使用 Hibernate Criteria 並限制不同的關系屬性

Question

So I'm working on a Court like application based on JSF 2.3 Hibernate 4.3 and I'm struggling to figure out how to build a given query using Hibernate Criteria API. 這個想法是 select 認證用戶參與的所有進程。

所涉及的實體簡化如下：

用戶.java

@Entity
@Table(name = "tb_users")
public class User implements Serializable {
    
    @Id
    @GeneratedValue
    private Long id;
    
    @ManyToOne
    private User lawyer;
    
    /* other attributes, getters, setters... */
}

制程.java

@Entity
@Table(name = "tb_processes")
public class Process implements Serializable {

    @Id
    @GeneratedValue
    private Long id;

    @ManyToOne
    private User judge;

    @ManyToOne
    private User promoterParty;

    @ManyToOne
    private User promotedParty;
    
    /* other attributes, getters, setters... */
}

在我的 bean 中，我想列出用戶在某種程度上參與的流程（作為法官或作為當事人或作為當事人的律師）。 所以這是我使用 Criteria API 可以獲得的最接近的結果：

@Named
@RequestScoped
public class IndexBean implements Serializable {
    
    @Inject
    private ExternalContext externalContext;

    public List<Process> getProcesses() {
        HttpSession httpSession = (HttpSession) externalContext.getSession(false);
        User user = (User) httpSession.getAttribute("auth");
        
        Criteria criteria = dao.criteria(Process.class);
        criteria.add(Restrictions.or(
        /* 1 */  Restrictions.eq("judge.id", user.getId()),                // works fine
        /* 2 */    Restrictions.eq("promoterParty.id", user.getId()),        // works fine 
        /* 3 */    Restrictions.eq("promotedParty.id", user.getId()),        // works fine
        /* 4 */    Restrictions.eq("promoterParty.lawyer.id", user.getId()), // [fail] org.hibernate.QueryException: could not resolve property: promoterParty.lawyer.id of: com.example.model.Process
        /* 5 */    Restrictions.eq("promotedParty.lawyer.id", user.getId())  // [fail] org.hibernate.QueryException: could not resolve property: promotedParty.lawyer.id of: com.example.model.Process
        ));
        
        return criteria.list();
    }
}

挑戰是在關系（4和5）的關系中添加限制，而其他的單獨工作正常。

有人可以幫我弄清楚如何構建這個查詢嗎？

Answer 1

我做了這樣的事情，它似乎工作 - 生成的查詢看起來不是超級干凈（我不希望它）：

Criteria criteria = sess.createCriteria(Process.class);
criteria
    .createAlias("promoterParty.lawyer", "promoterLawyer")
    .createAlias("promotedParty.lawyer", "promotedLawyer")
    .add(Restrictions.or(
        Restrictions.eq("judge.id", "123"),
        Restrictions.eq("promoterLawyer.id", "123"),
        Restrictions.eq("promotedLawyer.id", "123")
    ));

別名是這里的關鍵，不用擔心123 :)