引用属性在做JPA一对一时未知

Question

我有这两个实体，在其中我想在SQL数据库中使用jpa一对一映射@OnetoOne（在表格中恰好是一个与一个记录相对应的记录中的一个记录在相关表中）

在这里我如何创建@onetoone关系

@Entity
@Table(name = "IMP_Radio")
@NamedQuery(name = "ImpactRadio.findAll", query = "SELECT ia FROM ImpactRadio ia ")
public class ImpactRadio implements Serializable, IEntity<String> {
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    @Id
    @Column(name = "ID")
    private String id;
    @OneToOne(mappedBy = "impactRadio", fetch = FetchType.EAGER)
    @JoinColumn(name = "IA_ID")
    private ImpactRadioAmendment amendments;
    @OneToOne(mappedBy = "impactRadio", fetch = FetchType.EAGER)
    @JoinColumn(name = "IA_ID")
    private ImpactRadioExamination examinations;

}


@Entity
@Table(name = "IMP_Radio_EXAMINATION")
public class ImpactRadioExamination implements Serializable, IEntity<String> {
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    @Id
    @Column(name = "ID")
    private String id;
    @OneToOne(cascade = {CascadeType.PERSIST, CascadeType.REMOVE})
    @JoinColumn(name = "IA_ID")
    private ImpactRadio ImpactRadio;
}

But I have an exception when I try to run a Junit test
Caused by: org.hibernate.AnnotationException: 
Unknown mappedBy in: com.tdk.persistence.fire.model.ImpactRadio.examinations, 
referenced property unknown: com.tdk.persistence.fire.model.ImpactRadioExamination.impactRadio

Answer 1

这是因为您需要传递字段名称：

@OneToOne(mappedBy = "impactRadio", fetch = FetchType.EAGER)
@JoinColumn(name = "IA_ID")
private ImpactRadioAmendment amendments;
@OneToOne(mappedBy = "impactRadio", fetch = FetchType.EAGER)
@JoinColumn(name = "IA_ID")
private ImpactRadioExamination examinations;

实际领域是大写：

@OneToOne(cascade = {CascadeType.PERSIST, CascadeType.REMOVE})
@JoinColumn(name = "IA_ID")
private ImpactRadio ImpactRadio;

将ImpactRadio重命名为impactRadio。