@EntityListener 是否也适用于 @MappedSuperclass? [英] Does @EntityListener works with @MappedSuperclass as well?

问题描述

伙计们！

如果我定义了一个实体类并使用 @MappedSuperclass 和一个 @EntityListener 对其进行注释，那么在子类中是否也会调用侦听器来处理生命周期事件?

示例:

@MappedSuperclass@EntityListeners(class=LastUpdateListener.class)公共抽象类动物{@Id 私有整数 id；私有字符串名称；私人日历 dateOfBirth;@Transient 私有整数年龄；私人日期 lastUpdate;//getter 和 setter/*** 根据计算在加载时设置我的瞬态属性，* 请注意，本机 Hibernate 公式映射更适合此目的.*/@PostLoad公共无效计算年龄(){日历诞生 = new GregorianCalendar();出生时间(出生日期)；现在日历 = new GregorianCalendar();now.setTime(新日期());int 调整 = 0;if ( now.get(Calendar.DAY_OF_YEAR) -birth.get(Calendar.DAY_OF_YEAR) <0) {调整 = -1;}age = now.get(Calendar.YEAR) -birth.get(Calendar.YEAR) + adjust;}}公共类 LastUpdateListener {/*** 在任何数据库持久化之前设置自动属性*/@预更新@PrePersist公共无效 setLastUpdate(Cat o) {o.setLastUpdate(new Date());}}

谢谢.

解决方案

是的，映射超类中用 @PostLoad 注释的方法和 LastUpdateListener 的实体侦听器方法被调用.

像映射超类本身的生命周期事件这样的事情甚至不存在.像往常一样，它适用于子类.

Folks!

If I define an Entity Class and annotate it with @MappedSuperclass and an @EntityListener, does the listener also get called for lifecycle events within a child class?

Example:

@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() );
    }
}

Thanks.

解决方案

Yes, method annotated with @PostLoad in mapped superclass and LastUpdateListener's entity listener methods get called.

Such a thing as lifecycle event for mapped superclass itself does not even exist. As usual, it applies to subclass.

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