Time to Graph Up with Spring Data Neo4j

Transcript

1. Gerrit Meier
   @meistermeier
   TIME TO GRAPH UP WITH SPRING DATA NEO4J
   

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2. Neo4j
   

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3. Neo4j
   The Whiteboard Model Is the Physical Model
   Hero
   PART_OF
   Team
   FIGHTS
   Bad Person
   

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4. Neo4j
   The Whiteboard Model Is the Physical Model
   {realName: “Anthony Stark”}
   {event: “Infinity War”}
   :Hero
   :PART_OF
   :Team
   :FIGHTS
   :Bad_Person
   

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5. Neo4j
   The Whiteboard Model Is the Physical Model
   Iron Man
   :PART_OF
   Avengers
   :FIGHTS
   Thanos
   Groot
   :PART_OF
   Guardians
   of the
   Galaxy
   :FIGHTS
   

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6. Neo4j
   Cypher Queries
   MATCH 

   (t:Team)<-[:PART_OF]-(h:Hero)-[f:FIGHTS]->(b:Bad_Person)
   WHERE badPerson.name=“Thanos”
   RETURN *
   

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7. Neo4j
   Cypher Queries
   

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8. Neo4j - Endpoints
   •Embedded
   
   •HTTP
   
   •Bolt
   

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9. Neo4j - Bolt
   •Java
   
   •C#
   
   •JavaScript
   
   •Python
   

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10. Neo4j - Java
    Java Driver
    Neo4j Object Graph Mapper (OGM)
    TransactionManger
    SessionFactory
    

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11. Neo4j - OGM
    Java Driver
    Neo4j Object Graph Mapper (OGM)
    Embedded Bolt HTTP
    

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12. Neo4j - OGM
    •Annotations
    
    •Configuration
    
    •Basic Data Access
    
    • Domain Methods
    
    • Custom Cypher Queries
    
    •Mapping Java Object <> Graph Model
    

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13. Neo4j - OGM Annotations
    :Hero
    :PART_OF
    :Team
    

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14. Neo4j - OGM Annotations
    @NodeEntity(label = "Hero")
    public class Hero {
    @Id @GeneratedValue
    private Long id;
    @Property(name = "name")
    private String superheroName;
    private String realName;
    @Relationship(type = "PART_OF",
    direction = Relationship.OUTGOING)
    private PartOf team;
    }
    :PART_OF
    :Team
    

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15. @RelationshipEntity(type = "PART_OF")
    public class PartOf {
    @Id @GeneratedValue
    private Long id;
    @StartNode
    private Hero hero;
    @EndNode
    private Team team;
    private String role;
    }
    Neo4j - OGM Annotations
    :Hero :Team
    

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16. @NodeEntity
    public class Team {
    @Id @GeneratedValue
    private Long id;
    private String name;
    }
    Neo4j - OGM Annotations
    :PART_OF
    :Hero
    

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17. Neo4j - OGM Configuration
    •Database Access Configuration
    
    • Mode
    
    • Connection Pool Size
    
    • Encryption
    
    •Packages to scan for Entities
    
    •Auto Indexing
    

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18. Neo4j - OGM Data Access
    Session session = sessionFactory.openSession();
    Hero hero = new Hero();
    session.save(hero);
    

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19. Neo4j - OGM Data Access
    Hero hero = session.load(Hero.class, heroId);
    Collection heroes = session.loadAll(Hero.class);
    

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20. Neo4j - OGM Data Access
    Result result = session.query("MATCH (h:Hero) return h", emptyMap());

    Hero hero = session.queryForObject(Hero.class,

    “MATCH (h:Hero) return h", emptyMap());
    

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21. Neo4j - OGM Data Access
    session.delete(hero);
    session.deleteAll(Hero.class);
    

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22. Neo4j Object Graph Mapper (OGM)
    Java Driver
    Embedded Bolt HTTP
    Spring Data Neo4j (SDN)
    Neo4jRepository
    Spring Data Neo4j
    

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23. {name: “Emil Eifrem”}
    Spring Data Neo4j
    

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24. {name: “Emil Eifrem”} {name: “Rod Johnson”}
    Spring Data Neo4j
    

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25. {name: “Emil Eifrem”} {name: “Rod Johnson”}
    Spring Data Neo4j
    

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26. Spring Data Neo4j
    

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27. ?
    Spring Data Neo4j
    

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28. Me
    •Software Engineer @neo4j
    
    • Spring Data Neo4j
    
    • Neo4j Object Graph Mapper
    
    •Co-Leader @JUG_Ostfalen
    

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29. Spring Data Neo4j
    •Abstraction from Cypher (if wanted)
    
    •Derived Query Methods
    
    •Spring Data-ish way to access your data
    
    • CRUD support out-of-the-box
    
    •Specialisation for Graph Operations
    

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30. Spring Data Neo4j
    public interface HeroRepository extends Neo4jRepository {}
    •CRUD methods
    
    • save, findById, delete, count…
    
    •Graph specific
    
    • “second” parameter depth
    

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31. Spring Data Neo4j
    public interface HeroRepository extends Neo4jRepository {
    @Query("MATCH (h:Hero)-[:FIGHTS]->(b:Bad_Person) WHERE b.name={0} return h”)
    List findAllies(String opponent);
    Hero findByRealName(String realName);
    }
    

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32. Spring Data Neo4j
    public interface HeroRepository extends Neo4jRepository {
    @Query("MATCH (h:Hero)-[:FIGHTS]->(b:Bad_Person) WHERE b.name={0} return h”)
    List findAllies(String opponent);
    Hero findByRealName(String realName);
    }
    

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33. Spring Data Neo4j
    public interface HeroRepository extends Neo4jRepository {
    @Query("MATCH (h:Hero)-[:FIGHTS]->(b:Bad_Person) WHERE b.name={0} return h”)
    List findAllies(String opponent);
    Hero findByRealName(String realName);
    }
    MATCH (h:Hero) where h.realName=realName
    

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34. Spring Data Neo4j 5.x
    •Spring Framework 5
    
    •Spring Boot 2 (only)
    
    •Schema-based Loading
    
    •Persistence Constructor
    
    •Spring Expression Language (SpEL) support in @Query
    

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35. Spring Data Neo4j - The Don’ts
    •Complex Custom Cyphers Statements
    
    •Processing high Amount of Nodes
    
    • e.g. Batch operations
    
    •Domain Models do not represent the Graph
    

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36. DEMO
    

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37. About the Demo
    •Download Neo4j Desktop from https://offshoreleaks.icij.org/
    
    •Data description
    
    • Officer: a person or company who plays a role in an offshore entity.
    
    • Intermediary: go-between […]usually a law-firm or a middleman[…]
    
    • Entity: a company, trust or fund created in a low-tax, offshore jurisdiction[…]
    
    • Address: postal address […]
    
    • Other: additional information items.
    

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38. About the Demo
    

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39. QUESTIONS?
    

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40. Gerrit Meier
    @meistermeier
    THANKS!
    

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