![]() List books = generator.create(100, new Random().nextInt()) Public BookService(BookRepository repository) ")) Accessing the database is so easy, that we only need to declare an interface: However, JPA mission is to provide this functionality and it is augmented by Spring Data. We could use the JDBC API to connect to the MariaDB database, run SQL queries, and manually set the returned values in instances of Book. Having these two methods implemented is needed for the correct functioning of JPA. So, two books are the same if they have the same id values regardless of whether the other properties have different values or not. What's important is that we are indicating Lombok to use only the id property for the equals(Object) and hashCode() methods. Lombok's annotation adds getters and setters, and I'm sure you can guess what it does. Important here is to notice that we want the id column to be automatically generated for us if we pass a null value. This class is persistence-ready which means that JPA will be able to map instances of this class to a MariaDB database table (or any other database that provides a JDBC driver). ![]() Import = class Book = GenerationType.IDENTITY)
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