Marco Liberati - Graph Analytics in the AperiTech Community

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Codemotion

GraphRM | 15.03.2018 | #AperiTech

Tecnología

Costruiamo un motore di raccomandazione con Neo4J
Workshop 25/01/2018

Marco Liberati
@dej611
Piero Savastano
@_pieroit_

● Graph database (written in Java)
● Schema-less
● Cypher query language
○ ASCII art as query
○ Pattern matching

(user :USER { name: “Marco” })
Cypher Node
Variabile
Label
Property
Value

-[action:TAGGED {when: 130… }] ->
Cypher Link/Relationship
Variabile
Label
Property
Value

MATCH (u:User)-[r:JOINED]->(m:Meetup)
Cypher Query
PATTERN MATCHING:
Descrivi uno o piu percorsi del grafo
in ASCII art.
Tutti i percorsi che rispettano il
criterio di forma (e non solo…)
verranno presi da Neo4J a questo
punto

MATCH (u:User)-[r:JOINED]->(m:Meetup)
WHERE u.name = “Marco”
Cypher Query
Applica delle
condizioni alle
variabili
dichiarate sopra
PATTERN MATCHING:
Descrivi uno o piu percorsi del grafo
in ASCII art.
Tutti i percorsi che rispettano il
criterio di forma (e non solo…)
verranno presi da Neo4J a questo
punto

MATCH (u:User)-[r:JOINED]->(m:Meetup)
WHERE u.name = “Marco”
RETURN u, r, m;
Cypher Query
Applica delle
condizioni alle
variabili
dichiarate sopra
Con return si
descrive cosa
mettere su
ogni riga dei
risultati
PATTERN MATCHING:
Descrivi uno o piu percorsi del grafo
in ASCII art.
Tutti i percorsi che rispettano il
criterio di forma (e non solo…)
verranno presi da Neo4J a questo
punto

Cypher cheatsheet
https://neo4j.com/docs/cypher-refcard/current/

Graph traversal
(u:User)-[r:JOINED]->(m:Meetup)

Get users joining a meetup
after 1 November 2017

CALL db.[procedura]
CALL apoc.json.load ….
Per vedere tutte quelle disponibili:
CALL dbms.procedures();
User functions / Procedures

MATCH (u:User)-[r:JOINED]->(m:Meetup)
WITH u, collect( m ) as meetups
Cypher Query 2
WITH permette di fermarsi e
calcolare valori aggregati.
Oppure coniugare più query

MATCH (u:User)-[r:JOINED]->(m:Meetup)
WITH u, collect( m ) as meetups
RETURN u, meetups
Cypher Query 2
WITH permette di fermarsi e
calcolare valori aggregati.
Oppure coniugare più query
RETURN può accedere
alla nuova variabile
meetups. Non può però
accedere sopra il WITH
(i.e. “r”)

What meetup should we suggest to Eros?
Eros

What meetup should we suggest to Eros based on
topics he likes?

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