获取有关Spring Data数据的最后记录 [英] Get last records ordered by data on Spring Data
问题描述
我正在尝试在Spring Data存储库中定义一个方法来获取按日期排序的表上的最后记录。这是我的实体:
I'm trying to define a method in a Spring Data repository to fetch the last records on a table ordered by date. This is my entity:
@Entity
public class News {
@Id
@GeneratedValue
private Long id;
@Column(nullable = false)
private String title;
@Column(nullable = false)
private String text;
private Date publicationDate;
/* Getters and Setters */
}
这是我的存储库:
public interface NewsRepository extends JpaRepository<News, Long> {
List<News> findFirst5OrderByPublicationDateDesc();
}
如果我尝试使用启动项目,我会收到下一个错误:
If I try to use launch the project I get the next error:
引起:
org.springframework.data.mapping.PropertyReferenceException:找不到类型为Date的
属性desc!遍历路径:News.publicationDate。
Caused by: org.springframework.data.mapping.PropertyReferenceException: No property desc found for type Date! Traversed path: News.publicationDate.
如果我删除了描述我得到了这个:
And if I remove the Desc I get this:
引起:java.util.NoSuchElementException
Caused by: java.util.NoSuchElementException
我做错了什么?
推荐答案
原来该方法的签名不正确。正确的是:
Turns out that the signature of the method was incorrect. The right one is:
findFirst5ByOrderByPublicationDateDesc()
有点令人困惑,因为在官方样本中他们有这个:
Is a little confusing because in the official samples they have this:
List<User> findTop10ByLastname(String lastname, Pageable pageable);
正如你所看到的那样只有一个By,通常的那个。
As you can see there is only one By there, the usual one.
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