Question

使用nHibernate 3.2，C＃4.0，SQL Server 2008 R2 Express

我有两个业务实体 - Broker和Market。它们分别存储在brokers和markets表中。我还有一个名为brokerMarkets的{{1}}表。 Broker和Market之间有很多关系，但只有当我想存储MinIncrement 值时（即它是可选的）。我的课程看起来像这样：

MinIncrement

我的映射文件如下所示： Market.hbm.xml

public class Market : BusinessBase
{
    public Market() {}

    public virtual int Id { get; set; }
    public virtual string Symbol { get; set; }
    public virtual string Description { get; set; }
}

public class Broker : BusinessBase
{
    public virtual int Id { get; set; }
    public virtual string Name { get; set; }
    public virtual bool IsDefault { get; set; }
    public virtual bool IsActive { get; set; }
    public virtual ISet<Account> Accounts { get; set; }
}

public class BrokerMarket : Market
{
    public BrokerMarket() { }

    public virtual Broker Broker {get; set;}
    public virtual decimal MinIncrement { get; set; }
}

Broker.hbm.xml

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                   assembly="MooDB"
                   namespace="MooDB.BusinessLayer">

    <class name="MooDB.BusinessLayer.Market,MooDB" table="markets">
        <id name="Id" column="marketId" type="Int32" unsaved-value="0">
            <generator class="native" />
        </id>           
        <version name="Version" column="version" type="integer" unsaved-value="0" />
        <property name="Symbol" column="symbol" type="String" length="10" not-null="true" />
        <property name="Description" column="description" type="String" length="30" not-null="true" />

        <set name="Brokers" generic="true" table="brokerMarkets">
            <key column="marketId" />
            <many-to-many column="brokerId" class="MooDB.BusinessLayer.Broker,MooDB" />            
        </set>
    </class>
</hibernate-mapping>

在我的数据访问层中，我有一个添加BrokerMarket的方法：

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                   assembly="MooDB"
                   namespace="MooDB.BusinessLayer">

    <class name="MooDB.BusinessLayer.Broker,MooDB" table="brokers">
        <id name="Id" column="brokerId" type="Int32" unsaved-value="0">
            <generator class="native" />
        </id>
        <version name="Version" column="version" type="integer" unsaved-value="0" />
        <property name="Name" column="broker" type="String" length="50" not-null="true" />
        <property name="IsActive" column="isActive" type="bool" not-null="true" />
        <property name="IsDefault" column="isDefault" type="bool" not-null="true" />

        <set name="Markets" generic="true" table="brokerMarkets">
            <key column="brokerId" />
            <many-to-many column="marketId" class="MooDB.BusinessLayer.Market,MooDB" />
        </set>

        <set name="Accounts" table="accounts" generic="true" inverse="true">
            <key column="brokerId" />
            <one-to-many class="MooDB.BusinessLayer.Account,MooDB" />
        </set>
    </class>    
</hibernate-mapping>

在我的单元测试中，我尝试添加像这样的BrokerMarket：

public void AddBrokerMarket(BrokerMarket bm)
{
    using (ITransaction tx = _session.BeginTransaction())
    {
        try
        {
            _session.Save(bm);
            _session.Flush();
            tx.Commit();
        }
        catch (HibernateException)
        {
            tx.Rollback();
            throw;
        }
    }
}

当我运行测试时，我收到此错误：

运行测试。测试 'MooDBTests / MooDB / Tests / DataLayerTests / CanAddBrokerMarket'失败：消息NHibernate.MappingException：没有持久性： MooDB.BusinessLayer.BrokerMarket Stack Trace at NHibernate.Impl.SessionFactoryImpl.GetEntityPersister（字符串 entityName）at NHibernate.Impl.SessionImpl.GetEntityPersister（String entityName，Object obj）at NHibernate.Event.Default.AbstractSaveEventListener.SaveWithGeneratedId（对象 entity，String entityName，Object any，IEventSource source，布尔值requireImmediateIdAccess）at NHibernate.Event.Default.DefaultSaveOrUpdateEventListener.SaveWithGeneratedOrRequestedId（SaveOrUpdateEvent 事件） NHibernate.Event.Default.DefaultSaveEventListener.SaveWithGeneratedOrRequestedId（SaveOrUpdateEvent 事件） NHibernate.Event.Default.DefaultSaveOrUpdateEventListener.EntityIsTransient（SaveOrUpdateEvent 事件） NHibernate.Event.Default.DefaultSaveEventListener.PerformSaveOrUpdate（SaveOrUpdateEvent 事件） NHibernate.Event.Default.DefaultSaveOrUpdateEventListener.OnSaveOrUpdate（SaveOrUpdateEvent 事件）在NHibernate.Impl.SessionImpl.FireSave（SaveOrUpdateEvent 事件）在NHibernate.Impl.SessionImpl.Save（Object obj） NHibernateDataProvider.cs（91,0）：at MooDB.DataLayer.NHibernateDataProvider.AddBrokerMarket（BrokerMarket bm）DataLayerTests.cs（81,0）：at MooDB.Tests.DataLayerTests.CanAddBrokerMarket（）

我不确定我做错了什么。我是否需要在[Test] public void CanAddBrokerMarket() { Broker broker = _provider.GetBrokerById(1); Market market = _provider.GetMarketById(2); var brokerMarket = new BrokerMarket { Broker = broker, Description = market.Description, Symbol = market.Symbol, MinIncrement = 0.01M }; _provider.AddBrokerMarket(brokerMarket); }课程中添加Broker集合，在Market课程中添加Market集合？我确实尝试了但是我得到了同样的错误，我认为我在某处概念性地遗漏了某些东西。

更新

我已实施以下更改： Market.hbm.xml

Broker

Broker.hbm.xml

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                   assembly="MooDB"
                   namespace="MooDB.BusinessLayer">

    <class name="MooDB.BusinessLayer.Market,MooDB" table="markets">
        <id name="Id" column="marketId" type="Int32" unsaved-value="0">
            <generator class="native" />
        </id>           
        <version name="Version" column="version" type="integer" unsaved-value="0" />
        <property name="Symbol" column="symbol" type="String" length="10" not-null="true" />
        <property name="Description" column="description" type="String" length="30" not-null="true" />
      <map name="BrokerMarkets" table="brokerMarkets" lazy="true" cascade="none">
        <cache usage="read-write"/>
        <key column="marketId" />
        <index column="brokerId" type="Int32" />
        <composite-element class="MooDB.BusinessLayer.BrokerMarket,MooDB">
          <parent name="Market"/>
          <property name="MinIncrement" column="minIncrement" type="decimal" />
          <many-to-one name="Broker" class="MooDB.BusinessLayer.Broker,MooDB" column="brokerId" />
        </composite-element>        
      </map>
    </class>
</hibernate-mapping>

<?xml version="1.0" encoding="utf-8" ?> <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="MooDB" namespace="MooDB.BusinessLayer"> <class name="MooDB.BusinessLayer.Broker,MooDB" table="brokers"> <id name="Id" column="brokerId" type="Int32" unsaved-value="0"> <generator class="native" /> </id> <version name="Version" column="version" type="integer" unsaved-value="0" /> <property name="Name" column="broker" type="String" length="50" not-null="true" /> <property name="IsActive" column="isActive" type="bool" not-null="true" /> <property name="IsDefault" column="isDefault" type="bool" not-null="true" /> <set name="Accounts" table="accounts" generic="true" inverse="true"> <key column="brokerId" /> <one-to-many class="MooDB.BusinessLayer.Account,MooDB" /> </set> </class> </hibernate-mapping>上课：

Market

public class Market : BusinessBase { public Market() {} public virtual int Id { get; set; } public virtual string Symbol { get; set; } public virtual string Description { get; set; } public virtual ISet<BrokerMarket> BrokerMarkets { get; set; } //added this line }上课

BrokerMarket

其他一切都没有改变。我再次运行单元测试，然后得到：

运行测试。测试   'MooDBTests / MooDB / Tests / DataLayerTests / CanAddBrokerMarket'失败：     消息TestFixtureSetUp在DataLayerTests中失败

测试'MooDBTests / MooDB / Tests / DataLayerTests'失败：消息设置：   NHibernate.MappingException：映射中的重复列   集合：MooDB.BusinessLayer.Market.BrokerMarkets专栏：brokerId

更新2

如果我删除

public class BrokerMarket : Market { public BrokerMarket() { } public virtual Broker Broker {get; set;} public virtual Market Market { get; set; } // added this line public virtual decimal MinIncrement { get; set; } }

来自Market.hbm.xml的

运行单元测试时出现此错误：

运行测试。测试   'MooDBTests / MooDB / Tests / DataLayerTests / CanAddBrokerMarket'失败：     消息TestFixtureSetUp在DataLayerTests中失败

测试'MooDBTests / MooDB / Tests / DataLayerTests'失败：消息设置：   NHibernate.MappingException：MooDB.Mappings.Market.hbm.xml（17,10）：   XML验证错误：名称空间中的元素“map”   'urn：nhibernate-mapping-2.2'包含无效的子元素   命名空间'urn：nhibernate-mapping-2.2'中的'composite-element'。清单   可能的元素：'map-key，composite-map-key，   map-key-many-to-many，index，composite-index，index-many-to-many，   index-many-to-any'innamespace'瓮：nhibernate-mapping-2.2'。 ----＆GT;   System.Xml.Schema.XmlSchemaValidationException：元素'map'中   namespace'urn：nhibernate-mapping-2.2'具有无效的子元素   命名空间'urn：nhibernate-mapping-2.2'中的'composite-element'。清单   可能的元素：'map-key，composite-map-key，   map-key-many-to-many，index，composite-index，index-many-to-many，   index-many-to-any'in namespace'urn：nhibernate-mapping-2.2'。

Answer 1

错误可能是因为您还没有为BrokerMarket类定义映射，如果您希望像您一样保存代理市场，则必须创建BrokerMarket.hbm.xml。你也可以看一下像http://thesoftwaresimpleton.blogspot.com/2010/03/nhibernate-many-to-many-with-extra.html

那样使用复合元素

如何为许多映射配置nHibernate？

1 个答案: