Spring Data Pageable Projection with Left Join with JPA2.1

Question

我有一个带有 Spring Boot 数据的 2.1.4.RELEASE 项目。

该项目具有以下关系实体： 应用实体 应用程序翻译实体 语言实体 它是数据库中的一个区域设置关系表（ManyToMany），在该表中具有用于以不同语言定位的文本的额外表（ApplicationTranslateEntity）。

应用实体：

    @Getter
    @Setter
    public class ApplicationEntity {

    @Id
    private Long id;

    private String urlImage;
    private String urlStoreiOS;
    private String urlStoreAndroid;

    @OneToMany(mappedBy = "application")
    Set<ApplicationTranslationEntity> applicationTranslationEntities;

}

ApplicationTranslateEntity：

@Getter
@Setter
public class ApplicationTranslationEntity {
    @EmbeddedId
    ApplicationTranslationKey id;

    @ManyToOne
    @MapsId("application_id")
    @JoinColumn(name = "application_id")
    ApplicationEntity application;

    @ManyToOne
    @MapsId("language_id")
    @JoinColumn(name = "language_id")
    LanguageEntity language;

    @Column(length = 100)
    private String name;

    @Column(length = 1000)
    private String description;

}

投影：

public interface ApplicationProjection {

    Long  getId();
    String getName();
    String getDescription();
    String getUrlImage();
    String getUrlStoreiOS();
    String getUrlStoreAndroid();
}

带有查询的存储库：

 @Query("select  a.id as id, a.urlImage as urlImage, at.name as name, at.description as description  from ApplicationEntity a left join a.applicationTranslationEntities at on at.language.key = :language")
Page<ApplicationProjection> findAllByLanguage(Pageable pageable, Language language);

休息控制器应用程序：

 @GetMapping()
Page<ApplicationDto> all(Pageable pageable, @RequestHeader(value= headerAcceptEncoding, required = false) Language language){
    return applicationService.findAll(pageable,language);
}

分页和排序都可以正常工作。但是当我尝试按 ApplicationTranslationEntities 上的名称进行排序时，我看到休眠尝试在 ApplicationEntity 中而不是在 ApplicationTranslateEntity 中进行排序。 为什么会这样？

错误是：

org.hibernate.QueryException：无法解析属性：名称：******entity.ApplicationEntity [选择 a.id 作为 id，a.urlImage 作为 urlImage，a.urlStoreiOS 作为 urlStoreiOS，a.urlStoreAndroid 作为urlStoreAndroid, at.name as name, at.description as description from ******.entity.ApplicationEntity a left join a.applicationTranslationEntities at on at.language.key = :language order by a.id asc, a.name升序];嵌套异常是 java.lang.IllegalArgumentException：org.hibernate.QueryException：无法解析属性：名称：******.entity.ApplicationEntity [选择 a.id 作为 id，a.urlImage 作为 urlImage，a.urlStoreiOS as urlStoreiOS, a.urlStoreAndroid as urlStoreAndroid, at.name as name, at.description as description from *******.entity.ApplicationEntity a left join a.applicationTranslationEntities at on at.language.key = :language order by a.id asc, a.name asc]

Answer 1

您正在使用name 的分页属性，而它应该是（idk 哪个是正确的）applicationTranslationEntities.name（属性路径）或a.name（根据连接路径）。