Neo4j实战：探索图形数据库的世界

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"《Neo4j in Action》是Manning出版社于2014年12月出版的一本书，由Aleksa Vukotic、Nicki Watt撰写，Tareq Abedrabbo、Dominic Fox和Jonas Partner参与编写，Jim Webber和Ian Robinson作序。这本书全面介绍了图数据库系统Neo4j的使用和应用。 Neo4j是一个强大的开源图数据库，它以图形结构存储数据，非常适合处理复杂关系的数据。书中的内容可能涵盖了Neo4j的基本概念，包括节点、关系和属性，以及如何利用Cypher查询语言来操作这些数据。Cypher是一种声明式、易于学习的语言，用于在Neo4j中执行复杂的查询和数据操作。作者们可能详细讲解了如何安装和配置Neo4j，以及如何在实际项目中集成和使用它。书中可能会涉及数据建模，帮助读者理解如何将传统的关系型数据库模式转化为图数据模型。此外，还会讨论到性能优化，包括索引创建、查询优化和内存管理。书中也可能探讨了 Neo4j 的高级特性，如事务脚本、图算法和实时分析。对于开发者来说，可能有专门的章节介绍如何与各种编程语言（如Java、Python、JavaScript等）进行集成，以及如何使用RESTful API进行远程操作。此外，还可能涵盖了图数据库在社交网络分析、推荐系统、知识图谱和网络安全等领域的应用实例。这本书作为实战指南，可能会提供实际的案例研究和练习，帮助读者通过实践来掌握Neo4j的用法。通过阅读，读者不仅可以学习到Neo4j的技术细节，还能了解到如何在现实世界的问题中有效利用图数据库的优势。《Neo4j in Action》是一本深入浅出的图数据库入门和进阶读物，适合对图数据库感兴趣的开发人员、数据科学家和架构师阅读。无论你是初学者还是经验丰富的专业人士，这本书都能提供宝贵的指导和见解，帮助你在图数据的世界中游刃有余。"

ACKNOWLEDGMENTS

Brian Gyss, Christoph Jasinski, Frank Uzzolino, Fred Patton, Janeen Johnson, John D.

Lewis, Joshua White, Mark Watson, Philippe Lamote, Pouria Amirian, Rikke Willer,

Robert Gimbel, Rod Hilton, and Stephen Kitt.

Thanks also to Jim Webber and Ian Robinson for contributing the foreword to our

book, and to Craig Taverner for his technical expertise as he reviewed the manuscript

and code examples one more time, just before production.

There are many others who contributed in various ways as well. We cannot men-

tion everyone by name as this would mean that the acknowledgments would roll on

and on, but we’d like to send a big thank you to everyone else who had a hand in help-

ing make this book possible!

ABOUT THIS BOOK

xvii

interact with the graph promotes easier integration regardless of the client—Java,

shell, or something else. In any case, we leave this for a potential second edition as we

still believe there are many core fundamental concepts and approaches in this book

that need to be conveyed first. The book assumes the latest version of

JDK

7 is being

used. Additionally, the sample code that accompanies this book makes use of Maven

as our build dependency tool of choice. For those unfamiliar with Maven, we provide

a quick getting started section in appendix B to help get you up and running.

It should be noted that this is not meant to be a reference book; it would be a lot

longer if that were the case. It does aim to arm you with enough knowledge and

understanding in each area to be relatively proficient before moving on. Links are

provided to appropriate content where you can get more information should you

want to explore any specific area further.

Roadmap

This book is divided into three parts. Part 1 is an introduction and covers data modeling,

starting development with Neo4j, and the power of transversals. Part 2 takes on applica-

tion development and covers Cypher and Spring. Part 3 covers Neo4j in production.

Chapter 1 introduces graph database concepts in general, including looking at

some of Neo4j’s key aspects and the typical use cases which it is well suited to

address. The chapter goes on to address some of the questions about where Neo4j

fits within the so-called No

SQL

space, including comparing it with more traditional

relational databases.

Chapter 2 examines how and why we model data in Neo4j, including common

approaches to data modeling scenarios in a graph database. Examples from a variety

of domains are also presented, giving you a sense for just how flexible data modeling

in Neo4j can be.

Chapter 3 is where we really start getting our hands dirty. This chapter introduces

you to the Neo4j Core Java

API

, where you are taken through the steps of creating a

graph representing a social network of users and the movies they like. This chapter

covers creating and connecting nodes and capturing additional information against

these nodes. It also looks at strategies for differentiating between types of nodes,

including the use of labels.

Chapter 4 builds on this social network domain, exploring the core

API

in more

depth and focusing specifically on traversals—in this case the Neo4j Traversal

API

—as

a powerful way of querying graph data.

Chapter 5 introduces the indexing strategies available in Neo4j. Creating and tra-

versing graph data is great, but you will need a strategy for finding the starting point,

or points, in your graph from which to begin. This chapter covers these options. You

will begin by looking at the manual (legacy) indexing options, before moving on to

the built-in indexing options available from Neo4j 2.0 onward.

Chapter 6 introduces Cypher, Neo4j’s human-readable query language. The nature

of Cypher is explained, its basic syntax for graph operations is demonstrated, and

ABOUT THIS BOOK

xviii

advanced features that can be useful in day-to-day development and maintenance of

Neo4j databases are also covered.

Chapter 7 focuses on one of the unique selling points of Neo4j in the No

SQL

space—the fact that it fully supports

ACID

-based transactions, providing examples of

different uses as well as taking a more in-depth look at certain aspects.

While chapter 4 provides your initial foray into the world of traversals, writing effi-

cient traversals is the key to successfully querying graph data. In chapter 8 we dig

deeper into the inner workings of the Traversal

API

so you can learn how to solve the

most complex graph problems in an efficient manner with the native

API

Chapter 9 looks at Spring Data Neo4j library (

SDN

), the object graph-mapping

library. Though not an official Neo4j offering, this chapter focuses on demonstrating

how the Neo4j-specific open source framework can be used as a library to provide a

robust and seamless mapping experience between a rich object graph model and data

backed by Neo4j. Once again our trusty social network of users and their favorite mov-

ies is used to demonstrate these points.

Chapter 10 explores the two main usage modes in Neo4j, namely embedded and

server. Much of the book has focused on demonstrating core concepts using the

embedded mode. This chapter additionally introduces the server mode, which can be

used by just about any client, and explores each mode in a bit more depth, weighing

the pros and cons of each, including how to get the most out of your server if you

choose to use this option.

Chapter 11 finishes off with an overview of the high-level Neo4j architecture.

Framed with this knowledge, the chapter explores what should be considered when

you want to take Neo4j to production, including scaling and other requirements for

making Neo4j highly available, finishing off with instructions for how to back up and

restore your database should it be required.

The four appendixes guide you through installing, setting up, and running Neo4j,

Maven, and

SDN

, and offer guidance for seeking more help.

Code conventions and downloads

All source code in the book is in a

fixed-width

font

this

, which sets it off from

the surrounding text. In many listings, the code is annotated to point out the key con-

cepts, and numbered bullets are sometimes used in the text to provide additional

information about the code.

Most of the code shown in the book can be found in various forms in the sample

source code that accompanies it. The sample code can be downloaded free of charge

from the Manning website at www.manning.com/Neo4jinAction, as well as at https://

github.com/opencredo/neo4j-in-action.

The sample code is structured as a set of

nit style tests that aim to highlight

and/or demonstrate the particular code under discussion. Instructions for how you

can run the sample code are provided in appendix B.

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Neo4j实战：探索图形数据库的世界

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