IPreUpdateEventListener和dynamic-update ＝"true". [英] IPreUpdateEventListener and dynamic-update="true"

问题描述

在

I have been trying to do a very simple auditing scenario following Ayende's blog which seem to be the resource everyone is refering to when it comes to IPreUpdateEventListener and IPreInsertEventListener.

但是，无论我多么努力，我都无法使它正常工作.该事件正确触发，当我逐步执行该事件时一切正常，但是从未将任何"changedtime"更新发布到数据库.

However no matter how hard I tried, I couldn't get it to work. The event fired correctly, everything looked ok when I stepped through it but no update of my "changedtime" was ever issued to the database.

我花了整整一天的时间进行了搜索，最后找到了答案此处.

I spent about a day googling this and finally found the answer here.

当您的实体使用dynamic-update ="true"映射时，它将不起作用.可以肯定的是，我就是这种情况.由于我很难找到这条信息，因此使用dynamic-update ="true"并不罕见吗?我们在所有实体上使用它.

It just won't work when you have your entity mapped with dynamic-update="true". And sure enough, that was the case for me. Since it was so hard for me to find this piece of information, is it uncommon to use dynamic-update="true"? We use it on all our entities.

因为这对我们来说是一个重大障碍，所以我想问一下是否有解决办法?

As this is a major bump in the road for us I wanted to ask if there's any way around this at all?

我一直在研究IInterceptor，但是它总是被认为是过时的，所以这有什么缺点呢?同样，我也找不到关于如何使用IInterceptor(对NHibernate相当陌生)归档相同审计(带有插入/更新时间戳)的非常好的教程.

I have been looking at IInterceptor but it's always refered to as outdated, so what's the drawbacks with this? Also I haven't been able to find a really good tutorial on how to archieve the same auditing (with insert/update timestamps) with IInterceptor (I'm fairly new to NHibernate).

任何帮助将不胜感激！

推荐答案

我遇到了这个确切的问题.这是我解决的方法:

I ran into this exact issue. This is how I fixed it:

public class MyFlushEntityEventListener : DefaultFlushEntityEventListener
{
    protected override void DirtyCheck(FlushEntityEvent e)
    {
        base.DirtyCheck(e);
        if (e.DirtyProperties != null &&
            e.DirtyProperties.Any() &&
            //ITrackUpdate is my inteface for audited entities
            e.Entity is ITrackUpdate)
            e.DirtyProperties = e.DirtyProperties
             .Concat(GetAdditionalDirtyProperties(e)).ToArray();
    }

    static IEnumerable<int> GetAdditionalDirtyProperties(FlushEntityEvent @event)
    {
        yield return Array.IndexOf(@event.EntityEntry.Persister.PropertyNames, 
                                   "UpdateTime");
        yield return Array.IndexOf(@event.EntityEntry.Persister.PropertyNames, 
                                   "UpdateUser");
        //You can add any additional properties here.
        //Some of my entities do not track the user, for example.
    }
}

然后，只需替换NH配置文件中的事件侦听器:

Then, just replace the event listener in the NH config file:

<listener type="flush-entity"
          class="MyFlushEntityEventListener, MyAssembly"/>

这篇关于IPreUpdateEventListener和dynamic-update ＝"true".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！