进行 JPA 一对一时引用的属性未知

Question

我有这两个实体，我想在进行 JPA 一对一时使用将@OneToOne 映射到 SQL 数据库中（表中的一条记录恰好对应于相关表中的一条记录）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 testCaused 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

这是因为在这里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;

而真正的字段是大写的：

@OneToOne(cascade = {CascadeType.PERSIST, CascadeType.REMOVE})

@JoinColumn(name = "IA_ID")

private ImpactRadio ImpactRadio;

重命名ImpactRadio为impactRadio.