子表中未自动生成外键

Question

• 我有两个实体，其中第一个实体的主键是第二个实体的外键。
• 当我保存父级时，我的外键没有设置，所以我想知道为什么它没有被自动设置。

父实体ExcpType.java

@Getter
@Setter
@Entity
@Table(name = "mst_excp_type")
public class ExcpType implements Serializable {
    private static final long serialVersionUID = 1L;
    
    @Id
    @Column(name = "mst_excp_type_id",columnDefinition = "bigint", unique = true, nullable = false)
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    protected Integer mstExcpTypeId;

    @Column(name = "type_id")
    protected String typeId;
    
    @Column(name = "excp_type_desc")
    protected String excpTypeDesc;
    
    @Column(name = "status")
    protected String status;
    
    @Column(name = "sequence")
    protected Integer sequence;
    
    @Column(name = "excp_type_desc_ar", columnDefinition = "nvarchar(100)")
    protected String excpTypeDescAr;
    
     // One-to-one relationship with ExcpFor
    @OneToOne(mappedBy = "excpType", cascade = CascadeType.ALL)
    private ExcpFor excpFor;
    
    
    @Embedded
    protected AuditDetails auditDetails;

子实体 ExcpFor.java

@Getter
@Setter
@Entity
@Table(name = "mst_excp_for")
public class ExcpFor implements Serializable {
    private static final long serialVersionUID = 1L;
    
    @Id
    @Column(name = "mst_excp_for_id",columnDefinition = "bigint", unique = true, nullable = false)
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    protected Integer mstExcpForId;

    @Column(name = "mst_excp_type_id", unique = true, nullable = false, columnDefinition = "bigint")
    protected Integer mstExcpTypeId;
    
    @Column(name = "ln_no")
    protected Integer lnNo;
    
    @Column(name = "excp_for_code")
    protected String excpForCode;
    
    @Column(name = "excp_for_desc")
    protected String excpForDesc;
    
    @Column(name = "excp_for_desc_ar", columnDefinition = "nvarchar(100)")
    protected String excpForDescAr;
    
    
    @OneToOne
    @JoinColumn(name = "mst_excp_type_id", referencedColumnName = "mst_excp_type_id", insertable=false, updatable=false)
    private ExcpType excpType;
    
    @Embedded
    protected AuditDetails auditDetails;

我尝试了 @MapsId 注释，但效果不佳

下面是我在父对象中设置子对象，然后保存父对象的部分。

        ExcpType excpType = new ExcpType();
        ExcpFor excpFor = new ExcpFor();
        
        excpFor.setExcpForCode(form.getExcpTypeVo().getExcpFor());
        excpType.setExcpFor(excpFor);
        
        excpType.setTypeId(form.getExcpTypeVo().getTypeId());
        excpType.setExcpTypeDesc(form.getExcpTypeVo().getExcpTypeDesc());
        excpType.setExcpTypeDescAr(form.getExcpTypeVo().getExcpTypeDescAr());
        excpType.setStatus(form.getExcpTypeVo().getStatus());
        excpType.setAuditDetails(audit);
        excpTypeDao.saveOrUpdateExcpType(excpType);

下面是我的 Dao 中负责将实体持久保存到数据库的片段。

getHibernateTemplate().saveOrUpdate(excpType);

最后这是我得到的错误

Caused by: org.hibernate.PropertyValueException: not-null property references a null or transient value: com.eanda.smarttime.model.ExcpFor.mstExcpTypeId 

Answer 1

发生错误是因为您在 mst_excp_type_id 表中的

mst_excp_for

列上声明了

NOT NULL

约束。但是，当您保存

ExcpFor

实体时，您会将

mstExcpTypeId

字段留空。

要解决问题，请删除代码

@Id
@Column(name = "mst_excp_for_id",columnDefinition = "bigint", unique = true, nullable = false)
@GeneratedValue(strategy=GenerationType.IDENTITY)
protected Integer mstExcpForId;

@Column(name = "mst_excp_type_id", unique = true, nullable = false, columnDefinition = "bigint")
protected Integer mstExcpTypeId;

并将

excpType

类中

ExcpFor

字段的描述更改为以下内容：

@Id
@OneToOne
@JoinColumn(name = "mst_excp_type_id", insertable=false, updatable=false)
private ExcpType excpType;