在没有加入的情况下使用 JPA 保持 OneToMany 关系 table

Question

我有下表S：

`notification_job_execution`
(`jobId`,
`createdDate`,
`messageBody`)

`notification_task_execution`
(`taskId`,
`jobId`,
`status`,
`createdDate`)

Havin oneToMany 关系车间 (notification_job_execution ,notification_task_execution) (1..n)

我有以下实体

  @Id
    @GeneratedValue(strategy= GenerationType.AUTO)
    private String jobId;
    @Temporal(TemporalType.DATE)
    private Date createdDate;
    private String messageBody;

    @OneToMany(fetch = FetchType.LAZY, mappedBy = "notificationJobEntity", cascade=CascadeType.ALL)
    private Set<NotificationTaskEntity> notificationTaskEntities = new HashSet<NotificationTaskEntity>(
            0);

和：

@Entity
@Table(name = "notification_task_execution")
public class NotificationTaskEntity implements Serializable{

    @Id
    @GeneratedValue(strategy= GenerationType.AUTO)
    private long taskId;

    private int jobId;


    private String status;

    @Temporal(TemporalType.DATE)
    private Date createdDate;

    @ManyToOne(optional = false)
    private NotificationJobEntity notificationJobEntity;

我正在使用 Spring 和 JPA 以坚持这种方式：

  NotificationJobEntity notificationJobEntity=new NotificationJobEntity();
        notificationJobEntity.setCreatedDate(new Date());
        notificationJobEntity.setMessageBody("hello youu");


          NotificationTaskEntity notificationTaskEntity=new NotificationTaskEntity();
          notificationTaskEntity.setCreatedDate(new Date());
          notificationTaskEntity.setStatus("success");
          notificationTaskEntity.setNotificationJobEntity(notificationJobEntity);

        notificationTaskEntity.setNotificationJobEntity(notificationJobEntity);
        notificationJobEntity.getNotificationTaskEntities().add(notificationTaskEntity);

        notificationDao.save(notificationJobEntity);

我在数据库中看不到子记录持续存在（即 notificationTaskEntity）。

我如何才能持久化父级并在后台将 notificationTaskEntity 也持久化到数据库？

Answer 1

您必须在 NotificationTaskEntity

中指定 CascadeType

@ManyToOne(optional = false,CascadeType.PERSIST)
    private NotificationJobEntity notificationJobEntity;

Answer 2

我认为您可能只需要添加 @JoinColumn 注释以指示数据库中的哪个字段 table 代表 NotificationTaskEntity.

的 ID

@ManyToOne(optional = false)
@JoinColumn(name = "jobid")
private NotificationJobEntity notificationJobEntity;

在没有加入的情况下使用 JPA 保持 OneToMany 关系 table

Persisting OneToMany relationship Using JPA without Join table

database

spring

hibernate

jpa

spring-data