java - 没有左侧的 DOT 节点使用带连接的 HQL

Question

我正在尝试使用带连接的 hibernate 查询语言在 mySQL 数据库中查找日期列的最大值

@Query("select o.techid, CAST(MAX(o.last_modified) AS DATE) 
   from com.dw.model.user.User as u 
   left join com.dw.model.order.Order as o 
     on u.username=o.techid group by o.techid")
List<User> findUsers();

模型类 =

@Entity(name = "orders")
@Scope("prototype")
@Component
@JsonIdentityInfo(generator = ObjectIdGenerators.IntSequenceGenerator.class)
public class Order {

    @Id
    private long orderNumber;
private Date last_modified;

我收到这个错误:-

Caused by: java.lang.IllegalStateException: DOT node with no left-hand-side!

任何人都可以告诉我如何在 Hibernate 中编写这个来帮助我吗？

Answer 1

删除您的包名称。实体仅由其名称定义。点用于表之间的属性和链接(当定义为 @ManyToOne* 属性时)。

select o.techid, CAST(MAX(o.last_modified) AS DATE) 
   from User as u 
   left join Order as o 
     on u.username=o.techid group by o.techid

编写 HQL 时考虑类和属性，而不是列。