loulanyue/jpa-patterns
JPA/Hibernate patterns for entity design, relationships, query optimization, transactions, auditing, indexing, pagination, and pooling in Spring Boot.
npx skills add https://github.com/loulanyue/awesome-claude-notes --skill jpa-patternsSpring Bootでのデータモデリング、リポジトリ、パフォーマンスチューニングに使用します。
@Entity
@Table(name = "markets", indexes = {
@Index(name = "idx_markets_slug", columnList = "slug", unique = true)
})
@EntityListeners(AuditingEntityListener.class)
public class MarketEntity {
@Id @GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(nullable = false, length = 200)
private String name;
@Column(nullable = false, unique = true, length = 120)
private String slug;
@Enumerated(EnumType.STRING)
private MarketStatus status = MarketStatus.ACTIVE;
@CreatedDate private Instant createdAt;
@LastModifiedDate private Instant updatedAt;
}
監査を有効化:
@Configuration
@EnableJpaAuditing
class JpaConfig {}
@OneToMany(mappedBy = "market", cascade = CascadeType.ALL, orphanRemoval = true)
private List<PositionEntity> positions = new ArrayList<>();
JOIN FETCH を使用EAGER を避け、読み取りパスにはDTOプロジェクションを使用@Query("select m from MarketEntity m left join fetch m.positions where m.id = :id")
Optional<MarketEntity> findWithPositions(@Param("id") Long id);
public interface MarketRepository extends JpaRepository<MarketEntity, Long> {
Optional<MarketEntity> findBySlug(String slug);
@Query("select m from MarketEntity m where m.status = :status")
Page<MarketEntity> findByStatus(@Param("status") MarketStatus status, Pageable pageable);
}
public interface MarketSummary {
Long getId();
String getName();
MarketStatus getStatus();
}
Page<MarketSummary> findAllBy(Pageable pageable);
@Transactional を付ける@Transactional(readOnly = true) を使用@Transactional
public Market updateStatus(Long id, MarketStatus status) {
MarketEntity entity = repo.findById(id)
.orElseThrow(() -> new EntityNotFoundException("Market"));
entity.setStatus(status);
return Market.from(entity);
}
PageRequest page = PageRequest.of(pageNumber, pageSize, Sort.by("createdAt").descending());
Page<MarketEntity> markets = repo.findByStatus(MarketStatus.ACTIVE, page);
カーソルライクなページネーションには、順序付けでJPQLに id > :lastId を含める。
status、slug、外部キー）にインデックスを追加status, created_at）select * を避け、必要な列のみを投影saveAll と hibernate.jdbc.batch_size でバッチ書き込み推奨プロパティ:
spring.datasource.hikari.maximum-pool-size=20
spring.datasource.hikari.minimum-idle=5
spring.datasource.hikari.connection-timeout=30000
spring.datasource.hikari.validation-timeout=5000
PostgreSQL LOB処理には、次を追加:
spring.jpa.properties.hibernate.jdbc.lob.non_contextual_creation=true
@DataJpaTest を優先logging.level.org.hibernate.SQL=DEBUG と logging.level.org.hibernate.orm.jdbc.bind=TRACE を設定注意: エンティティを軽量に保ち、クエリを意図的にし、トランザクションを短く保ちます。フェッチ戦略とプロジェクションでN+1を防ぎ、読み取り/書き込みパスにインデックスを作成します。
Take loulanyue/jpa-patterns from the repository into ~/.claude/skills for personal
use, or into .claude/skills inside a project.
The agent identifies a skill by the name field in its header. Two skills with the
same name cannot sit side by side — one of them will be ignored.