我想用NHibernate连接到Northwind数据库。但由于某种原因,我无法加载实体类型。NHibernate映射错误
这是我的实体类
public class Product
{
public virtual Int32 ProductId { get; set; }
public virtual String Desc { get; set; }
}
这里是我的映射
<class name="Product" table="Products">
<id name="ProductId" column="ProductId" type="Int32">
<generator class="identity"></generator>
</id>
<property name="Desc" column="ProductName" type="String" length="60">
</property>
</class>
我收到以下错误消息
无法加载实体:OracleLinq.Product#12 ] [SQL:SELECT product0_.ProductId as ProductId0_0_,product0_.ProductName as ProductN2_0_0_ FROM Products product0_ WHERE product0_.ProductId =?]
这里是堆栈跟踪
at NHibernate.Loader.Loader.LoadEntity(ISessionImplementor session, Object id, IType identifierType, Object optionalObject, String optionalEntityName, Object optionalIdentifier, IEntityPersister persister)
at NHibernate.Loader.Entity.AbstractEntityLoader.Load(ISessionImplementor session, Object id, Object optionalObject, Object optionalId)
at NHibernate.Loader.Entity.AbstractEntityLoader.Load(Object id, Object optionalObject, ISessionImplementor session)
at NHibernate.Persister.Entity.AbstractEntityPersister.Load(Object id, Object optionalObject, LockMode lockMode, ISessionImplementor session)
at NHibernate.Event.Default.DefaultLoadEventListener.LoadFromDatasource(LoadEvent event, IEntityPersister persister, EntityKey keyToLoad, LoadType options)
at NHibernate.Event.Default.DefaultLoadEventListener.DoLoad(LoadEvent event, IEntityPersister persister, EntityKey keyToLoad, LoadType options)
at NHibernate.Event.Default.DefaultLoadEventListener.Load(LoadEvent event, IEntityPersister persister, EntityKey keyToLoad, LoadType options)
at NHibernate.Event.Default.DefaultLoadEventListener.OnLoad(LoadEvent event, LoadType loadType)
at NHibernate.Impl.SessionImpl.FireLoad(LoadEvent event, LoadType loadType)
at NHibernate.Impl.SessionImpl.ImmediateLoad(String entityName, Object id)
at NHibernate.Proxy.AbstractLazyInitializer.Initialize()
at NHibernate.Proxy.AbstractLazyInitializer.GetImplementation()
at NHibernate.Proxy.Poco.Castle.CastleLazyInitializer.Intercept(IInvocation invocation)
at Castle.DynamicProxy.AbstractInvocation.Proceed()
at ProductProxy4c67cf5bf6e640ab82d8c21a90e2a62b.set_Desc(String value)
at OracleLinq.Form1.Form1_Load(Object sender, EventArgs e)
难道我做错了什么?
异常内部是否存在内部异常? – 2009-04-21 21:47:47
通常每当我得到这个nhibernate错误时,我都会尝试在Sql Management Studio中复制并粘贴SQL(使用替换的参数),以确保我没有做一些愚蠢的事情并拼错一列。 – Min 2009-04-23 21:55:45