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You're reading from Hands-On Full Stack Development with Spring Boot 2.0 and React

Product type Book

Published in Jun 2018

Publisher Packt

ISBN-13 9781789138085

Pages 302 pages

Edition 1st Edition

Languages

Java

Concepts

Full Stack Web Development

Author (1):

Juha Hinkula

Table of Contents (24) Chapters

Title Page

Dedication

Packt Upsell

Contributors

Preface

1. Setting Up the Environment and Tools – Backend

2. Using JPA to Create and Access a Database

3. Creating a RESTful Web Service with Spring Boot

4. Securing and Testing Your Backend

5. Setting Up the Environment and Tools – Frontend

6. Getting Started with React

7. Consuming the REST API with React

8. Useful Third-Party Components for React

9. Setting Up the Frontend for Our Spring Boot RESTful Web Service

10. Adding CRUD Functionalities

11. Styling the Frontend with React Material-UI

12. Testing Your Frontend

13. Securing Your Application

14. Deploying Your Application

15. Best Practices

1. Assessments

2. Other Books You May Enjoy

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Index

Chapter 2. Using JPA to Create and Access a Database

This chapter covers how to use JPA with Spring Boot. We will create a database by using entity classes. In the first phase, we will be using the H2 in-memory database for development and demonstration purposes. H2 is an in-memory SQL database that is really good for fast development or demonstration purposes. In the second phase, we will move from H2 to use MariaDB. This chapter also describes the creation of CRUD repositories and a one-to-many connection between database tables.

In this chapter, we will look at the following:

Basics and benefits of using JPA
How to define a database by using entity classes
How to create Spring Boot backend with a database

Technical requirements

Java SDK version 8 or higher is necessary for the usage of Spring Boot (http://www.oracle.com/technetwork/java/javase/downloads/index.html).

A MariaDB installation is necessary for the creation of the database application (https://downloads.mariadb.org/).

Basics of ORM, JPA, and Hibernate

Object-Relational Mapping (ORM) is a technique that allows you to fetch and manipulate from a database by using an object-oriented programming paradigm. ORM is really nice for programmers because it relies on object-oriented concepts, not on database structure. It also makes development much faster and reduces the amount of source code. ORM is mostly independent of the databases and developers don't have to worry about vendor-specific SQL statements.

Java Persistent API (JPA) provides object-relational mapping for Java developers. The JPA entity is a Java class that presents the structure of a database table. The fields of an entity class present the columns of the database tables.

Hibernate...

Summary

In this chapter, we used JPA to create our Spring Boot application database. First, we created entity classes, which are mapped to database tables. Then, we created CrudRepository for our entity class and that provides CRUD operations for the entity. After that, we managed to add some demo data to our database by using CommandLineRunner. We also created one-to-many relations between two entities. At the beginning of the chapter, we used the H2 in-memory database, while at the end, we switched the database to MariaDB. In the next chapter we will create RESTful web service to our backend.