Jennifer Reif, Neo4j ( https://twitter.com/JMHReif ) From relational to NoSQL to graph, we will explore various types of data, the way it is stored, and how best to go about retrieving it.

1. Code Wars
Database Decisions for Application Development
Jennifer Reif
Email: jennifer.reif@neo4j.com
Twitter: @JMHReif
LinkedIn: linkedin.com/in/jmhreif
Github: GitHub.com/JMHReif
Website: jmhreif.com

2. Who Am I?
• Developer relations engineer at Neo4j
• Developer
• Blogger
• Conference speaker
• Continuous learner + geek
Jennifer Reif
Email: jennifer.reif@neo4j.com
Twitter: @JMHReif
LinkedIn: linkedin.com/in/jmhreif
Github: GitHub.com/JMHReif
Website: jmhreif.com

3. Why should the database matter to us?
• Long-term:
• Right tool for the right job
• Future maintenance/improvement e
ff
orts
• Short-term:
• Forcing data into unnatural format
• Data model confusion and iterations
• Complex queries to handle business questions
• Data storage can impact application development!

5. Use case - Northwind sales system

6. Using Spring
• Quick-start (Spring Initializr)
• Reduce boilerplate (Spring Boot)
• Consistent integration (Spring Data):
• Annotation-based mapping for POJOs
• Repository support via interface
• Domain-speci
fi
c language queries for each
https://spring.io/projects/spring-data

7. Data Models
Relational - MariaDB
Document - MongoDB
Graph - Neo4j

8. Data Models

9. Data Models
Relational - MariaDB
Document - MongoDB
Graph - Neo4j

10. Data Models

11. Data Models
Relational - MariaDB
Document - MongoDB
Graph - Neo4j

12. Data Models

13. Demo Time!

14. Key Differences
• POJOs aligning with data models
• Maria: Order -> OrderedProduct <- Product
• Mongo: Order { Product: [{}] }
• Neo4j: Order -[INCLUDES]-> Product
• @Query annotation (DSL syntax)
• Maria: JPQL / SQL
• Mongo: JSON-parameter / SQL
• Neo4j: Cypher

15. Key Differences
• TL;DR - data model impacts app development
• Fit data into a database that creates the…
• Cleanest model
• Simplest queries
• Best application

16. • GitHub projects:
• MariaDB
• Docker: github.com/JMHReif/docker-maria
• Application: github.com/JMHReif/maria-code-wars
• MongoDB
• Docker: github.com/JMHReif/docker-mongo
• Application: github.com/JMHReif/mongo-code-wars
• Neo4j
• Docker: github.com/JMHReif/docker-neo4j
• Application: github.com/JMHReif/neo4j-code-wars
• Db import
fi
les/scripts: github.com/JMHReif/code-wars-import-data-scripts
• Spring Docs: spring.io/projects/spring-data
Resources
Jennifer Reif
Email: jennifer.reif@neo4j.com
Twitter: @JMHReif
LinkedIn: linkedin.com/in/jmhreif
Github: GitHub.com/JMHReif
Website: jmhreif.com