[英]Getting data from a Bidirectional One to Many Relationship in Hibernate/Spring Data
[英]How to get json data only from parent class in hibernate one to many relationship in spring framework
我正在使用spring框架并将hibernate用作ORM工具。
我的父母班是这样的:
@Entity
public class Category {
@Id
@GeneratedValue
@NotNull
private int cid;
private String cname;
@OneToMany(cascade = CascadeType.ALL)
@LazyCollection(LazyCollectionOption.FALSE)
@JoinColumn(name = "cid")
List<Ad> ads;
// getter和setter,构造函数}
我的孩子班是这样的:
@Entity
public class Ad {
private int adid;
private String adName;
//getter and setter, constructor
}
我的类别控制器是:
@Controller
public class CategoryController {
@Autowired
SessionFactory sessionFactory;
Session session;
@Transactional
@RequestMapping(value = "categories",method = RequestMethod.GET)
@ResponseBody
public List<Category> getAllCategory()throws SQLException{
session=sessionFactory.getCurrentSession();
return session.createCriteria(Category.class).list();
}
}
当我点击url localhost:8080 / categories。我得到像json数据:
{"cid":"1",cname":"category","ads":[{"adid":"1","adName":"ad"}]}
在这里,我同时获取父表和相关子表的数据,但是如何只获取父表的数据,在此示例中,我需要像这样的数据:
{"cid":"1",cname":"category"}
我怎样才能做到这一点
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