Java 如何将Hibernate自定义包装器对象映射为多个关系？

我试图从一个数据库中收集数据，其中图像和项目类之间有很多关系，我需要从数据库中获取图像列表，并将结果映射到一个包含其他值的包装类中， 但问题是，我无法将多个关系的结果列表映射到该包装器中，因为我无法进行join

以下是项目实体：

@Entity
@Table(name = "item")
public class Item implements Serializable {

private static final long serialVersionUID = 1L;

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id", nullable = false)
private Long id;

@ManyToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
@JoinTable(name = "item_image", joinColumns = @JoinColumn(name = "item_id"), inverseJoinColumns = @JoinColumn(name = "image_id"))
private Set<Image> images;}

这是包装器类，我需要从数据库中获取设置的图像值：

public class ItemWrapper {
private Long id;
private Long subcategoryId;
private String name;
private String sectionNumber;
private boolean featured = false;
private boolean viewed = true;
private boolean favoured = false;
private String enDescription;

private String arDescription;

@JsonFormat(pattern = "yyyy-MM-dd", timezone = "UTC")
private LocalDate startDate;

@JsonFormat(pattern = "yyyy-MM-dd", timezone = "UTC")
private LocalDate endDate;

private Boolean isNew = false;

private String comment;

private Boolean active = true;

private Set<Image> images;

public ItemWrapper(Long id,
                   Long subcategoryId,
                   String sectionNumber,
                   boolean featured,
                   String enDescription,
                   String arDescription,
                   String name,
                   LocalDate startDate,
                   LocalDate endDate,
                   Boolean isNew,
                   String comment,
                   Boolean active,
                   boolean viewed,
                   boolean favoured,
                   Set<Image> images
) {
    this.id = id;
    this.subcategoryId = subcategoryId;
    this.sectionNumber = sectionNumber;
    this.featured = featured;
    this.enDescription = enDescription;
    this.arDescription = arDescription;
    this.name = name;
    this.startDate = startDate;
    this.endDate = endDate;
    this.isNew = isNew;
    this.comment = comment;
    this.active = active;
    this.viewed = viewed;
    this.favoured = favoured;
    this.images = images;  }}

public类ItemWrapper{
私人长id；
私有长子类别ID；
私有字符串名称；
私有字符串段号；
私有布尔值=false；
私有布尔值=真；
private boolean favored=false；
私有字符串描述；
私有字符串描述；
@JsonFormat（pattern=“yyyy-MM-dd”，timezone=“UTC”）
私有LocalDate开始日期；
@JsonFormat（pattern=“yyyy-MM-dd”，timezone=“UTC”）
私有LocalDate-endDate；
私有布尔值isNew=false；
私有字符串注释；
private Boolean active=true；
私人设置图像；
公共ItemWrapper（长id，
长子类别ID，
字符串节号，
布尔特征，
字符串描述，
字符串描述，
字符串名，
LocalDate开始日期，
LocalDate endDate，
布尔值是新的，
字符串注释，
布尔活动，
从布尔值来看，
我赞成，
设置图像
) {
this.id=id；
this.subcategoryId=子类别ID；
this.sectionNumber=sectionNumber；
特色的；特色的；
this.endDescription=endDescription；
this.arDescription=arDescription；
this.name=名称；
this.startDate=startDate；
this.endDate=endDate；
this.isNew=isNew；
this.comment=注释；
这个.active=active；
this.viewed=已查看；
this.favored=favored；
this.images=images；}

这是我试图在注释行中的两个实体之间创建联接表的存储库接口，我需要在构造函数中设置最后一个参数：

public interface ItemRepository extends JpaRepository<Item, Long> {

final String GET_ITEM_BY_ID = "SELECT new com.suncodex.elepedia.wrapper.ItemWrapper("
        + " it.id, it.subcategory.id, "
        + " it.sectionNumber, "
        + " it.featured, "
        + " it.enDescription, "
        + " it.arDescription, "
        + " gi.name, "
        + " gi.startDate, "
        + " gi.endDate, "
        + " gi.isNew, "
        + " gi.comment, "
        + " gi.active, "
        + " usd.viewed, "
        + " usd.favoured, "
        + " it.images) "
        + " FROM Item it "
        + " LEFT JOIN UserSpecialData usd "
        + " ON usd.generalInfo.id = it.generalInfo.id "
        + " LEFT JOIN it.generalInfo gi "
        //  + " LEFT JOIN ItemImage im "
        //  + " ON im.item.id = it.id "
        + " WHERE usd.user.id =:userId "
        + " AND it.id = :itemId";

@Query(GET_ITEM_BY_ID)
ItemWrapper getItemById(@Param("itemId") long itemId, @Param("userId") long userId);}

public interface ItemRepository扩展了JpaRepository{
最后一个字符串GET_ITEM_BY_ID=“SELECT new com.suncodex.elepedia.wrapper.ItemWrapper（”
+it.id，it.subcategory.id
+“它是一个数字，”
+“它是我的特色，”
+“它是一种描述，”
+“这是我的描述，”
+“gi.name，”
+“开始日期，”
+“gi.endDate，”
+“我是新来的，”
+“gi.comment，”
+“gi.active，”
+“美元，”
+“美元优惠，”
+“it.images）”
+“从项目it”
+“LEFT JOIN UserSpecialData usd”
+“ON usd.generalInfo.id=it.generalInfo.id”
+“LEFT JOIN it.generalInfo gi”
//+“左连接项图像im”
//+“ON im.item.id=it.id”
+“其中usd.user.id=：userId”
+“AND it.id=：itemId”；
@查询（按项目ID获取项目）
ItemWrapper getItemById（@Param（“itemId”）long itemId，@Param（“userId”）long userId）；}

public interface ItemRepository extends JpaRepository<Item, Long> {

final String GET_ITEM_BY_ID = "SELECT new com.suncodex.elepedia.wrapper.ItemWrapper("
        + " it.id, it.subcategory.id, "
        + " it.sectionNumber, "
        + " it.featured, "
        + " it.enDescription, "
        + " it.arDescription, "
        + " gi.name, "
        + " gi.startDate, "
        + " gi.endDate, "
        + " gi.isNew, "
        + " gi.comment, "
        + " gi.active, "
        + " usd.viewed, "
        + " usd.favoured, "
        + " it.images) "
        + " FROM Item it "
        + " LEFT JOIN UserSpecialData usd "
        + " ON usd.generalInfo.id = it.generalInfo.id "
        + " LEFT JOIN it.generalInfo gi "
        //  + " LEFT JOIN ItemImage im "
        //  + " ON im.item.id = it.id "
        + " WHERE usd.user.id =:userId "
        + " AND it.id = :itemId";

@Query(GET_ITEM_BY_ID)
ItemWrapper getItemById(@Param("itemId") long itemId, @Param("userId") long userId);}