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  • Neo4j Graph Data Modelling
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Neo4j Graph Data Modelling

Neo4j Graph Data Modelling

By : Mahesh K Lal
3 (1)
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Neo4j Graph Data Modelling

Neo4j Graph Data Modelling

3 (1)
By: Mahesh K Lal

Overview of this book

If you are a developer who wants to understand the fundamentals of modeling data in Neo4j and how it can be used to model full-fledged applications, then this book is for you. Some understanding of domain modeling may be advantageous but is not essential.
Table of Contents (11 chapters)
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Preface
Preface
What this book covers
What you need for this book
Who this book is for
Conventions
Reader feedback
Customer support
Free Chapter
1
1. Graphs Are Everywhere
1. Graphs Are Everywhere
Graphs in mathematics
The property graph model
Storage – native graph storage versus non-native graph storage
Reasons to use graph databases
What to use a graph database for
Choosing Neo4j for exploring graph databases
The structure of the book
Summary
2
2. Modeling Flights and Cities
2. Modeling Flights and Cities
Graphs are more than social
Designing a system to get a travel itinerary
Introduction to modeling nodes and relationships
Using Cypher to operate on Neo4j
Creating cities in Neo4j
Indices
Adding flights to Neo4j
Traversing relationships
Summary
3
3. Formulating an Itinerary
3. Formulating an Itinerary
Creating an itinerary from flights and cities
Business logic should lie in code
Summary
4
4. Modeling Bookings and Users
4. Modeling Bookings and Users
Building a data model for booking flights
A simple model of the bookings ecosystem
Modeling bookings in an RDBMS
Creating bookings and users in Neo4j
Queries to find journeys and bookings
Queries to find the booking history of a user
Summary
5
5. Refactoring the Data Model
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5. Refactoring the Data Model
Capturing information about hotels at airports
Modeling airports and hotels
Extracting airport information from flights
Reasons for not migrating using a single query
Adding hotels to airports
Fetching hotels
Summary
6
6. Modeling Communication Chains
6. Modeling Communication Chains
Capturing traveler reviews for hotels
A model for reviews and comments
Adding reviews to Neo4j
Adding comments to Neo4j
Summary
7
7. Modeling Access Control
7. Modeling Access Control
Controlling access for content change
Modeling hierarchies
Modeling access control groups and employees
Querying the data model to find what is accessible to an employee
Summary
8
8. Recommendations and Analysis of Historical Data
8. Recommendations and Analysis of Historical Data
Recommending cities to travelers
Recommending hotels to travelers
Analysis of the historical data
Summary
9
9. Wrapping Up
9. Wrapping Up
There is no correct model
Further reading and exploration
What to watch out for while using Neo4j
10
Index
Index

Reasons for not migrating using a single query

Evolution is a constant in the software industry. Most of the times migrations are done, the database and code changes are simultaneous and all of this is deployed in a big bang release. An example of a big bang release in our case would be to make the constraint, make data changes, and delete the relationships in one go. This change will need the code to be deployed along with the changes to the database so that the applications keep running. There are multiple downsides to this approach:

  • If something goes wrong at the database end, there might be an outage. A rollback of code will be required along with restoring the database to an earlier state.

  • This is more time consuming since it will require a lot more testing and preparation than smaller increments, which can be leak proofed.

If we separate the migration into two steps—constraint and path creation, and relationship removal—we gain the following advantages:

  • Since constraint and path creation...

End of Section 7
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