java - hibernate一对多自动添加子对象异常

Question

下面是我的两个具有一对多和多对一关系的实体类。

Parent AuditMst:

public class AuditMst implements Serializable {


    /*@Id
    @Column(name="AUDIT_ID")
    private String auditId;*/

    @Id
    @Column(name="AUDIT_ID")
    @GeneratedValue(strategy=GenerationType.AUTO)
    private long auditId;

    private String action;

    @Column(name="DATE_TIME")
    private Timestamp dateTime;

    //bi-directional many-to-one association to AuditDetail
    @OneToMany(mappedBy = "auditMst", cascade = {CascadeType.ALL })
    private List<AuditDetail> auditDetails;

Child entity: Audit Details

public class AuditDetail implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @Column(name="ID")
    @GeneratedValue(strategy=GenerationType.AUTO)
    private long id;

    @Column(name="FIELD_NAME")
    private String fieldName;

    //bi-directional many-to-one association to AuditMst
    @ManyToOne
    @JoinColumns({
        @JoinColumn(name = "AUDIT_ID", referencedColumnName = "AUDIT_ID")})
    private AuditMst auditMst;

当我尝试添加保存审核 mst 和审核详细信息列表时，hibernate 给出了异常:

o.h.engine.jdbc.spi.SqlExceptionHelper : Column 'AUDIT_ID' cannot be null

这是一对多的关系。我正在使用 spring data jpa 和 hibernate。

在我的审核监听器中:

AuditMst auditMst = new AuditMst();
  auditMst.setAction("add");
for(Object propNameObject : map.keySet()){
AuditDetail auditDetail = new AuditDetail();
String propertyName = (String) propNameObject;
Object property1 = propUtils.getProperty(oldObject, propertyName);
Object property2 = propUtils.getProperty(newObject, propertyName);
 auditDetail.setFieldName(propertyName);
auditDetail.setOldValue(property1.toString());
auditDetail.setNewValue(property2.toString);      
auditDetailList.add(auditDetail);
}
 auditMst.setAuditDetails(auditDetailList);
auditMstService.addAuditMst(auditMst);


ServiceImpl:

@Transactional
    public AuditMst addAuditMst(AuditMst auditMst){
        AuditMst savedAuditMst = auditMstRepository.save(auditMst);
}

Answer 1

您有多对一关系，然后在 AuditDetail 中将 ManyToOne 更改为:

@OneToOne(cascade = CascadeType.ALL)
@JoinColumn(name = "AUDIT_ID")
private AuditMst auditMst;

但请确保您在与实体 AuditDetail 相关的表中创建了 AUDIT_ID 列。并且由于是级联关系，所以只保存AuditMst对象

在你的java代码中:

AuditMst auditMst = new AuditMst();
auditMst.setAction("add");
for(Object propNameObject : map.keySet()){
    AuditDetail auditDetail = new AuditDetail();
    String propertyName = (String) propNameObject;
    Object property1 = propUtils.getProperty(oldObject, propertyName);
    Object property2 = propUtils.getProperty(newObject, propertyName);
    auditDetail.setFieldName(propertyName);
    auditDetail.setOldValue(property1.toString());
    auditDetail.setNewValue(property2.toString);      
    //Here you need to add the original object to make work the on cascade.
    auditDetail.setAuditMst(auditMst);
    auditDetailList.add(auditDetail);
}