onFlushDirty()的先前状态对象 [英] previous state object of onFlushDirty()

问题描述

如何在EmptyInterceptor的onFlushDirty()方法中获取实体的先前状态对象?我可以拥有当前会话和当前实体对象，但是不会获得该实体对象的先前状态.请帮助

How to get the previous state object of an entity in onFlushDirty() method of EmptyInterceptor? I can have the current session and current entity object but getting the previous state for that entity object is not coming up. Please help

推荐答案

您可以使用Object[] previousState and String[] propertyNames参数访问先前的对象值.

You can access previous object values using Object[] previousState and String[] propertyNames parameters.

@Override
public boolean onFlushDirty(Object entity, Serializable id, Object[] currentState,
                    Object[] previousState, String[] propertyNames, Type[] types) {

  //Assume SampleBO is your BO class
   if (entity instanceof SampleBO){

    String userName=  previousState[ArrayUtils.indexOf(propertyNames, "userName")].toString();

    //Do what ever you want with values

   ((SampleBO)entity).setUserName(userName);

}
}

我已将其用于我的BO审计目的，在那里我只是以Json obj的形式获取previousState和currentState之间的对象差异.

I have used this for my BO audit purposes in there i just fetch the object difference between previousState and currentState as a Json obj.

ObjectDiffVo类

class ObjectDiffVo{

   propertyName;
   oldValue;
   newValue;

//getter and setters
}

CompareObjDiff函数

private List<ObjectDiffVo> compareObjDiff(Object[] currentState,
            Object[] previousState, String[] propertyNames) {

        List<ObjectDiffVo> odVoL = new ArrayList<>();

        for (int i = 0; i < propertyNames.length; i++) {

            if (previousState[i] != currentState[i]) {

                ObjectDiffVo odVo = new ObjectDiffVo();
                odVo.setPropertyName(propertyNames[i]);
                odVo.setOldValue(previousState[i]);
                odVo.setNewValue(currentState[i]);
                odVoL.add(odVo);
            }

        }

        return odVoL;
    }

希望这会对您有所帮助.

Hope this will help you.

这篇关于onFlushDirty()的先前状态对象的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！