springboot+jpa 无法save父类中的属性

Question

1、父类

@Embeddable
@Inheritance(strategy = JOINED)
public abstract class BaseEntity implements Serializable {

    private static final long serialVersionUID = 1L;
    @Column
    @Temporal(TemporalType.TIMESTAMP)
    private Date createDate;
    @Column
    @Temporal(TemporalType.TIMESTAMP)
    private Date updateDate;
    ...
    //省去get\set
    }

2、子类

@Entity
@Table(name = "user")
public class UserEntity extends BaseEntity implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;

    private String user;

    private String password;

    private String role;

    private String tel;

    private String mail;
    ...
    }

3、Repository接口

@Repository
public interface UserRepository extends CrudRepository<UserEntity , Long> {

    public UserEntity save(UserEntity user);
    }
``
4、controller中调用save方法的时候，

user.setCreateDate(new Date());

这个方法最终并没有被save进去，不知打为何

下面是springboot打印的日子

Hibernate: insert into user (mail, password, role, tel, user) values (?, ?, ?, ?, ?)
com.example.demo.entity.UserEntity@78730d83

可以看到里面并没有createDate

Answer 1

基类BaseEntity加上@MappedSuperclass注解，包javax.persistence.MappedSuperclass
可以参考 JPA @MappedSuperclass 注解说明