org.hibernate.QueryException:不是关联

我想在Hibernate中将order by restriction添加到条件中。 我有两个表Event和MainEvent，它们的关系是一对多（MainEvent有许多事件）

当我尝试运行此程序时，会出现以下错误：

org.hibernate.QueryException:不是关联：日期

主事件实体：

@Entity
@Table(name = "MAIN_EVENT")
public class MainEventEntity {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "MAIN_EVENT_ID")
    private int id;

    @Column(name = "MAIN_EVENT_DATE")
    private Date date;

    @OneToMany(mappedBy = "mainEvent", fetch = FetchType.LAZY, cascade = CascadeType.ALL, orphanRemoval = true)
    private List<EventEntity> events = new ArrayList<EventEntity>();

}

@Entity
@Table(name = "EVENT")
public class EventEntity {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "EVENT_ID")
    private int id;

    @ManyToOne(cascade = CascadeType.PERSIST)
    @JoinColumn(name = "MAIN_EVENT_ID", nullable = false)
    private MainEventEntity mainEvent;

}

根据的API，您可以仅为关联创建别名，而不是为关联的字段创建别名

createAlias

Criteria createAlias(String associationPath,
                     String alias)
                     throws HibernateException
Join an association, assigning an alias to the joined association.



Parameters:
associationPath - A dot-seperated property path
alias - The alias to assign to the joined association (for later reference).
Returns:
this (for method chaining)

---

发布您的实体代码会很高兴看到我们应该在上下文中做什么，而不是从文档中快速粘贴。

createAlias

Criteria createAlias(String associationPath,
                     String alias)
                     throws HibernateException
Join an association, assigning an alias to the joined association.



Parameters:
associationPath - A dot-seperated property path
alias - The alias to assign to the joined association (for later reference).
Returns:
this (for method chaining)

   final Criteria criteria = getCurrentSession().createCriteria(
        Event.class);
criteria.createAlias("mainEvent", "me");
criteria.addOrder(Order.asc("me.deadline"));
return criteria.list();