我是 Spring MVC 和 Hibernate 的新手，我遇到了一个问题。我有由 Hibernate 创建的子表，它与用户表（多对一）连接。当 Hibernate 创建 Child 表时，会自动添加 'user_object_id' - 通过 'user_object'（用户类型）将这两个表连接起来。但是，当我只想向用户展示他的孩子时，就会出现问题：
HTTP Status 500 - Request processing failed; nested exception is org.hibernate.QueryException:
could not resolve property: user_object_id of: com.websystique.springmvc.model.Child
我在 findAllUserChilds 方法中从 ChildDaoImpl 类的表中获取 Child 对象，然后映射到 ChildController 中的 ChildDTO（POJO 对象）。错误与子模型中的“user_object_id”有关，因为该变量不存在，因为它是由 Hibernate 自动创建并由 Criteria 在 findAllUserChilds() 中返回的。我怎么解决这个问题？
孩子：
@Entity
@Table(name= "Child")
public class Child implements Serializable
{
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
@Column (nullable=false)
private String first_name;
@Column (nullable=false)
private String last_name;
@Column (nullable=false)
private String birth_city;
@Column (nullable=false)
private String pesel;
@Column (nullable=false)
private String sex;
@Column (nullable=false)
private String blood_group;
@Column (nullable=false)
private String birth_date;
@ManyToOne
private User user_object;
public User getUser_object() {
return user_object;
}
public void setUser_object(User user_object) {
this.user_object = user_object;
}
(...
some getters and setters
...)
}
子控制器：
@RequestMapping(value = "/mainpanel" , method = RequestMethod.GET,
headers = "accept=application/json")
public List<ChildDTO> listChild(HttpServletResponse request)
{
Authentication auth = SecurityContextHolder.getContext().getAuthentication();
String username = auth.getName();
User user = userService.findUserByUsername(username);
List<Child> list = service.findAllUserChilds(user.getId());
List<ChildDTO> result = new ArrayList<>();
for (Child child : list)
{
result.add(ChildMapper.map(child));
}
return result;
}
ChildDaoImpl：
@Repository("ChildDao")
public class ChildDaoImpl extends AbstractDao<Integer, Child> implements ChildDao {
@SuppressWarnings("unchecked")
public List<Child> findAllUserChilds(int user_id)
{
Criteria criteria = createEntityCriteria();
criteria.add(Restrictions.eq("user_object_id", user_id));
return (List<Child>) criteria.list();
}
}