Question

在我的Spring项目中，我分别有域和模型层。域层只是实体，映射到MySQL db中的表。模型用于服务层。我有两个表：User和Roles，它们具有ManyToMany关系。

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proxy_buffer_size       4k;
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proxy_cache             off;
underscores_in_headers  on;

模型

@Entity
@Table(name = "user")
public class UserEntity {
    @Id
    @GeneratedValue
    private Long id;
    private String name;
    @ManyToMany(mappedBy="users", cascade=CascadeType.ALL,fetch=FetchType.EAGER)
    private List<RoleEntity> roles;
//..Getters Setters
}

@Entity
@Table(name = "role")
public class RoleEntity {
    @Id
    @GeneratedValue
    private Long id;
    private String value;
    @ManyToMany(cascade=CascadeType.ALL,fetch=FetchType.EAGER)
    @JoinTable(name = "user_role",
    joinColumns = @JoinColumn(name = "role_id") , inverseJoinColumns = @JoinColumn(name = "user_id") )
    private List<UserEntity> users;
}

存储库层

public class User {
    private Long id;
    private String name;
    private List<Role> roles;
}

public class Role {
    private Long id;
    private String value;
    private List<User> users;
}

服务

@Repository
public interface UserRepo extends JpaRepository<UserEntity, Long>{

}

问题是 - 每次我检索用户，并更新它的属性（例如名称），然后将其保存到表中，连接表user_role中的行也会覆盖。例如，如果它是

id = 1，user_id = 1，role_id = 1

，比更新后变为

id = 2，user_id = 1，role_id = 1

。

@Service
public class UserService {
    @Autowired
    private UserRepo userRepo;

    MapperFactory mapperFactory = new DefaultMapperFactory.Builder().build();
    MapperFacade mapper = mapperFactory.getMapperFacade();

    public void save(User user) {
        userRepo.save(mapper.map(user, UserEntity.class));
    }

    public User getUser(Long id) {
        return mapper.map(userRepo.findOne(id), User.class);

    }
}

没有mapper就可以正常工作，所以mapper就是原因。我无法解决任何问题。有没有人遇到同样的问题？感谢任何帮助。

Orika Bean Mapper Spring Data ManyToMany连接表覆盖

0 个答案: