【发布时间】:2011-12-17 17:24:45
【问题描述】:
伙计们!
如果我定义一个实体类并使用@MappedSuperclass 和@EntityListener 对其进行注释,是否还会调用侦听器来处理子类中的生命周期事件?
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。
【问题讨论】:
标签: hibernate jpa annotations entitylisteners