我有两个实体，
父实体

Entity
@Table(name = "parent")
@Data
@NoArgsConstructor
public class Parent {

  @Column(name = "uuid")
  private UUID uuid;

  @Column(name = "type")
  private String type;

  @Column(name = "gateway")
  private String gateway;

  @OneToMany(fetch = FetchType.EAGER,orphanRemoval = true)
  @JoinColumn(name = "example")
  @OnDelete(action = OnDeleteAction.CASCADE)
  private List<Child> childs;

...
other paramerters

}

还有我的孩子

@Entity
@Table(name = "child")
@Data
@NoArgsConstructor
public class Child {

    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE)
    @Column(name = "id")
    private Long id;

    @Column(name = "unit")
    private String unit;

    @ManyToOne(fetch = FetchType.EAGER, optional = false)
    @JoinColumn(name = "example")
    private Parent parent;

...
other paramerters
}

所以当我调用get方法时 @Transactional 它总是执行更新操作？？为什么？我该怎么防止呢？
get方法

public class PublicImp implements CRUD {

    @Transactional(isolation = Isolation.READ_COMMITTED)
    @Override
    public Parent getParent(UUID uuid) {
List<Parent> parents = repository.findByUUID(uuid);
return parents.get(0);

    }
}

这是日志上的

update
        child 
    set
        unit=? 
    where
        id=?
Hibernate: 
    update
        child 
    set
        unit=? 
    where
        id=?

2020-11-26 | 20:16:16.592 | http-nio-9797-exec-1 | TRACE | o.h.t.d.sql.BasicBinder | binding parameter [1] as [VARCHAR] - [kWh]
2020-11-26 | 20:16:16.592 | http-nio-9797-exec-1 | TRACE | o.h.t.d.sql.BasicBinder | binding parameter [2] as [BIGINT] - [2493]

编辑：我的存储库

public interface DeviceInfoRepository extends JpaRepository<Parent,String> {
  List<Parent> findByUUID(UUID uuid);

}