Intro to Graph Databases

#DevoxxFR #IntroToGraph @Lauren_Schaefer

#IntroToGrapha Devoxx France hands-on lab

@Lauren_Schaefer

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?

• 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

Edge (Verb)

Edge (Verb)Edge (Verb)

Node(noun

Edge (Verb)

PropertiesKey: value

PropertiesKey: value Propertie

sKey: value

PropertiesKey: value

How do you traverse a graph?

Node(noun

Edge (Verb)

Node(noun

Edge (Verb)

Node(noun

Edge (Verb)

Node(noun

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

Antarctica

Las Vegas

Australia

Alaska

Antarctica

Las Vegas

Australia

Alaska

Antarctica

Las Vegas

Australia

Jasonlabel: userfirstName: JasonlastName: Schaeferusername: jasonemail: jason@example.com

Alaska

Antarctica

Las Vegas

Australia

Alaska

Antarctica

Las Vegas

Australia

Deanna

Alaska

Antarctica

Las Vegas

Australia

Deanna

Alaska

Antarctica

Las Vegas

Australia

Deanna

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

Alaska

Antarctica

Las Vegas

Australia

Deanna

Alaska

Antarctica

Las Vegas

Australia

Deanna

Alaska

Antarctica

Las Vegas

Australia

Deanna

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

LastName

Username

1 Jason Schaefer

jason jason@example.com

2 Joy Haywood

Joy joy@example.com

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

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

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

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

Deanna

Antarctica

Las Vegas

Australia

Deanna

Antarctica

Las Vegas

Australia

Deanna

Antarctica

Las Vegas

Australia

Deanna

Antarctica

Las Vegas

Australia

Deanna

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

Intro to Graph Databases

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