创建包含多个主键的Join表？

Question

创建包含多个主键的连接表时出现问题。下面是我的表结构：

以下是我的JPA实施：

@Entity
@Table(name = "label")
public class Label {
    @Id
    @Column(name = "tenant_id")
    private String tenant_id;

    @Id
    @Column(name = "label_id")
    private String label_id;

    @JsonIgnore
    @ManyToMany(targetEntity = Report.class, cascade = { CascadeType.PERSIST, CascadeType.MERGE })
    @JoinTable(name = "tagging", joinColumns = @JoinColumn(name = "label_id"), inverseJoinColumns = @JoinColumn(name = "report_id"))
    private Set<Report> reports;
}

@Entity
@Table(name = "report")
public class Report {
    @Id
    @Column(name = "tenant_id")
    private String tenant_id;

    @Id
    @Column(name = "report_id")
    private String report_id;

    @column(name = "created_by")
    private String created_by;

    @JsonIgnore
    @ManyToMany(targetEntity = Label.class, cascade = { CascadeType.PERSIST, CascadeType.MERGE })
    @JoinTable(name = "tagging", joinColumns = @JoinColumn(name = "report_id"), inverseJoinColumns = @JoinColumn(name = "label_id"))
    private Set<Label> labels;

}

这很好用，但是当我尝试将tenant_id添加到混合中时如下：

Label.java编辑：

@JoinTable(name = "tagging", joinColumns = @JoinColumn(name = "label_id"), inverseJoinColumns = { @JoinColumn(name = "report_id"), @JoinColumn(name = "tenant_id") })
private Set<Report> reports;

Report.java编辑：

@JoinTable(name = "tagging", joinColumns = @JoinColumn(name = "report_id"), inverseJoinColumns = { @JoinColumn(name = "label_id"), @JoinColumn(name = "tenant_id") })
private Set<Label> labels;

我收到错误消息“A Foreign key refering has the wrong number of column. should be 1”。据我了解，这是因为我只有一个名为Report的主键和每个标签，因此我无法将tenant_id映射为JoinColumn。但是，我想知道，当设置tenant_id和report_id时，有没有办法设置label_id？任何帮助，将不胜感激。谢谢！

编辑：实体中的@Id字段在报告和标签类中都是tenant_id和id。

Answer 1

对不起，我无法尝试这一点，但从头顶来看，就是这样的。有一些东西需要修复，比如完整的注释属性，因为列名和类成员不一样，但这就是想法。 ：）

更多信息here

报告类

@Entity
public class Report {

    @Id
    private Integer id;

    @Column
    private String createdBy;

    @Column
    private String tenantId;

    @OneToMany
    private List<Tagging> taggings = new ArrayList<>();

    // getter and setters

}

标签类

@Entity
public class Label {

    @Id
    private Integer id;

    @Column
    private String tenantId;

    @OneToMany
    private List<Tagging> taggings = new ArrayList<>();

    // getter and setters

}

标记类

@Entity
public class Tagging {

    @EmbeddedId
    private TaggingId id;

    @OneToMany
    private Report report;

    @OneToMany
    private Label label;

    // getter and setters

}

@Embeddable
class TaggingId {

    private Integer reportId;

    private String labelId;

    private String tenantId;

    // getter and setters

}