hibernate - @EntityListener 是否也适用于 @MappedSuperclass？

Question

伙计们!

如果我定义一个实体类并用 @MappedSuperclass 注释它和一个 @EntityListener ，在子类中是否还会调用监听器来处理生命周期事件？

例子:

@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() );
    }
}

谢谢。

Answer 1

是的，在映射的父类(super class)中用 @PostLoad 注释的方法和 LastUpdateListener 的实体监听器方法被调用。

映射父类(super class)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。