Intro to Graph Databases

#DevoxxFR #IntroToGraph @Lauren_Schaefer

#IntroToGrapha Devoxx France hands-on lab

@Lauren_Schaefer

1


The plan• What are graph databases and why should you care?

• Schema diagrams

• Create

• Read

• Update

• Delete

• Implement a new feature

• Recommendation engines


All about the workbook• Electronic copy: http://ibm.biz/devoxxfr_workbook

• Learn this!

• Try this!

• Tweet this!

• Get creative

• Additional resources


What are graph databases?


What are graph databases?

• NoSQL• Focus on relationships• Nodes and edges instead of tables



Creative Commons: https://www.flickr.com/photos/hjl/4094315135/


How do you make a graph?



Node(noun

)

Node(noun

)

Node(noun

)

Node(noun

)



Node(noun

)

Node(noun

)

Node(noun

)

Node(noun

)

Edge (Verb)

Edge (Verb)

Edge (Verb)Edge (Verb)



Node(noun

)

Node(noun

)

Node(noun

)

Node(noun

)

Edge (Verb)

Edge (Verb)


PropertiesKey: value




PropertiesKey: value Propertie

sKey: value




How do you traverse a graph?

Node(noun

)

Node(noun

)

Node(noun

)

Node(noun

)

Edge (Verb)

Edge (Verb)




Node(noun

)

Node(noun

)

Node(noun

)

Node(noun

)

Edge (Verb)

Edge (Verb)




Node(noun

)

Node(noun

)

Node(noun

)

Node(noun

)

Edge (Verb)

Edge (Verb)




Node(noun

)

Node(noun

)

Node(noun

)

Node(noun

)

Edge (Verb)

Edge (Verb)



Lauren’s Lovely Landscapes






Lauren’s Lovely Landscapes as a graph



Alaska



Alaskalabel: printname: Alaskadescription: Lauren loves this photo even though she wasn't present when the photo was taken. Her husband took this photo on a guy's weekend in Alaska. price: 75imgPath: alaska.jpg



Alaska



Alaska

Antarctica

Las Vegas

Australia

Japan



Alaska

Antarctica

Las Vegas

Australia

Japan

Jason



Alaska

Antarctica

Las Vegas

Australia

Japan

Jasonlabel: userfirstName: JasonlastName: Schaeferusername: jasonemail: [email protected]



Alaska

Antarctica

Las Vegas

Australia

Japan

Jason



Alaska

Antarctica

Las Vegas

Australia

Japan

Jason

Joy

Deanna

Dale



Alaska

Antarctica

Las Vegas

Australia

Japan

Jason

Joy

Deanna

Dale



Alaska

Antarctica

Las Vegas

Australia

Japan

Jason

Joy

Deanna

Dale

label: buysdatetime: 2016-10-15 13:13:17firstName: JasonlastName: Schaeferaddress1: 123 Sweet Laneaddress2: Apt #5city: Valentinestate: NEzip: 69201paymentMethod: Paypass



Alaska

Antarctica

Las Vegas

Australia

Japan

Jason

Joy

Deanna

Dale



Alaska

Antarctica

Las Vegas

Australia

Japan

Jason

Joy

Deanna

Dale



Alaska

Antarctica

Las Vegas

Australia

Japan

Jason

Joy

Deanna

Dale


Lauren’s Lovely Landscapes as a relational database

ID Name Description Price imgPath1 Alaska Lauren loves this

photo even though she wasn't present

when the photo was taken. Her husband took this photo on a

guy's weekend in Alaska.

75 alaska.jpg

2 Las Vegas What happens in Vegas, stays in

Vegas... unless you take a picture.

90 vegas.jpg

ID FirstNam

e

LastName

Username

Email

1 Jason Schaefer

jason [email protected]

2 Joy Haywood

Joy [email protected]

User Print Datetime FirstName

LastName

Address1

Address2

City State

Zip PaymentMethod

1 1 2016-10-15 13:13:17

Jason Schaefer

123 Sweet Lane

Apt #5 Valentine

NE 69201

paypass

2 2 2016-04-22 14:48:30

Joy Haywood

423 Purple St

Honolulu

HI 96818

Credit card


Should you care about graph databases?


Graph databases are massively increasing in popularity

http://db-engines.com/en/ranking_categories


PeoplePeople who viewed this item ultimately bought…

Blue pool float Red wagon


Places


Things


Fraud

$$$


Many more use cases• Modeling social networks

• Diagnosing psychosis with word analysis

• Analyzing the spread of epidemics

• Modeling a bio network

• Visualizing a social/economic/political network


Let’s try a graph database


Try this!• Register at Bluemix: ibm.biz/devoxxfr• Deploy the app: ibm.biz/devoxxfr_deploy• Try the app


How do you create a schema diagram for a graph?


1. Model the nouns and verbs

printuser buys


2. Define vertices and edges

label: printlabel: user label: buys


3. Define the multiplicitylabel: printlabel: user label: buys

MULTI


4. Add propertieslabel: printtype: print

name: stringdescription:

stringprice: float

imgPath: string

label: usertype: userfirstName:

stringlastName:

stringusername:

stringemail: string

label: buysdatetime: stringaddress1: stringaddress2: string

city: stringstate: stringzip: integer

paymentMethod: stringMULTI


5. Create indexeslabel: printtype: print


stringprice: float

imgPath: string


stringlastName:

stringusername:

stringemail: string




Vertex Indexes:userByName: [firstName, lastName], mixed, not unique, indexOnly (user)userByUsername: [username], composite, unique, indexOnly (user)printByName: [name], composite, unique, indexOnly (print)vByPrice: [price], mixed, not unique


How do you convert a schema diagram to code?


Live demo!• Convert the diagram to code!

• Show how the code is creating the schema in graph.py


Convert this diagram to code

label: printtype: print


stringprice: float

imgPath: string


stringlastName:

stringusername:

stringemail: string




Vertex Indexes:userByName: [firstName, lastName], mixed, not unique, indexOnly (user)userByUsername: [username], composite, unique, indexOnly (user)printByName: [name], composite, unique, indexOnly (print)vByPrice: [price], mixed, not unique


Try this!• Add a new print to the app’s home page


How do you create a node or edge in a graph database?


Live demo!• Create a node for a new print



stringprice: float

imgPath: string


stringlastName:

stringusername:

stringemail: string





Try this!• Write a Gremlin query that creates a new

user• Explore the code that creates a new user


How do you read a node or edge in a graph database?


Live demo!• Read a node for the Alaska print



stringprice: float

imgPath: string


stringlastName:

stringusername:

stringemail: string





Try this!• Write a Gremlin query that gets a user’s information• Explore the code that displays a user’s profile


How do you update a node or edge in a graph database?


Live demo!• Update a node for an existing print



stringprice: float

imgPath: string


stringlastName:

stringusername:

stringemail: string





Try this!• Write a Gremlin query that updates a user’s

information• Explore the code that updates a user’s profile


How do you delete a node or edge in a graph database?


Live demo!• Delete a node for a user



stringprice: float

imgPath: string


stringlastName:

stringusername:

stringemail: string





Try this!• Write a Gremlin query that deletes all of the edges and

nodes• Explore the code that deletes all of the data from the

graph


How do you implement a feature that requires a new

graph query?


Try this!• Implement a feature to display orders on a user’s profile

page - Observe the schema diagram - Write and test a query - Write the code that contains the query - Write the view code


How do you create a recommendation engine?


Generating recommendations


TinkerPop recipe


Recommendations for DaleAlaska

Antarctica

Las Vegas

Australia

Japan

Jason

Joy

Deanna

Dale



Antarctica

Las Vegas

Australia

Japan

Jason

Joy

Deanna

Dale



Antarctica

Las Vegas

Australia

Japan

Jason

Joy

Deanna

Dale



Antarctica

Las Vegas

Australia

Japan

Jason

Joy

Deanna

Dale



Antarctica

Las Vegas

Australia

Japan

Jason

Joy

Deanna

Dale


Live demo!• Write Gremlin queries to generate recommendations


Try this!• Write a query for generating recommendations on a product

page• Implement the feature to display recommendations on a

product page


That’s all for now…• To access the resources associated with this presentation…

- visit http://ibm.biz/devoxxfr_workbook - visit http://ibm.biz/devoxxfr_lab_slides

• To continue to learn more about Lauren, IBM Graph, and Bluemix, follow @Lauren_Schaefer @IBMGraph @IBMBluemix

Technology

Intro to Graph Databases