Java 带LeftJoin的SpringData分页投影与JPA2.1

我有一个2.1.4.0版本的项目，其中包含spring引导数据

本项目具有以下关系实体： 应用性 ApplicationTranslateEntity 语言实体 它是数据库中的一个区域设置关系表（ManyToMany），在该表中为不同语言的定位文本提供了额外的表（ApplicationTranslateEntity）

应用性：

    @Getter
    @Setter
    public class ApplicationEntity {

    @Id
    private Long id;

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

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

}

@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;

}

public interface ApplicationProjection {

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

 @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);

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

投影：

    @Getter
    @Setter
    public class ApplicationEntity {

    @Id
    private Long id;

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

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

}

@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;

}

public interface ApplicationProjection {

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

 @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);

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

带有查询的存储库：

    @Getter
    @Setter
    public class ApplicationEntity {

    @Id
    private Long id;

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

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

}

@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;

}

public interface ApplicationProjection {

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

 @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);

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

@Query（“选择a.id作为id，a.urlImage作为urlImage，at.name作为name，at.description作为ApplicationEntity的描述a左连接a.applicationTranslationEntities at.language.key=：language”）
PageFindAllByLanguage（可分页，可分页语言）；

Rest控制器应用程序：

    @Getter
    @Setter
    public class ApplicationEntity {

    @Id
    private Long id;

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

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

}

@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;

}

public interface ApplicationProjection {

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

 @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);

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

@GetMapping（）
Page all（Pageable Pageable，@RequestHeader（value=headerAcceptencode，required=false）语言{
返回applicationService.findAll（可分页，语言）；
}

分页和id排序都很好。但当我尝试按名称排序时，它位于ApplicationTranslationEntity上，我看到hibernate尝试在ApplicationEntity中而不是ApplicationTranslationEntity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：******实体.ApplicationEntity[选择a.id作为id，a.urlImage作为urlImage，a.urlStoreiOS作为urlStoreiOS，a.urlstoreadroid作为urlstoreadroid，at.name作为名称，at.description作为描述，从******.entity.ApplicationEntity.ApplicationEntity a左连接a.applicationTranslationEntity at at on.language.key=：a.id asc的语言顺序，a.name asc]；嵌套异常为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作为urlStoreiOS，a.urlstoreadroid作为urlstoreadroid，at.name作为名称，at.description作为描述，从*********.entity.ApplicationEntity.ApplicationEntity a左连接a.applicationTranslationEntity at at on.language.key=：a.id asc的语言顺序，a.name asc]

---

您正在使用

name

的分页属性，而它应该是

applicationTranslationEntities.name

（属性路径）或

a.name

（根据连接路径）中的（idk哪一个是正确的）.

你用来构建Pageable的分页属性是什么？在其他作品中，展示了你是如何创建Pageable的我编辑了这个问题，我使用了导入org.springframework.data.domain.Page并且我没有在Pageable中更改任何内容。很好，但我仍然不知道你用于分页的参数是什么。它包含属性名。和at是我感兴趣的关于at.name的工作很好谢谢，我可以做些什么来改变这个？但是为什么你要改变它？我想用页面中的sort来改变name参数，使用字段的名称而不使用数据库的别名，因为如果我在查询中改变了一些东西，可能用户不能很好地使用这个sort字段，那么你将不得不映射列names从视图到自己在查询中使用的列名。