Java 完成删除和插入异常

我有一个问题，需要执行完全删除，然后插入。 尝试过一种方法，可以建议有没有其他更好的方法

{   
  "incidentTime": 1491207083634,
  "estCode": 152,
  "incidentParamTrans": [
    {      
      "paramValueList": [
        11,
        12,
        14
      ]
    }
  ]
}

这是主实体类

@Entity
@Table(name="IR_TB_INCIDENT_HDR")
public class IncidentHdr implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @SequenceGenerator(name="IR_TB_INCIDENT_HDR_INCIDENTID_GENERATOR", sequenceName="IR_SEQ_INCIDENT_ID")
    @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="IR_TB_INCIDENT_HDR_INCIDENTID_GENERATOR")
    @Column(name="INCIDENT_ID")
    private long incidentId;

    @OneToMany(cascade = {CascadeType.PERSIST,CascadeType.MERGE, CascadeType.REMOVE}, fetch = FetchType.LAZY,  mappedBy="incidentHdr")
    private Set<IncidentParamTran>  incidentParamTrans;

    public IncidentHdr() {
    }

}

如果输入是这样的

{   
  "incidentId": 4700,
  "incidentTime": 1491207083634,
  "estCode": 152,
  "incidentParamTrans": [
    {      
      "paramValueList": [
        10,
        14,
      ]
    }
  ]
}

必须删除IncidentParamTrans表中的所有数据，事件Id为4700。其中，事件Id不是主键

之后，我必须将所有新记录（2条记录）插入IncidentParamTrans

执行完全删除并执行新插入，这反过来引发刷新异常

我试过的代码

服务层代码段

@Override
    @Transactional(rollbackFor=IncidentReportingException.class)
    public IncidentHdrDto saveIncidentReport(IncidentHdrDto incidentHdrDto)
    if(incidentHdrDto.getIncidentParamTrans()!= null ){
            Set<IncidentParamTranDto> incidentParamTranDtos = new HashSet<IncidentParamTranDto>();
        //  dto.getSensitivityPattern().remove
            IncidentHdr inc = mapper.map(incidentHdrDto, IncidentHdr.class);
            incidentParamTransRepo.deleteByIncidentHdr(inc);

            for(IncidentParamTranDto item:incidentHdrDto.getIncidentParamTrans()){

                if(item != null){
                    for(BigDecimal paramItem: item.getParamValueList()){
                        IncidentParamTranDto val = new IncidentParamTranDto();
                        val.setParamId(paramItem);
                        val.setIncidentHdr(incidentHdrDto);
                        incidentParamTranDtos.add(val);
                    }
                }
            }
            incidentHdrDto.setIncidentParamTrans(incidentParamTranDtos);
        }

        result = saveIncidentHdr(incidentHdrDto);
        }

---

我认为它失败的原因是，

IncidentHdr.incidentParamTrans

收集仍然处于无效状态，因为实际删除事件参数是由

incidentparamtransrop.deleteByIncidentHdr（inc）处理的；

存储库调用，但另一方面，CRUD操作的所有权通过级联行为配置在

IncidentHdr.incidentParamTrans

上设置

为避免混淆，我建议尝试以下方法：

首先将“IncidentHdr.incidentParamTrans”转换为DTO供以后使用

清除

IncidentHdr.incidentParamTrans

集合：

inc.getIncidentParamTrans（）.Clear（）

使用刷新来保存IncidentHdr：

IncidentHdr还原。**saveAndFlush**（inc）

。这将触发使用手动存储库调用执行的删除查询。使用刷新执行save非常重要，因此在再次填充集合之前，此时将执行实际的删除查询

再次填写“IncidentHdr.incidentParamTrans”并保存它

这种方法的优点是Hibernate可以跟踪对

IncidentHdr.incidentParamTrans

集合所做的所有更改，并确保正确处理状态。 这种方法的一个缺点是它会将整个

IncidentHdr.incidentParamTrans

集合加载到内存中，但是，根据您的配置，我认为这应该不是问题，因为您已经这样做了（通过将

IncidentHdr.incidentParamTrans

的CRUD管理委托给

IncidentHdr

实体）

希望这有帮助

@Override
    @Transactional(rollbackFor=IncidentReportingException.class)
    public IncidentHdrDto saveIncidentReport(IncidentHdrDto incidentHdrDto)
    if(incidentHdrDto.getIncidentParamTrans()!= null ){
            Set<IncidentParamTranDto> incidentParamTranDtos = new HashSet<IncidentParamTranDto>();
        //  dto.getSensitivityPattern().remove
            IncidentHdr inc = mapper.map(incidentHdrDto, IncidentHdr.class);
            incidentParamTransRepo.deleteByIncidentHdr(inc);

            for(IncidentParamTranDto item:incidentHdrDto.getIncidentParamTrans()){

                if(item != null){
                    for(BigDecimal paramItem: item.getParamValueList()){
                        IncidentParamTranDto val = new IncidentParamTranDto();
                        val.setParamId(paramItem);
                        val.setIncidentHdr(incidentHdrDto);
                        incidentParamTranDtos.add(val);
                    }
                }
            }
            incidentHdrDto.setIncidentParamTrans(incidentParamTranDtos);
        }

        result = saveIncidentHdr(incidentHdrDto);
        }

    @Override
    public IncidentHdrDto saveIncidentHdr(IncidentHdrDto incidentHdrDto)
            throws IncidentReportingException {
        return mapper.map(iReportingRepo.save(mapper.map(incidentHdrDto, IncidentHdr.class)),IncidentHdrDto.class);
    }

Repo class used to delete 

    public interface IncidentParamTransRepo extends JpaRepository<IncidentParamTran, Long> {



    Long deleteByIncidentHdr(IncidentHdr inc);

}

org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: om.gov.moh.irs.model.entity.incident.IncidentHdr