Question

我的一个POCO中有Status属性作为鉴别器（非常类似于使用enum）。

以下是具有Status列的HBM的一部分。

<many-to-one class="Locate.Common.Domain.Statuses.Status, Locate.Common, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" name="Status">
  <column name="Status_id" not-null="true" />
</many-to-one>

这是Status表的HBM。

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
  <class xmlns="urn:nhibernate-mapping-2.2" name="Locate.Common.Domain.Statuses.Status, Locate.Common, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" table="`Status`">
    <id access="nosetter.lowercase-underscore" name="Id" type="System.Int32, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
      <column name="Status_id" />
      <generator class="assigned" />
    </id>
    <discriminator type="String">
      <column name="Status_id" />
    </discriminator>
    <property access="nosetter.lowercase-underscore" name="Name" type="System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
      <column name="Name" not-null="true" />
    </property>
    <property access="nosetter.camelcase-underscore" name="IsUserSelectable" type="System.Boolean, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
      <column name="IsUserSelectable" not-null="true" />
    </property>
    <subclass name="Locate.Common.Domain.Statuses.CallbackStatus, Locate.Common, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" discriminator-value="3" />
    <subclass name="Locate.Common.Domain.Statuses.EmergencyStatus, Locate.Common, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" discriminator-value="5" />
    <subclass name="Locate.Common.Domain.Statuses.FirstCheckerStatus, Locate.Common, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" discriminator-value="1" />
    <subclass name="Locate.Common.Domain.Statuses.PleaseAdviseStatus, Locate.Common, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" discriminator-value="4" />
    <subclass name="Locate.Common.Domain.Statuses.SecondCheckerStatus, Locate.Common, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" discriminator-value="2" />
  </class>
</hibernate-mapping>

最后，这是我的QueryOver。

var locates =
    session.QueryOver(() => locateAlias)
    .SelectList(x => x
        .Select(xx => xx.WorkToBeginDateTime).WithAlias(() => sentTo.DueDate)
        .Select(xx => xx.SendTo).WithAlias(() => sentTo.SentTo)
        .Select(xx => xx.TicketNo).WithAlias(() => sentTo.TicketNo)
        .Select(xx => xx.Status).WithAlias(() => sentTo.Status)
    )
    .JoinAlias(() => locateAlias.Status, () => statusAlias)
    .Where(() => locateAlias.IsComplete == false)
    .TransformUsing(Transformers.AliasToBean<SentToDto>()).List<SentToDto>();

此查询运行时没有错误，但Status属性未正确初始化。当我使用Status值时，我收到此异常。

Initializing[Locate.Common.Domain.Statuses.Status#2]-Could not initialize proxy - no Session.

查看NHibernate Profiler我可以看到它实际上选择了正确的Status_id。

HBM或查询有什么问题？

请注意，我已成功查询所有状态并接收所有状态鉴别器对象的列表。我还可以看到生成的代理对象包含Status对象的正确值，因此NHibernate正确返回正确的值。

Answer 1

您的查询并不是Eeger-fetch Status属性，稍后当您访问Status时，您已加载该位置的会话已经关闭。因此，而不是.JoinAlias(() => locateAlias.Status, () => statusAlias)使用.Fetch(locate => locate.Status).Eager

编辑：我验证了它，因为选择状态不是急切获取的。如果返回locate-object，它只会急切地获取。你可以这样做：

var locates =
    session.QueryOver(() => locateAlias)
    .Where(() => locateAlias.IsComplete == false)
    .Fetch(locate => locate.Status).Eager
    .ToEnumerable()
    .Select(locate => new SentToDto
    {
        DueDate = locate.WorkToBeginDateTime,
        SendTo = locate.SendTo,
        TicketNo = locate.TicketNo,
        Status = locate.Status,
    }.ToList();

为什么我的鉴别器被作为代理返回？

1 个答案: