Book Image

Spring Data

By : Petri Kainulainen
Book Image

Spring Data

By: Petri Kainulainen

Overview of this book

Spring Framework has always had a good support for different data access technologies. However, developers had to use technology-specific APIs, which often led to a situation where a lot of boilerplate code had to be written in order to implement even the simplest operations. Spring Data changed all this. Spring Data makes it easier to implement Spring-powered applications that use cloud-based storage services, NoSQL databases, map-reduce frameworks or relational databases. "Spring Data" is a practical guide that is full of step-by-step instructions and examples which ensure that you can start using the Java Persistence API and Redis in your applications without extra hassle. This book provides a brief introduction to the underlying data storage technologies, gives step-by-step instructions that will help you utilize the discussed technologies in your applications, and provides a solid foundation for expanding your knowledge beyond the concepts described in this book. You will learn an easier way to manage your entities and to create database queries with Spring Data JPA. This book also demonstrates how you can add custom functions to your repositories. You will also learn how to use the Redis key-value store as data storage and to use its other features for enhancing your applications. "Spring Data" includes all the practical instructions and examples that provide you with all the information you need to create JPA repositories with Spring Data JPA and to utilize the performance of Redis in your applications by using Spring Data Redis.
Table of Contents (13 chapters)

Implementing CRUD functionality for an entity

We have now configured the Spring application context and configured our web application to load it during startup. We will now implement CRUD functions for a simple entity. Our example application is used to view and manage contact information, and we can implement it by following these steps:

  1. Create a domain model.

  2. Create a repository for an entity.

  3. Implement CRUD functions.


This chapter describes only such parts of our application that are required to understand how Spring Data JPA works.

Domain model

The domain model of our application consists of two classes: Contact and Address. This subsection will address the following matters:

  • The information content of each class

  • How we can create new objects by using the builder pattern (see also: Effective Java (Second Edition), Joshua Bloch, Addison-Wesley)

  • How we can update the information of an object


The Contact class is the only entity of our domain model and it contains the information of a...