为什么NHibernate说我的过滤器没有配置？

Question

我正在尝试在NHibernate中使用全局过滤器,据我所知,我正在完成所有教程所做的事情,但我得到了一个例外.

我的.hbm.xml文件包含以下内容:

...
<class name="NHibernateSandbox.Foo, NHibernateSandbox" table="Foo">
    ...
    <property column="Content" type="String" name="Content" not-null="true" length="100" />
    <property column="Deleted" type="Boolean" name="Deleted" not-null="true" />
    <filter name="Foo_Nondeleted" condition="Deleted = false" />
</class>

然后我有一个简单的测试类:

Configuration cfg = new Configuration();
cfg.Configure();

using (ISessionFactory sf = cfg.BuildSessionFactory()) {
    using (ISession session = sf.OpenSession()) {
        session.EnableFilter("Foo_Nondeleted");
        IQuery query = session.CreateQuery("FROM NHibernateSandbox.Foo");
        foreach (Foo foo in query.List<Foo>()) {
            Console.WriteLine(foo.Content);
        }
    }
}

如果我删除EnableFilter它按预期工作的行:打印已删除和未删除的行.但是,有了这EnableFilter行,我得到了一个N​​HibernateException

No such filter configured [Foo_Nondeleted]
  at NHibernate.Impl.SessionFactoryImpl.GetFilterDefinition(String filterName)
  at NHibernate.Impl.SessionImpl.EnableFilter(String filterName)
  at NHibernateSandbox.Program.Main(String[] args)

如果我将log4net配置为详细,那么我明白了

INFO  NHibernate.Cfg.HbmBinder - Mapping class: NHibernateSandbox.Foo -> Foo
DEBUG NHibernate.Cfg.HbmBinder - Mapped property: Id -> RID, type: Int32
DEBUG NHibernate.Cfg.HbmBinder - Mapped property: Content -> Content, type: String
DEBUG NHibernate.Cfg.HbmBinder - Mapped property: Deleted -> Deleted, type: Boolean
DEBUG NHibernate.Cfg.HbmBinder - Applying filter [Foo_Nondeleted] as [Deleted = false]

它"应用过滤器"和过滤器被"配置"并可用于会话之间缺少什么？

Answer 1

在类中添加过滤器是不够的:您还必须定义它.这归结为添加

<filter-def name="Foo_Nondeleted"></filter-def>

到.hbm.xml文件.请注意,这里有一个问题:虽然教程在课程之前显示它,但它必须放在XML之后,或者你会得到一个XmlSchemaValidationException.

还需要进行另一个小的更改:即使您可能已query.substitutions设置为映射false到0,但它不适用于过滤条件,因此您必须将过滤器更改为

<filter name="Foo_Nondeleted" condition="Deleted = 0" />