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弹簧数据JPA从OneToMany关系按值排序_Jpa_Spring Data Jpa_Spring Data_Querydsl - Fatal编程技术网

弹簧数据JPA从OneToMany关系按值排序

弹簧数据JPA从OneToMany关系按值排序,jpa,spring-data-jpa,spring-data,querydsl,Jpa,Spring Data Jpa,Spring Data,Querydsl,我正在尝试按嵌套集合元素值对结果进行排序。我有一个非常简单的模型: @Entity public class User { @Id @NotNull @Column(name = "userid") private Long id; @OneToMany(mappedBy = "user") private Collection<Setting> settings = new HashSet<>(); // g

我正在尝试按嵌套集合元素值对结果进行排序。我有一个非常简单的模型:

@Entity
public class User {

    @Id
    @NotNull
    @Column(name = "userid")
    private Long id;

    @OneToMany(mappedBy = "user")
    private Collection<Setting> settings = new HashSet<>();

    // getters and setters
}

@Entity
public class Setting {

    @Id
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "userid")
    private User user;

    private String key;
    private String value;

    // getters and setters
}

public interface UserRepository extends JpaRepository<User, Long>, QuerydslPredicateExecutor<User> {
}
@实体
公共类用户{
@身份证
@NotNull
@列(name=“userid”)
私人长id;
@OneToMany(mappedBy=“用户”)
私有集合设置=新HashSet();
//接球手和接球手
}
@实体
公共班级设置{
@身份证
@manytone(fetch=FetchType.LAZY)
@JoinColumn(name=“userid”)
私人用户;
私钥;
私有字符串值;
//接球手和接球手
}
公共接口用户存储库扩展了JpaRepository、QueryDSL谓词执行器{
}
我希望返回的结果按一个设置的值排序。
是否可以使用Spring数据JPA和QueryDSL按user.settings.value排序,其中settings.name='SampleName'?

我使用了
JpaSpecificationExecutor
。例如,让我们看看
findAll

Page<T> findAll(@Nullable Specification<T> spec, Pageable pageable);

但我并不总是希望按此字段排序,有时这是另一个字段,但如何创建sortByProperty以按user.setting.name?sort.Order.asc(“setting.name”)排序
...

Specification<T> whereSpecifications = Specification.where(yourWhereSpeficiation);
Sort sortByProperty = Sort.by(Sort.Order.asc("property"));
PageRequest orderedPageRequest = PageRequest.of(1, 100, sortByProperty);

userRepository.findAll(whereSpecifications, PageRequest.of(page, limit, orderedPageRequest));