在hibernate的实体侦听器中更新之前获取原始对象

import org.hibernate.event.spi.PreUpdateEvent;
import org.hibernate.event.spi.PreUpdateEventListener;
import org.hibernate.persister.entity.EntityPersister;

public class MyPreUpdateListener implements PreUpdateEventListener {

    @Override
    public boolean onPreUpdate(PreUpdateEvent event) {
        // 获取原始对象
        Object entity = event.getEntity();
        if (entity instanceof MyEntity) {
            MyEntity originalEntity = (MyEntity) entity;
            // 记录原始状态
            System.out.println("Original state: " + originalEntity.getState());
        }
        return false;
    }

    @Override
    public int getEntityState() {
        return 0;
    }

    @Override
    public boolean requiresPostCommitHanding(EntityPersister persister) {
        return false;
    }
}

import javax.persistence.Entity;
import javax.persistence.EntityListeners;

@Entity
@EntityListeners(MyPreUpdateListener.class)
public class MyEntity {
    // 实体字段和方法
}

<hibernate-configuration>
    <session-factory>
        <!-- 其他配置 -->
        <mapping class="com.example.MyEntity">
            <listener type="pre-update" class="com.example.MyPreUpdateListener"/>
        </mapping>
    </session-factory>
</hibernate-configuration>