Intro to Spring Data Neo4j

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Spring Data Neo4j 2.1
Introduction

Michael Hunger, Neo Technology

Me & You ?

๏ Me: Michael Hunger, Neo Technology
• Neo4j Community Team
• Spring Data Neo4j Project Lead
• N...

About the Webinar

๏ Graphs are EveryWhere
๏ Graph Database
๏ Intro Neo4j
๏ Sample App - Twitter Graph
• Domain Mo...

To become part of todays
Twitter-Graph

To become part of todays
Twitter-Graph
please tweet with #neo4j #sdn

To become part of todays
Twitter-Graph
please tweet with #neo4j #sdn
•your attendance
•questions...

Graphs are
everywhere

5

7
6

Science

7
6

Science

Biology

Chemistry

7
6

Science

Biology

Chemistry
Proteins
Reactions
Environments
7
...

Science

Biology

Chemistry
Proteins
...

Science

Biology
Work
Friends
Neighbor
Family ...

Computers

Internet

Science

...

Devices
Users
Software
Networks
...

Devices
Users
Software
Networks
...

Devices
Users
Software
Networks
...

Devices
Users
Software
Networks
...

Devices Stories
Users
...

A Graph Database

Node Node

A Graph Database

Typed relationship
Node Node

A Graph Database

Typed relationship
Node Node
key: value ...

Neo4j Intro

Java

N
D _I
N TE
E ME
PL...

Java

N
D _I
N ...

Java

N
D _I
N ...

Java

N
D _I
N ...

Java Lucene

N
D _I
...

Java Lucene

N
D _I
...

Java Lucene

1 M/s

...

Java Lucene

1 M/s

Master/

...

Java Lucene

1 M/s

Master/

...

Introducing
The Twitter-Graph
Domain Model

Whiteboard it - abstract

:Tweet

:Tweet

Whiteboard it - abstract

:User

PO
ST
ED

...

Whiteboard it - abstract

:User

PO
ST
ED

...

Whiteboard it - abstract

:User

PO
ST
ED

...

Whiteboard friendly - example

Attending the
#SDN #Neo4j
webinar by
@mesiri...

Whiteboard friendly - example

@peterneubauer

PO
ST
ED

Attending t...

Whiteboard friendly - example

@peterneubauer

PO
ST
ED

...

Whiteboard friendly - example

@peterneubauer

PO
ST
ED

...

Cypher Query Language
๏ Declarative query language
• Describe what you want, not how
• Based on pattern matching
๏ E...

Spring Data Neo4j 2.1

Spring Data

๏ Spring Data: VMWare/SpringSource initiative to give Spring
developers easy access to the emerging worl...

Spring Data Neo4j

๏ The brain child of Rod Johnson & Emil Eifrém
• Wrote functional initial prototype
• Develope...

Classic Neo4j domain class

public class Tag {
private final Node underlyingNode;

Tag( final Node node ) {
...

Spring Data Neo4j domain class

@NodeEntity
public class Tag {
@GraphId private Long id;

private String tag;
}

Spring Data Neo4j domain class

@NodeEntity
public class Tag {
@GraphId private Long id;
@Indexed(unique = true)
...

Defining entity classes

Defining entity classes

• @NodeEntity
• Represents a node in the graph
• Fields saved as properties on node
•...

Defining entity classes

Defining entity classes

• @RelationshipEntity
• Represents a relationship in the graph
• Fields saved as properti...

Tweet domain class

@NodeEntity
public class Tweet {
@GraphId private Long id;

@Indexed(unique=true) Long tweetId;
...

Compare to Core-API approach
@NodeEntity
class Tweet {
...

public Collecti
on<Tag> getTags
fina...

Interface based Repositories
๏ based on Repository infrastructure in Spring Data Commons
๏ just deﬁne the interface and th...

Repositories
interface TweetRepository extends GraphRepository<Tweet> {
Tweet findByTweetId(String id);
Collection...

Neo4j-Template (I)

๏ well known Spring Template Pattern
๏ Resource / Transaction Management
๏ Convenience Methods
๏ Nodes...

REST-Client-Support
<bean id="restGraphDatabaseService"
class="org.sf.data.neo4j.rest.SpringRestGraphDatabase"...

Coding the Twitter-Graph

28

Todays Coding Exercise

๏ uses Spring Social (minimally)
๏ Simple Domain: Tweets, Users, Tags
• connected Entities
•...

Spring Data Neo4j Guidebook
“Good Relationships”
“I’m excited about Spring Data Neo4j.... Spring Da...

http://cineasts.net

Check Out: http://spring.neo4j.org/tutorial

O‘Reilly Spring Data Book
„Modern Data Access for Enterprise Java“

• upcoming book by the Spring Data project leads...

y wh ere
ver ect
e E onn
...

Continue here
๏ See the Spring Data Neo4j site for more info:
http://spring.neo4j.org
๏ Again, don’t miss our guid...

Thank You!
Feel free to reach out with questions on

•Twitter,
•Spring-Forums,
•Neo4j-Google-Group
•Stack-Overﬂow

...

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