04. Spring Data JPA

Repositories

There are 3 repository interfaces that you should know when you use Spring Data JPA:

• CrudRepository
• PagingAndSortingRepository
• JpaRepository

As you might guess from its name, the CrudRepository interface defines a repository that offers standard create, read, update and delete operations. The PagingAndSortingRepository extends the CrudRepository and adds findAll methods that enable you to sort the result and to retrieve it in a paginated way. Both interfaces are also supported by other Spring Data projects, so that you can apply the same concepts to different datastores. The JpaRepository adds JPA-specific methods, like flush() to trigger a flush on the persistence context or findAll(Example example) to find entities by example, to the PagingAndSortingRepository.