Question

我有3个表，每个表都映射到一个实体。实体是这样的：

@Entity
@Table(name = "person")
public class Person implements Serializable {
    private int id;
    //other fields
}

@Entity
@Table(name = "phone")
public class Phone implements Serializable {
    private int id;
    private Long price;

    @ManyToOne
    @JoinColumn(name = "personId")
    private Person person;

    @ManyToOne
    @JoinColumn(name = "manufacturerId")
    private Manufacturer manufacturer;
    //other fields
}

@Entity
@Table(name = "manufacturer")
public class Manufacturer implements Serializable {
    private int id;
    private String name;
    //other fields
}

我想要做的是创建一个方法，该方法将返回具有指定制造商的电话的人员列表，其价格在指定范围内。

编辑：我的dao类实现了EntityJpaDao。我需要一个适用于此实现的解决方案。

Answer 1

以下查询将返回具有手机价格范围的三星移动用户。

  Criteria criteria = session.createCriteria(Phone.class, "phone"); 
  criteria.createAlias("phone.person", "person")
  criteria.add(Restrictions.between("phone.price", minPrice, maxPrice));
  criteria.createAlias("phone.manufacturer","manufacturer");
  criteria.add(Restrictions.eq("manufacturer.name", Samsung)); 
  criteria.setProjection(Projections.property("person"));

  List<Person> persons = criteria.list();

如何在连接表上使用JPA（Hibernate）查找具有条件的实体？

1 个答案: