Question

你好我一直在努力解决我的错误，因为我是Spring数据的新手，我有一个名为user和role的模型，我想查询具有角色的用户，但角色可以＆＃39;来自jpa的查询是我的示例代码

用户模块：

@Entity
public class User {

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

@Column(unique = true, nullable = false)
private String username;
private String password;
private String firstName;
private String lastName;
private String middleName;

@ManyToOne
@JsonBackReference
private Role role;

private Boolean isDisable;
//getter and setters here
}

角色模块：

@Entity
public class Role {
@Id
@GeneratedValue(strategy= GenerationType.AUTO)
private Long id;
private String roleName;

@ElementCollection(fetch = FetchType.EAGER)
private List<String> privileges;

@OneToMany(mappedBy="role")
@JsonManagedReference
private List<User> users;
//getter and setter
}

角色存储库：

@Repository
public interface UserRepository extends JpaRepository<User,Long>{
User findByUsername(String username);
List<User> findAll();
}

用户服务实施：

@Service
public class UserServiceImpl implements UserService {

@Autowired
private final UserRepository userRepository;

public UserServiceImpl(UserRepository userRepository) {
    this.userRepository = userRepository;
}

@Override
public User findByUsername(String username) {
    return userRepository.findByUsername(username);
}

@Override
public List<User> findAll() {
    return userRepository.findAll();
}

@Override
public User findById(Long id) {
    return userRepository.findById(id).get();
}

@Override
public User save(User user) {
    return userRepository.save(user);
}
}

用户服务：

@Repository
public interface UserService {

User findByUsername(String string);
List<User> findAll();
User findById(Long id);
User save(User user);
}

响应：

{
"id": 4,
"username": "user",
"password": "$2a$10$ZQMkXzXAXyFvvrZ38UnWkuLpe34pM9c2Qnir/4dtZFyxsANYRkMYy",
"firstName": "user-firstname",
"lastName": "user-lastname",
"middleName": "user-middlename",
"disable": false
}

感谢您的帮助

Spring数据查询多对一列

0 个答案: