Question

嗨我得到了这个例子：

NHibernate.PropertyAccessException未被用户代码
处理   HResult = -2146232832消息=异常发生的getter   SpellenDatabase.Domain.Model.Location.Id Source = NHibernate
  堆栈跟踪：          bij NHibernate.Properties.BasicPropertyAccessor.BasicGetter.Get（Object   目标）          bij NHibernate.Tuple.Entity.AbstractEntityTuplizer.GetIdentifier（Object   实体）          bij NHibernate.Persister.Entity.AbstractEntityPersister.GetIdentifier（Object   obj，EntityMode entityMode）          bij NHibernate.Persister.Entity.AbstractEntityPersister.IsTransient（Object   实体，ISessionImplementor会话）          bij NHibernate.Engine.ForeignKeys.IsTransient（String entityName，Object entity，Nullable 1 assumed, ISessionImplementor session) bij NHibernate.Event.Default.AbstractSaveEventListener.GetEntityState(Object entity, String entityName, EntityEntry entry, ISessionImplementor source) bij NHibernate.Event.Default.DefaultSaveOrUpdateEventListener.PerformSaveOrUpdate(SaveOrUpdateEvent event) bij NHibernate.Event.Default.DefaultSaveOrUpdateEventListener.OnSaveOrUpdate(SaveOrUpdateEvent event) bij NHibernate.Impl.SessionImpl.FireSaveOrUpdate(SaveOrUpdateEvent event) bij NHibernate.Impl.SessionImpl.SaveOrUpdate(String entityName, Object obj) bij NHibernate.Engine.CascadingAction.SaveUpdateCascadingAction.Cascade(IEventSource session, Object child, String entityName, Object anything, Boolean isCascadeDeleteEnabled) bij NHibernate.Engine.Cascade.CascadeToOne(Object parent, Object child, IType type, CascadeStyle style, Object anything, Boolean isCascadeDeleteEnabled) bij NHibernate.Engine.Cascade.CascadeAssociation(Object parent, Object child, IType type, CascadeStyle style, Object anything, Boolean isCascadeDeleteEnabled) bij NHibernate.Engine.Cascade.CascadeProperty(Object parent, Object child, IType type, CascadeStyle style, Object anything, Boolean isCascadeDeleteEnabled) bij NHibernate.Engine.Cascade.CascadeOn(IEntityPersister persister, Object parent, Object anything) bij NHibernate.Event.Default.AbstractSaveEventListener.CascadeAfterSave(IEventSource source, IEntityPersister persister, Object entity, Object anything) bij NHibernate.Event.Default.AbstractSaveEventListener.PerformSaveOrReplicate(Object entity, EntityKey key, IEntityPersister persister, Boolean useIdentityColumn, Object anything, IEventSource source, Boolean requiresImmediateIdAccess) bij NHibernate.Event.Default.AbstractSaveEventListener.PerformSave(Object entity, Object id, IEntityPersister persister, Boolean useIdentityColumn, Object anything, IEventSource source, Boolean requiresImmediateIdAccess) bij NHibernate.Event.Default.AbstractSaveEventListener.SaveWithGeneratedId(Object entity, String entityName, Object anything, IEventSource source, Boolean requiresImmediateIdAccess) bij NHibernate.Event.Default.DefaultSaveOrUpdateEventListener.SaveWithGeneratedOrRequestedId(SaveOrUpdateEvent event) bij NHibernate.Event.Default.DefaultSaveOrUpdateEventListener.EntityIsTransient(SaveOrUpdateEvent event) bij NHibernate.Event.Default.DefaultSaveOrUpdateEventListener.PerformSaveOrUpdate(SaveOrUpdateEvent event) bij NHibernate.Event.Default.DefaultSaveOrUpdateEventListener.OnSaveOrUpdate(SaveOrUpdateEvent event) bij NHibernate.Impl.SessionImpl.FireSaveOrUpdate(SaveOrUpdateEvent event) bij NHibernate.Impl.SessionImpl.SaveOrUpdate(Object obj) bij SpellenDatabase.DataLayer.BaseRepository 1.SaveOrUpdate（T item）in   C：\用户\ Gebruiker \文件\ Programmeren \ SpellenDatabase \ SpellenDatabase.DataLayer \ BaseRepository.cs：葱   27          bij SpellenDatabase.Web.Controllers.ActiviteitController.Create（Activiteit   活动）   C：\用户\ Gebruiker \文档\ Programmeren \ SpellenDatabase \ SpellenDatabase.Web \ \控制器ActiviteitController.cs：葱   81          bij lambda_method（Closure，ControllerBase，Object []）          bij System.Web.Mvc.ActionMethodDispatcher.Execute（ControllerBase   controller，Object []参数）          bij System.Web.Mvc.ReflectedActionDescriptor.Execute（ControllerContext   controllerContext，IDictionary 2 parameters) bij System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary 2   参数）          bij System.Web.Mvc.ControllerActionInvoker。＆lt;＆gt; c__DisplayClass15.b__12（）          bij System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter（IActionFilter）   filter，ActionExecutingContext preContext，Func`1 continuation）
  InnerException：System.Reflection.TargetException          的HResult = -2146232829          消息= Het对象komt niet overeen遇到了het doeltype。          来源= mscorlib程序          堆栈跟踪：               bij System.Reflection.RuntimeMethodInfo.CheckConsistency（Object target）               bij System.Reflection.RuntimeMethodInfo.InvokeArgumentsCheck（Object obj，   BindingFlags invokeAttr，Binder binder，Object []参数，   文化信息文化）               bij System.Reflection.RuntimeMethodInfo.Invoke（Object obj，BindingFlags invokeAttr，Binder binder，Object []参数，   文化信息文化）               bij System.Reflection.RuntimePropertyInfo.GetValue（Object obj，BindingFlags invokeAttr，Binder binder，Object [] index，   文化信息文化）               bij System.Reflection.RuntimePropertyInfo.GetValue（Object obj，Object [] index）               bij NHibernate.Properties.BasicPropertyAccessor.BasicGetter.Get（Object   目标）          的InnerException：

在使用Locationusage插入activiteit并引用现有位置时出现异常。当我插入一个新的位置时，我也没有例外。

我希望some1可以帮助我，我找不到任何有用的东西

我的班级：

public class Location
{
    public virtual int Id { get; set; }
    public virtual string Name { get; set; }
    public virtual IEnumerable<LocationUsage> Usage { get; set; }
}

public class LocationUsage
{
    public virtual int Id { get; set; }
    public virtual Location Location { get; set; }
    public virtual Activiteit Activiteit { get; set; }
    public virtual string Discription { get; set; }
}

public class Activiteit
{
    public virtual int Id { get; set; }
    public virtual string Name { get; set; }
    public virtual string Discription { get; set; }
    public virtual ICollection<Variatie> Variaties { get; set; }
    public virtual int MinAge { get; set; }
    public virtual int MaxAge { get; set; }
    public virtual ActiviteitSoort ActiviteitSoort { get; set; }
    public virtual LocationUsage Location { get; set; }
    public virtual ICollection<MateriaalUseage> Materials { get; set; }
}

我的映射文件：

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="SpellenDatabase.Domain.Model" assembly="SpellenDatabase.Domain">

  <class name="Location" table="Location">
    <id name="Id" type="Int32">
      <column name="Id" sql-type="int" />
      <generator class="increment" />
    </id>
    <property name="Name">
      <column name="Name" not-null="true" />
    </property>
    <set name="Usage" inverse="true">
      <key column="Id" />
      <one-to-many class="LocationUsage" />
    </set>
  </class>
</hibernate-mapping>

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="SpellenDatabase.Domain.Model" assembly="SpellenDatabase.Domain">

  <class name="LocationUsage" table="LocationUsage">
    <id name="Id" type="Int32">
      <column name="Id" sql-type="int" />
      <generator class="increment" />
    </id>
    <many-to-one name="Location" class="Location" column="Location" cascade="none" />
    <many-to-one name="Activiteit" class="Activiteit" column="Activiteit" unique="true" />
    <property name="Discription" />
  </class>
</hibernate-mapping>

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="SpellenDatabase.Domain.Model" assembly="SpellenDatabase.Domain">

  <class name="Activiteit" table="Activiteit">

    <id name="Id">
      <column name="Id" sql-type="int" not-null="true" />
      <generator class="increment" />
    </id>

    <property name="Name">
      <column name="Name" not-null="true" />
    </property>
    <property name="Discription">
      <column name="Discription" not-null="true" />
    </property>
    <property name="MinAge" />
    <property name="MaxAge" />

    <one-to-one name="Location" class="Location" cascade="save-update" />
    <many-to-one name="ActiviteitSoort" class="ActiviteitSoort" column="ActiviteitSoort" />

    <set name="Variaties" cascade="save-update">
      <key column="Id" />
      <one-to-many class="Variatie" />
    </set>

    <set name="Materials" cascade="save-update">
      <key column="Id" />
      <one-to-many class="MateriaalUseage" />
    </set>

  </class>

</hibernate-mapping>

表：

create table Activiteit(
Id int,
Name varchar(50),
Discription varchar(max),
MinAge int,
MaxAge int,
ActiviteitSoort int,
PRIMARY KEY (Id),
FOREIGN KEY (ActiviteitSoort) REFERENCES ActiviteitSoort(Id))

create table Location (
Id int,
Name varchar(50),
PRIMARY KEY (Id))

create table LocationUsage(
Id int,
Location int,
Activiteit int,
Discription varchar(max),
PRIMARY KEY (Id),
FOREIGN KEY (Activiteit) REFERENCES Activiteit(Id),
FOREIGN KEY (Location) REFERENCES Location(Id))

C＃：

ISession session = NHibernateHelper.GetCurrentSession(); 
ITransaction tx = session.BeginTransaction();
try
{
    session.SaveOrUpdate(item);
    session.Flush();
    tx.Commit();
}
catch (Exception e)
{
    tx.Rollback();
    throw;
}
finally
{
    NHibernateHelper.CloseSession();
}

Answer 1

你做了一对一的错误。

  <class name="Location" table="Location">
    <id name="Id" type="Int32">
      <column name="Id" sql-type="int" />
      <generator class="increment" />
    </id>

该位置被映射为Activiteit一对一。这意味着，它共享相同的主键。所以他们不能都有自己的发电机。

看看this great post by Ayende。

说实话，我不会一对一使用。这太乱了。使用常规的多对一（将另一个外键添加到Activiteit表中）。

Nhibernate：异常发生了id

1 个答案: