使用 VB.NET/MBUnit 实现 NHibernate 单元测试以生成模式

Question

我正在尝试为我的 NHibernate 数据访问层实施单元测试。我从网上找到的一个示例 (http://blogs.hibernatingrhinos.com/nhibernate/archive/2008/04/01/your-first-nhibernate-based-application.aspx) 中提取的第一个测试只是尝试使用我的域类/映射重新创建数据库。我已经能够让这个示例在 C# 中工作（产品表是在数据库中创建的），但是当我在 VB.NET 中实现它时却没有。

我有两个项目，Todd.Core（包含 Product 类和 Product.hbm.xml 映射）和 Todd.Core.Test（包含 Test Fixture 和 NHibernate 配置）。当我尝试使用 MBUnit GUI 运行此测试时，我收到此消息（第 10 行是对 .Configure 方法的调用）：

Message: Could not compile the mapping document: Todd.Core.Product.hbm.xml

Type: NHibernate.MappingException
Source: NHibernate
TargetSite: Void LogAndThrow(System.Exception)
HelpLink: null
Stack:   at NHibernate.Cfg.Configuration.LogAndThrow(Exception exception)
   at NHibernate.Cfg.Configuration.AddValidatedDocument(NamedXmlDocument doc)
   at NHibernate.Cfg.Configuration.ProcessMappingsQueue()
   at NHibernate.Cfg.Configuration.AddDocumentThroughQueue(NamedXmlDocument document)
   at NHibernate.Cfg.Configuration.AddXmlReader(XmlReader hbmReader, String name)
   at NHibernate.Cfg.Configuration.AddInputStream(Stream xmlInputStream, String name)
   at NHibernate.Cfg.Configuration.AddResource(String path, Assembly assembly)
   at NHibernate.Cfg.Configuration.AddAssembly(Assembly assembly)
   at NHibernate.Cfg.Configuration.AddAssembly(String assemblyName)
   at NHibernate.Cfg.Configuration.DoConfigure(IHibernateConfiguration hc)
   at NHibernate.Cfg.Configuration.Configure()
   at Todd.Core.Test.GenerateSchema_Fixture.Can_generate_schema() in C:\Development\Todd\Todd.Core.Test\GenerateSchema_Fixture.vb:line 10

任何想法表示赞赏。下面是我的代码……

我的产品类别：

Namespace Todd.Core

    Public Class Product
        Private _id As Guid
        Private _name As String
        Private _category As String
        Private _discontinued As Boolean

        Public Overridable Property Id() As Guid
            Get
                Return _id
            End Get
            Set(ByVal value As Guid)
                _id = value
            End Set
        End Property
        Public Overridable Property Name() As String
            Get
                Return _name
            End Get
            Set(ByVal value As String)
                _name = value
            End Set
        End Property
        Public Overridable Property Category() As String
            Get
                Return _category
            End Get
            Set(ByVal value As String)
                _category = value
            End Set
        End Property
        Public Overridable Property Discontinued() As Boolean
            Get
                Return _discontinued
            End Get
            Set(ByVal value As Boolean)
                _discontinued = value
            End Set
        End Property
    End Class
End Namespace

我的 Product.hbm.xml 文件：

<?xml version="1.0" encoding="utf-8" ?>
  <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
  <class name="Todd.Core.Product, Todd.Core" table="Product">
    <id name="Id">
      <generator class="guid" />
    </id>
    <property name="Name" />
    <property name="Category" />
    <property name="Discontinued" />
  </class>
</hibernate-mapping>

我的测试夹具：

Imports MbUnit.Framework
Imports Todd.Core

<TestFixture()> _
Public Class GenerateSchema_Fixture

    <Test()> _
    Public Sub Can_generate_schema()
        Dim cfg As New NHibernate.Cfg.Configuration
        cfg.Configure()
        cfg.AddAssembly(GetType(Todd.Core.Product).Assembly)
        Dim exp As NHibernate.Tool.hbm2ddl.SchemaExport = New NHibernate.Tool.hbm2ddl.SchemaExport(cfg)
        exp.Execute(True, True, False, True)
    End Sub

End Class

我的 app.config（来自测试项目）：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="hibernate-configuration"
      type="NHibernate.Cfg.ConfigurationSectionHandler, NHibernate" />
  </configSections>
  <hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
    <session-factory>
      <property name="connection.provider">NHibernate.Connection.DriverConnectionProvider, NHibernate</property>
      <property name="connection.connection_string">data source=.\SQLEXPRESS;Initial Catalog=NHibernateTestDB;Integrated Security=SSPI</property>
      <property name="dialect">NHibernate.Dialect.MsSql2005Dialect</property>
      <property name="show_sql">true</property>
      <mapping assembly="Todd.Core" />
    </session-factory>
  </hibernate-configuration>
</configuration>

Answer 1

该部分声明包含类声明和映射文件的程序集的名称。映射文件包含用于将 POCO 类映射到数据库表（或多个表）的元数据。

另一方面，你有

cfg.AddAssembly(GetType(Todd.Core.Product).Assembly)

在您的“GenerateSchema_Fixture”中。这意味着 NHibernate 将加载包含在程序集中的所有映射文件。

您必须决定要为 NHibernate 提供信息的方式。

如果您想以编程方式完成所有操作，我建议您使用 FluentNHibernate。您可以通过流畅的界面声明所有内容，而不必考虑 XML 文件。 (fluentnhibernate.org)。