Spring Data Repositories

• A Repository has methods for retrieving domain objects should delegate to a specialised Repository object such that alternative storage implementations may be interchanged.
• This is important. It allows you to easily substitute the persistence layer.
  • i.e. going from SQL to NoSQL

Spring Data JPA

• Spring Data JPA is part of a larger family of Spring Data projects
• Uses Hibernate for persistence to supported RDBS system (About any major relational database)
• Spring Data JPA provides the implementation at run time (No SQL Required)

How to use Spring Data JPA?

• You extend a Java Repository Interface

interface TodoRepository extends CrudRepository<Todo, Long> {

    Todo findTodoById(Long id);
    Todo save(Todo todo);
    Todo findAll(); 
    Todo deleteById(); 
}