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

问题描述

我一直在尝试按照 Ayende 的博客，这似乎是每个人在谈到 IPreUpdateEventListener 和 IPreInsertEventListener 时都会参考的资源.

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.

然而，无论我多么努力，我都无法让它发挥作用.事件正确触发，当我通过它时一切看起来都很好，但是我的changedtime"没有更新到数据库.

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.

我在谷歌上搜索了大约一天，终于找到了答案这里.

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

当您将实体映射为 dynamic-update="true" 时，它就无法工作.果然，我就是这种情况.既然这么难找这个资料，用dynamic-update="true"是不是不常见?我们在所有实体上都使用它.

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的障碍，所以我想问一下有没有办法解决这个问题?

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，但它总是被称为过时的，那么它的缺点是什么?此外，我还没有找到关于如何使用 IInterceptor 归档相同审计(带有插入/更新时间戳)的非常好的教程(我对 NHibernate 还很陌生).

I have been looking at IInterceptor but it's always refered to as outdated, so what's the drawbacks with this?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.这是我修复它的方式:

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！