Hibernate：外键的列数错误。 应该是 1

Question

我正在尝试 map 到实体 Report 和 ReportLookup：

@Entity
public class Report extends AbstractMigrationObject implements Serializable {
    @JsonIgnore
    @Id
    private Long reportId;
    private String reportName;
    private String appName;
    private Integer reportNum;
    private String issue;
    @JsonProperty
    @OneToMany(fetch = FetchType.EAGER)
    @JoinColumns({
            @JoinColumn(name = "reportName"),
            @JoinColumn(name = "appName"),
    })
    private Set<ReportLookup> lookupSet;

@Entity
public class ReportLookup implements Serializable {
    @JsonIgnore
    @Id
    private Long reportLookupId;
    private String parameterName;
    private String attributeName;
    private String lookupName;
    private Integer sequence;
    private String labelOverride;
    private String defaultValue;
    private Integer required;
    private Integer hidden;
    private String reportName;
    private String operator;
    private Integer multiLookup;
    private Integer reportNum;
    private String appName;
    @ManyToOne
    @JoinColumns({
            @JoinColumn(name = "appName", insertable = false, updatable = false),
            @JoinColumn(name = "reportName", insertable = false, updatable = false)
    })
    private Report report;

我不知道如何 map 复合外键。 总是得到这个错误：

org.springframework.beans.factory.BeanCreationException：在 class 路径资源 [persistance-context.xml] 中定义名称为“entityManagerFactory”的 bean 创建错误：调用 init 方法失败； 嵌套异常是 org.hibernate.AnnotationException: A Foreign key refering ru.ocrv.ekasui.changemonitoring.maximo.entity.report.Report from ru.ocrv.ekasui.changemonitoring.maximo.entity.report.ReportLookup 的列数错误. 应该是 1

Answer 1

我不确定，但您应该尝试使用 Class 的两个 ID 更改您的 @JoinColumns 结构

    @JoinColumns({
        @JoinColumn(name = "reportId", insertable = false, updatable = false),
        @JoinColumn(name = "reportLookupId", insertable = false, updatable = false)
})

Answer 2

抱歉，您不能添加两个具有相同名称的列，如果您想在ReportLookup表中添加一个reportId并在报告表中添加ReportLookup ，请在ReportLookup中删除第二个@JoinColumn ：

@ManyToOne
@JoinColumns({
        @JoinColumn(name = "appName", insertable = false, updatable = false)
})
private Report report; 

并在报告中：

@OneToMany(fetch = FetchType.EAGER)
@JoinColumns({
        @JoinColumn(name = "reportName")
})
private Set<ReportLookup> lookupSet;

第二种解决方案，您应该在主体实体中添加 @JoinColumns

@JsonProperty
@OneToMany(fetch = FetchType.EAGER)
@JoinColumns({
        @JoinColumn(name = "reportName"),
        @JoinColumn(name = "appName"),
})
private Set<ReportLookup> lookupSet;