spring-data-jpa

# Spring Data JPA ## Overview Provides patterns for Spring Data JPA repositories, entity relationships, queries, pagination, auditing, and transactions. ## When to Use Creating repositories with CRUD operations, entity relationships, `@Query` annotations, pagination, auditing, or UUID primary keys. ## Instructions ### Create Repository Interfaces To implement a repository interface: 1. **Extend the appropriate repository interface:** ```java @Repository public interface UserRepository extends JpaRepository<User, Long> { // Custom methods defined here } ``` 2. **Use derived queries for simple conditions:** ```java Optional<User> findByEmail(String email); List<User> findByStatusOrderByCreatedDateDesc(String status); ``` 3. **Implement custom queries with `@`Query:** ```java @Query("SELECT u FROM User u WHERE u.status = :status") List<User> findActiveUsers(@Param("status") String status); ``` ### Configure Entities 1. **Define entities with proper annotations:** ```java @Entity @Table(name = "users") public class User { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; @Column(nullable = false, length = 100) private String email; } ``` 2. **Configure relationships using appropriate cascade types:** ```java @OneToMany(mappedBy = "user", cascade = CascadeType.ALL, orphanRemoval = true) private List<Order> orders = new ArrayList<>(); `...