Question

民间！

如果我定义一个实体类并使用@MappedSuperclass和@EntityListener注释它，那么是否也会在子类中调用生命周期事件的监听器？

示例：

@MappedSuperclass
@EntityListeners(class=LastUpdateListener.class)
public abstract class Animal {
    @Id private Integer id;
    private String name;
    private Calendar dateOfBirth;
    @Transient private int age;
    private Date lastUpdate;
    //getters and setters

    /**
     * Set my transient property at load time based on a calculation,
     * note that a native Hibernate formula mapping is better for this purpose.
     */
    @PostLoad
    public void calculateAge() {
        Calendar birth = new GregorianCalendar();
        birth.setTime(dateOfBirth);
        Calendar now = new GregorianCalendar();
        now.setTime( new Date() );
        int adjust = 0;
        if ( now.get(Calendar.DAY_OF_YEAR) - birth.get(Calendar.DAY_OF_YEAR) < 0) {
            adjust = -1;
        }
        age = now.get(Calendar.YEAR) - birth.get(Calendar.YEAR) + adjust;
    }
}

public class LastUpdateListener {
    /**
     * automatic property set before any database persistence
     */
    @PreUpdate
    @PrePersist
    public void setLastUpdate(Cat o) {
        o.setLastUpdate( new Date() );
    }
}

感谢。

Answer 1

是的，在映射的超类中使用@PostLoad注释的方法和LastUpdateListener的实体侦听器方法被调用。

映射超类本身的生命周期事件甚至不存在。像往常一样，它适用于子类。

@EntityListener也适用于@MappedSuperclass吗？

1 个答案: