java - 如何通过 jpa 吸引参与者？

Question

我有这个实体:

@Entity
@Table(name = "Participant")
public class Participant {

    @Column(name = "user")
    User user;

    @Column(name = "meet")
    Meet meet;

    @Enumerated(EnumType.STRING)
    @Column(name = "rol")
    Rol rol;

Meet 类是:

@Entity
@Table(name = "Meet")
public class Meet implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;

    @Column(unique = true, name = "name")
    private String name;

    @Enumerated(EnumType.STRING)
    @Column(name = "state")
    private State state;

我想通过 session 获得参与者

@Query("SELECT p FROM Participant p where p.meet= :id")
    Participant findByMeet(@Param("id") Long id);

如何获取属于 session 的参与者列表

Answer 1

假设您在Participant中有一个Long的@Id，它应该是这样的。

@Repository
public interface ParticipantRepository implements CrudRepository<Participant, Long> {
  List<Participant> findAllByMeet(Meet meet);
}

Spring Data 将为您动态提供实现。