如何在NHibernate实体中实现LastUpdate?

时间:2012-01-15 16:30:15

标签: c# nhibernate

我正在尝试为我的NHibernate实体实现一个自动LastUpdate属性。我想过使用数据库触发器,然后认为在NHibernate中做得更好。我正在关注此blog post作为指南。

我的域名实体是:

public class Instrument : Entity, IAuditableEntity
{
    public virtual string Name { get;  set; }
    public virtual string Symbol {get;  set;}
    public virtual ISet<BrokerInstrument> BrokerInstruments { get; set; }
    public virtual bool IsActive { get; set; }        
}

继承自

public abstract class Entity
{
    public virtual int Id { get; set; }
    public virtual int Version {get; private set;}
    public virtual DateTime CreateDate { get; private set; }
    public virtual DateTime UpdateDate { get; set; }
}

这是界面:

public interface IAuditableEntity
{
    DateTime UpdateDate { get; set; }
}

我的听众课程:

public class CustomUpdateEventListener : DefaultSaveEventListener
{
    protected override object PerformSaveOrUpdate(SaveOrUpdateEvent evt)
    {
        var entity = evt.Entity as IAuditableEntity;
        if (entity != null)
        {
            ProcessEntityBeforeUpdate(entity);
        }
        return base.PerformSaveOrUpdate(evt);
    }

    internal virtual void ProcessEntityBeforeUpdate(IAuditableEntity entity)
    {
        entity.UpdateDate = DateTime.Now;
    }
}

和我的域实体Instrument映射文件:

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="MooDB"  namespace="MooDB" >
  <class name="MooDB.Domain.Instrument,MooDB"  table="instruments">
    <id name="Id" column="instrumentId" unsaved-value="0">
      <generator class="increment"></generator>
    </id>
    <version name="Version" column="version" type="integer" unsaved-value="0"/>
    <property name="Symbol" column="symbol" type="string" length="10" not-null="false"/>
    <property name="Name" column="`name`" type="string" length="30" not-null="false"/>
    <property name="IsActive" column="isActive" type="bool" not-null="true" />
    <set name="BrokerInstruments" table="brokerInstruments" generic="true" inverse="true">
      <key column="instrumentId" />
      <one-to-many class="MooDB.Domain.BrokerInstrument"/>
    </set>
    <property name="CreateDate" column="created" not-null="false" />
    <property name="UpdateDate" column="lastUpdated" />
  </class>
</hibernate-mapping>

我的hibernate.cfg.xml:

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2" >
  <session-factory>
  ... connection details snipped
    <mapping assembly="MooDB"/>
    <listener class="MooDB.Data.CustomUpdateEventListener, MooDB.Data" type="update" />
  </session-factory>
</hibernate-configuration>

我的解决方案构建正常,但当NHibernate试图找到列表器时,我得到FileNotFoundException。我的引用设置正确,我有正确的using语句,所以我不确定为什么NHibernate找不到它。这是日志中的错误:

  

2012-01-15 15:26:12,911 [TestRunnerThread]错误   NHibernate.Util.ReflectHelper [(null)] - 无法加载类型   MooDB.Data.CustomUpdateEventListener,MooDB.Data。   System.IO.FileNotFoundException:无法加载文件或程序集   'MooDB.Data'或其依赖项之一。系统找不到了   文件指定。文件名:'MooDB.Data'

你知道可能出现什么问题吗?

修改:我现在收到以下SqlTypeException

2012-01-15 17:06:37,302 [TestRunnerThread]错误NHibernate.AdoNet.AbstractBatcher [(null)] - 无法执行命令:UPDATE instruments SET version = @ p0,symbol = @ p1,[name] = @ p2,isActive = @ p3,created = @ p4,lastUpdated = @ p5 WHERE instrumentId = @ p6 AND version = @ p7 System.Data.SqlTypes.SqlTypeException:SqlDateTime overflow。必须在1/1/1753 12:00:00 AM和12/31/9999 11:59:59 PM之间。

似乎entity.UpdateDate = DateTime.Now;中的代码ProcessEntityBeforeUpdate由于某种原因未运行。有什么想法吗?

1 个答案:

答案 0 :(得分:1)

看起来你的装配名称是错误的。试试这个:

<listener class="MooDB.Data.CustomUpdateEventListener, MooDB" type="update" />