Java: What is the difference between JPA Repository and CrudRepository?

JpaRepository — extends CrudRepository + paging/sorting. CrudRepository — basic CRUD.

CrudRepository:

• Basic CRUD operations.
• save(), findById(), findAll(), deleteById(), count().
• No pagination.
• Simple interface.

1@Repository
2public interface UserRepository extends CrudRepository<User, Long> {
3    // Basic CRUD
4}

JpaRepository:

• Extends CrudRepository + PagingAndSortingRepository.
• Adds: flush(), saveAndFlush(), deleteInBatch().
• Pagination and sorting.
• Batch operations.
• More features for production use.

1@Repository
2public interface UserRepository extends JpaRepository<User, Long> {
3    // CRUD + Pagination + Sorting + Batch
4    Page<User> findByName(String name, Pageable pageable);
5    List<User> findByName(String name, Sort sort);
6}

How it works:

1. CrudRepository provides basic CRUD operations.
2. JpaRepository extends CrudRepository and adds more features.
3. JpaRepository supports pagination and sorting.
4. JpaRepository provides batch operations for better performance.

Key difference:

• JpaRepository = CrudRepository + Pagination + Batch.
• Use JpaRepository for most cases.

Best practice:

• Use JpaRepository for most applications.
• Use CrudRepository for simple applications.
• Consider custom repositories for complex queries.