Question

基本上，我的搜索使用的是大sql视图来检索数据，现在我必须将搜索功能扩展到从单独的视图获取的另一个字段。

我遵循了此link中的步骤，但被卡住了。

我想在视图V_FPDA_FILE_RTL_UNT和V_FPDA_FILE_UK_CONTN之间创建多对多关系。

我将表FpdaFileDetail映射到V_FPDA_FILE_RTL_UNT视图。

@Entity(name="FpdaFileDetail")
@Table(name="V_FPDA_FILE_RTL_UNT")
@AttributeOverrides({ @AttributeOverride(name = "id", column = @Column(name = "FPDA_FILE_ID")) })
public class FpdaFileDetail {

...

@ManyToMany
    @Fetch(FetchMode.SUBSELECT)
    @JoinTable(name = "V_FPDA_FILE_UK_CONTN", joinColumns = { @JoinColumn(name = "FPDA_FILE_ID") }, inverseJoinColumns = {@JoinColumn(name = "UK_CMPT_CONTN_ID")})
    public Set<UkComponentContent> getUkContentIds() {
        return ukContentIds;
    }

    public void setUkContentIds(Set<UkComponentContent> ukContentIds) {
        this.ukContentIds = ukContentIds;

}

我创建的多对多关系是这样制作的：

@Entity
@Table(name="UK_CONTN")
@AttributeOverrides({ @AttributeOverride(name = "id", column = @Column(name = "UK_CONTN_ID")) })
public class UkContent {

    private static final long serialVersionUID = 1L;
    private String contentId;
    private Set<UkComponentContent> ukComponentContents;


    @Column(name = "UK_CONTN")
    public String getContentId() {
        return contentId;
    }

    public void setContentId(String contentId) {
        this.contentId = contentId;
    }

    @OneToMany(
            mappedBy = "ukContent",
            cascade = CascadeType.ALL,
            orphanRemoval = true
        )
    public Set<UkComponentContent> getUkComponentContents() {
        return ukComponentContents;
    }

    public void setUkComponentContents(Set<UkComponentContent> ukComponentContents) {
        this.ukComponentContents = ukComponentContents;
    }

}

@Entity(name = "FpdaFile")
@Table(name = "FPDA_FILE")
@AttributeOverrides({ @AttributeOverride(name = "id", column = @Column(name = "FPDA_FILE_ID")) })
public class FpdaFile {
...
    private Set<UkComponentContent> ukContentIds = new HashSet<UkComponentContent>(0);

        @OneToMany(mappedBy = "fpdaFile")
    public Set<UkComponentContent> getUkContentIds() {
        return ukContentIds;
    }

    public void setUkContentIds(Set<UkComponentContent> ukContentIds) {
        this.ukContentIds = ukContentIds;
    }

}

@Entity
@Table(name="UK_CMPT_CONTN")
@AttributeOverrides({ @AttributeOverride(name = "id", column = @Column(name = "UK_CMPT_CONTN_ID")) })
public class UkComponentContent extends BaseEntity {
    private FpdaFile fpdaFile;
    private UkContent ukContent;

    @ManyToOne
    @JoinColumn(name = "FPDA_FILE_ID")
    public FpdaFile getFpdaFile() {
        return fpdaFile;
    }

    public void setFpdaFile(FpdaFile fpdaFile) {
        this.fpdaFile = fpdaFile;
    }

    @ManyToOne
    @JoinColumn(name = "UK_CONTN_ID")
    public UkContent getUkContent() {
        return ukContent;
    }
    public void setUkContent(UkContent ukContent) {
        this.ukContent = ukContent;
    }


}

问题是，如果我让这样的代码执行，则搜索将无法进行，但不会引发任何错误。通过调试，我意识到，如果我对此进行评论（来自FpdaFileDetail）。

@ManyToMany
    @Fetch(FetchMode.SUBSELECT)
    @JoinTable(name = "V_FPDA_FILE_UK_CONTN", joinColumns = { @JoinColumn(name = "FPDA_FILE_ID") }, inverseJoinColumns = {@JoinColumn(name = "UK_CMPT_CONTN_ID")})
    public Set<UkComponentContent> getUkContentIds() {
        return ukContentIds;
    }

    public void setUkContentIds(Set<UkComponentContent> ukContentIds) {
        this.ukContentIds = ukContentIds;

搜索将起作用。但是，如果不加注释，它将无法正常工作。

欢迎提出任何想法！

如何在2个视图之间映射多对多关系？

0 个答案: