Neo4j confoo

ENOOOUUGGHH OFTHIS NOSQL BLA BLA BLA!

I Can’t....

get enough!

The power of Neo4j And graphs!

Who the hell are you?

Who the hell are you?• Hi!

Who the hell are you?• Hi!• Hanneli

Who the hell are you?• Hi!• Hanneli• a.k.a @hannelita

Who the hell are you?• Hi!• Hanneli• a.k.a @hannelita• Coding addicted

Who the hell are you?• Hi!• Hanneli• a.k.a @hannelita• Coding addicted• Computer Engineer

Who the hell are you?

Who the hell are you?• She is from Brazil

Who the hell are you?• She is from Brazil• Has a horrible accent when speaking English

Who the hell are you?• She is from Brazil• Has a horrible accent when speaking English• Works with nice people at @caelum

Who the hell are you?• She is from Brazil• Has a horrible accent when speaking English• Works with nice people at @caelum My boss

ok, enough of stories

story?Let me tell you another story

story?Let me tell you another story OWWN

There was a guy

Studying Computer Science

During data structures classes

During data structures classes Expected

During data structures classes Reality Expected

Data StructuresTree List Stack Hashes

During graphs theory classes

During graphs theory classes Expected

During graphs theory classes Reality Expected

I learned lots of things

During databases classesReality Expected

Professor

Students Professor

Ok, guys, let’s store data.Students Professor

Students Professor

Can anyone tell me which structure we use for storing data?Students Professor

I know everything about data structures! I can answer that!

May I try,professor?

Hashes!

Trees!

Lists!

The student

Go back to high school.

We store data into tables.

WHYYYYYYY??? Data structureclasses are useless

The relational modelSince 70’s it makes you happy storing your data

• Normalization• Table• Relationship tables• PK, FK• ACID• bla bla bla

So tables areperfect! Now I see!

So, the student came to work at Caelum as an intern

Caelum online

Be social while you learn

We must storesome data into our system

Store data...Tables! SQL! Relational databases!

I’ll be able to use everything I learned atgraduation course!

Let’s do some data modeling Did the Is able to Is doing theStudent courses in write code courses the past in VRaptor, Java, Ruby,Hanneli Git SQL Python, C VRaptor, Simon Ruby Java, Ruby SQL Anna SQL, Ruby - Java, C Ruby, Python, Diego SQL Ruby PHP

Now let’s do some[awesome] queries

Boss wanna know all thestudents who did the samecourse that Hanneli is doing

Boss wanna know all thestudents who did the samecourse that Hanneli is doing (my boss)

Boss wanna know all thestudents who did the samecourse that Hanneli is doing

Boss wanna know all thestudents who did the samecourse that Hanneli is doing Serious guy

Ok, got it.

joins, subselects

Wanna know all thestudents who did the same course that Hanneli is doing or already did

poor you

How can I do this?

joins, subselects. More difﬁcult this time

What if you have tocreate more queries like that?

Not fun.

It was difﬁcult. Why?

I though tableswould always save my life!

Is not over yet.

This is a fast query.

This is a fast query. NOT

It was difﬁcult. Why?

Let’s take a look at the situation

Consider some students

Consider some studentsHanneli

Consider some studentsHanneli Simon

Consider some studentsHanneli Simon Anna

Consider some studentsHanneli Simon Anna Diego

Consider some studentsHanneli Simon Anna Diego OMG, a cow!

Hanneli Simon Anna Diego

Is doing the course Hanneli Simon Anna Diego

Is doing the course Git Hanneli Simon Anna Diego

Is doing the course Git VRaptor Hanneli Simon Anna Diego

Is doing the course Git VRaptor SQL Hanneli Simon Anna Diego

Is doing the course Git VRaptor SQL Ruby Hanneli Simon Anna Diego

Is doing the course Git VRaptor SQL Ruby Hanneli Simon Anna DiegoDid the courses in the past

Is doing the course Git VRaptor SQL Ruby Hanneli Simon Anna Diego GitDid the courses in the past

Is doing the course Git VRaptor SQL Ruby Hanneli Simon Anna Diego Git VRaptorDid the courses in the past

Is doing the course Git VRaptor SQL Ruby Hanneli Simon Anna Diego Git VRaptor SQLDid the courses in the past

Is doing the course Git VRaptor SQL Ruby Hanneli Simon Anna Diego Git VRaptor SQL RubyDid the courses in the past

Does it look like a table?

It’s a graph

Why you can’t storedata into... graphs?

a. Because Databaseadmin just knowtables;

b. Because teachertold me to usetables

c. Because_____

Let us store data into...

Let us store data into... GRAPHS

Ladies and Gentleman

How does it work?

Hanneli

GitHanneli

GitHanneli SQL

GitIs doing the course Hanneli SQL

Git Is doing the course HanneliDid the courses in the past SQL

Git Node Is doing the course HanneliDid the courses in the past SQL

Git Node Is doing the course Hanneli Did the courses in the past SQLRelationship

Is doing the course Git VRaptor SQL Ruby Hanneli Simon Anna Diego Git VRaptor SQL RubyDid the courses in the past

Traversal

Just look at the arrows

Ok, it’s beautiful. How can I use that?

Back to our story

Remember our intern?

List all the studentswho are able to code in the same languages as Hanneli

Did the Is able to Is doing theStudent courses in write code courses the past in VRaptor, Java, Ruby,Hanneli Git SQL Python, C VRaptor,Simon Ruby Java, Ruby SQL Anna SQL, Ruby - Java, C Ruby, Python,Diego SQL Ruby PHP

Create a new application.

Ok, got it. I’m goingto use Neo4j and Java.

You must use Rails.

RailsRubyNeo4j

RailsRubyNeo4java

Neo4j + Ruby == ?

Neo4j + Ruby == ?JRuby

Neo4j + Ruby == ? JRuby (more info, contact thisguy; he is around here at Confoo)

show me the code

rails new yourProject -m http:// andreasronge.github.com/rails3.rb

Create a node

Traversal!

class Student < Neo4j::Rails::Modelend

class Student < Neo4j::Rails::Model property :nameend

class Student < Neo4j::Rails::Model property :name has_n(:is_doing_the_courses).to(Cou rse).relationship(Coursing)end

class Course < Neo4j::Rails::Model property :name has_n(:students).from(Student, :is_doing_the_courses) has_n(:students).from(Student, :past_courses)end

Lessons learned

Polyglot persistence!

References and help• neo4j.org• neo4j.rubyforge.org• Twitter - @neo4j• Mailing lists - Neo4j and Neo4j.rb

Thanks!• hannelita@gmail.com - Gtalk• @hannelita• http://hannelita.wordpress.com

Neo4j confoo

by Hanneli Tavante

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