Book Image

Graph Data Processing with Cypher

By : Ravindranatha Anthapu
Book Image

Graph Data Processing with Cypher

By: Ravindranatha Anthapu

Overview of this book

While it is easy to learn and understand the Cypher declarative language for querying graph databases, it can be very difficult to master it. As graph databases are becoming more mainstream, there is a dearth of content and guidance for developers to leverage database capabilities fully. This book fills the information gap by describing graph traversal patterns in a simple and readable way. This book provides a guided tour of Cypher from understanding the syntax, building a graph data model, and loading the data into graphs to building queries and profiling the queries for best performance. It introduces APOC utilities that can augment Cypher queries to build complex queries. You’ll also be introduced to visualization tools such as Bloom to get the most out of the graph when presenting the results to the end users. After having worked through this book, you’ll have become a seasoned Cypher query developer with a good understanding of the query language and how to use it for the best performance.
Table of Contents (18 chapters)
1
Part 1: Cypher Introduction
4
Part 2: Working with Cypher
9
Part 3: Advanced Cypher Concepts

Working with advanced path finding

Cypher provides means for variable pathfinding. But it has some limitations, as it is path distinct to make sure we don’t miss any paths. When there are loops in the graph, Cypher can be very memory intensive when we use variable-length paths. Also, if we need to change directions in the traversal or have node label filters, it is not possible in Cypher. This is where APOC provides an option with apoc.path.expandConfig that provides a lot of options with variable-length path expansion.

The syntax for this procedure looks like this:

apoc.path.expandConfig(
    startNode <id>|Node|list, ConfigMap
    ) YIELD path

The config map can have these values:

        minLevel
        maxLevel
        uniqueness
        relationshipFilter...