如何在实体关系不是直接的情况下使用休眠条件联接多个表？

Question

我有三个实体。那些是：

@Entity
public class Organization {
    @Id
    private long id;
    @Column
    private String name;
}



@Entity
public class Book {
    @Id
    private Long id;
    @Column
    private String name;
    @ManyToOne
    private Organization organization;
}



@Entity
public class Account  {
   @Id
   private Long id;
   @Column
   private String name;
   @ManyToOne
   private Book book;
}

在这三个实体中，我想执行以下sql：

SELECT acc.name, acc.id
FROM account acc
JOIN book b on acc.book_id = b.id
JOIN organization org on b.organization_id = org.id
WHERE org.name = 'XYZ'

在这种情况下，Account实体与Organization实体没有直接关系。Account实体具有通过的关系Book。如何使用休眠条件动态查询实现此目的？

Answer 1

你可以这样：

Criteria accountCriteria = getCurrentSession().createCriteria(Account.class,"acc");
Criteria bookCriteria =  accountCriteria .createCriteria("book","b");
Criteria orgCriteria =  bookCriteria.createCriteria("organization","org");
orgCriteria.add(Restrictions.eq("name", "XYZ"));

ProjectionList properties = Projections.projectionList();
properties.add(Projections.property("name"));
properties.add(Projections.property("id"));

accountCriteria.setProjection(properties);
accountCriteria.list();