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

Product typeBook
Published inJun 2018
Reading LevelBeginner
PublisherPackt
ISBN-139781789138085
Edition1st Edition
Languages
Java
Tools
ReactSpring
Concepts
Full Stack Web Development
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Author (1)
Juha Hinkula
Juha Hinkula
author image
Juha Hinkula

Juha Hinkula is a software development lecturer at Haaga-Helia University of Applied Sciences in Finland. He received an MSc degree in Computer Science from the University of Helsinki and he has over 17 years of industry experience in software development. Over the past few years, he has focused on modern full stack development. He is also a passionate mobile developer with Android-native technology, and also uses React Native.
Read more about Juha Hinkula

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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.

Questions

  1. What are ORM, JPA, and Hibernate?
  2. How can you create an entity class?
  3. How can you create CrudRepository?
  4. How does the CrudRepository provide for your application?
  5. How can you create a one-to-many relationship between tables?
  6. How can you add demo data to a database with Spring Boot?
  7. How can you access the H2 console?
  8. How can you connect your Spring Boot application to MariaDB?
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Published in: Jun 2018Publisher: PacktISBN-13: 9781789138085
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Author (1)

author image
Juha Hinkula

Juha Hinkula is a software development lecturer at Haaga-Helia University of Applied Sciences in Finland. He received an MSc degree in Computer Science from the University of Helsinki and he has over 17 years of industry experience in software development. Over the past few years, he has focused on modern full stack development. He is also a passionate mobile developer with Android-native technology, and also uses React Native.
Read more about Juha Hinkula

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