Chapter 3

1. Object-relational mapping (ORM) is a technique that allows you to fetch and manipulate data from a database using an object-oriented programming paradigm. Java Persistence API (JPA) provides object-relational mapping for Java developers. Hibernate is a Java-based JPA implementation.
2. The entity class is just a standard Java class that is annotated with the @Entity annotation. You have to implement constructors, fields, getters, and setters inside the class. The unique ID field(s) are annotated with the @Id annotation.
3. You have to create a new interface that extends the Spring Data CrudRepository interface. You define the entity and the type of the id field in the type arguments—for example, <Car, Long>.
4. CrudRepository provides all CRUD operations to your entity. You can create, read, update, and delete your entities using CrudRepository.
5. You have to create...