.slidesharecdn.com/mongodb-and-scala-osbridge-2012-final-120703022301-phpapp02/85/Getting-started-with-MongoDB-and-Scala-Open-Source-Bridge-2012-54-320.jpg)
Getting started with MongoDB and Scala - Open Source Bridge 2012
- 1. Getting started with MongoDB and Scala Open Source Bridge June 27, 2012 Sean Sullivan
- 3. Gilt Groupe
- 7. Jobs @ Gilt Portland âą QA engineering âą Backend engineering âą Frontend engineering #scala #java #ruby #html5 #javascript
- 8. open source @ Gilt
- 11. âą MongoDB âą Using Mongo and Scala together âą MongoDB at Gilt
- 12. âMongoDB is a document-oriented database management system designed for performance, horizontal scalability, high availability, and advanced queryabilityâ source: http://docs.mongodb.org/manual/about/
- 15. Licensing Database: GNU AGPL v3.0 Drivers: Apache License 2.0 source: http://www.mongodb.org/display/DOCS/Licensing
- 16. Getting started
- 19. MongoDB concepts
- 20. MySQL MongoDB database database table collection index index row BSON document column BSON ïŹeld join embedding and linking primary key _id ïŹeld group by aggregation source: mongodb.org
- 22. Embedding vs Linking âEmbedding is the nesting of objects and arrays inside a BSON documentâ âLinks are references between documentsâ source: http://www.mongodb.org/display/DOCS/Schema+Design
- 23. MongoDB on MacOS X $ wget http://downloads.mongodb.org/osx/mongodb-osx-x86_64-2.0.6.tgz $ tar -zxvf mongodb-osx-x86_64-2.0.6.tgz $ sudo mkdir -p /data/db $ sudo chown `id -u` /data/db
- 26. Mongo shell demo
- 27. Mongo shell > use mydb > obama = { name: âObamaâ }; > db.presidents.save(obama); > db.presidents.ensureIndex({ name: 1 }); > db.presidents.ïŹnd({name: âObamaâ}); > exit
- 28. Client libraries for the JVM
- 29. âą mongo-java-driver âą Casbah âą Morphia âą Hammersmith âą Rogue
- 32. mongo-java-driver and Maven <dependency> <groupId>org.mongodb<groupId> <artifactId>mongo-java-driver<artifactId> <version>2.8.0<version> <dependency>
- 34. Morphia
- 37. Casbah
- 39. Casbah âą Scala toolkit for MongoDB âą built on top of the mongo-java-driver
- 40. Casbah âą Scala idioms âą Scala collections âą ïŹuid query syntax
- 42. Casbah and Maven <dependency> <groupId>org.mongodb<groupId> <artifactId>casbah_2.9.2<artifactId> <version>2.3.0<version> <dependency>
- 43. Casbah and SBT "org.mongodb" %% "casbah" % "2.3.0"
- 44. Casbah DBObject import org.mongodb.casbah.Imports._ val mongoConn = MongoConnection(hostname, port) val mongoDB = mongoConn(âtest_dbâ) val collection = mongoDB(âtest_dataâ) val newObj = MongoDBObject(âaâ -> âappleâ, âbâ -> âbananaâ) newObj += âcâ -> âchocolateâ val a = newObject.getAs[String](âaâ) // a is an Option[String] http://api.mongodb.org/scala/casbah/current/tutorial.html
- 45. Casbah MongoDBList // MongoDBList is a Mongo-friendly Scala List import org.mongodb.casbah.Imports._ val builder = MongoDBList.newBuilder builder += "foo" builder += "bar" builder += "x" builder += "y" val newLst = builder.result /* newLst: com.mongodb.BasicDBList = [ "foo" , "bar" , "x" , "y"] */ http://api.mongodb.org/scala/casbah/current/tutorial.html
- 46. Querying with Casbah val mongoColl = MongoConnection()("test_db")("users") val user1 = MongoDBObject("user" -> "barack", "email" -> "[email protected]") val user2 = MongoDBObject("user" -> "someOtherUser") mongoColl += user1 mongoColl += user2 mongoColl.find() // com.mongodb.casbah.MongoCursor = // MongoCursor{Iterator[DBObject] with 2 objects.} for { x <- mongoColl} yield x /* Iterable[com.mongodb.DBObject] = List( { "_id" : { "$oid" : "4c3e2bec521142c87cc10faa"} , "user" : "obama" , "email" : "[email protected]"}, { "_id" : { "$oid" : "4c3e2bec521142c87dc10fbb"} , "user" : "someOtherUser"} ) */ http://api.mongodb.org/scala/casbah/current/tutorial.html
- 47. Fluid querying with Casbah DSL val q = "email" $exists true // q: (String, com.mongodb.DBObject) = // (email,{ "$exists" : true}) val users = for (x <- mongoColl.find(q)) yield x assert(users.size == 1) http://api.mongodb.org/scala/casbah/current/tutorial.html
- 48. Hammersmith
- 50. Hammersmith âą new MongoDB driver for Scala âą pure Scala âą Asynchronous âą Not production ready at this time
- 51. MongoDB at Gilt
- 52. âą feature conïŹguration service âą global navigation service âą user service
- 54. âFongo is an in-memory java implementation of mongo.â â[...] primary use is for lightweight unit testing where you don't want to spin up a mongo processâ
- 56. Additional resources âą http://www.10gen.com/presentations âą http://www.mongodb.org âą http://www.slideshare.net/sullis
- 57. Questions?
- 58. THE END