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