NHibernate - not-null属性引用null或transient值

我收到此异常(底部的完全例外):

NHibernate.PropertyValueException was unhandled by user code
 Message="not-null property references a null or transient
valueClearwave.Models.Encounters.Insurance.Patient"
 Source="NHibernate"
 EntityName="Clearwave.Models.Encounters.Insurance"
 PropertyName="Patient"

我已经做了很多谷歌搜索,似乎这个错误最常见的原因是当一个关联是双向的但只有一半被设置.如:Insurance.Patient =患者被叫,但Patient.Insurances.Add(保险)不是.事实上,我确实有这样的场景,但我在调用Save之前检查了对象,并且Insurance.Patient和Patient.Insurances [0]都是正确的对象.

此异常似乎引用的另一种可能性是瞬态值.在我的情况下,每个对象都是暂时的,所以我怀疑问题的根源在这里.但是,现在一切都需要暂时,因为还没有保存.我希望NHibernate能够持久存在而不是抱怨它们不会被持久存在.

以下是我映射的一些片段(流利):

       public PatientMap()
       {
           WithTable("tPatient");

           Id(x => x.Id, "uid_Patient").GeneratedBy.GuidComb
().Access.AsReadOnlyPropertyThroughCamelCaseField();

           HasMany(x => x.Insurances).WithKeyColumn("uid_Patient")
               .Cascade.All()
               .Inverse();

          ...
       }

      public InsuranceMap()
       {
           WithTable("tPatientInsuranceInfo");

           Id(x => x.Id,
"uid_PatientInsuranceInfo").GeneratedBy.GuidComb
().Access.AsReadOnlyPropertyThroughCamelCaseField();

           References(x => x.Patient, "uid_Patient").Not.Nullable
().Cascade.All();

           ...
        }

那么,可能是什么问题呢？

NHibernate.PropertyValueException was unhandled by user code
 Message="not-null property references a null or transient
valueClearwave.Models.Encounters.Insurance.Patient"
 Source="NHibernate"
 EntityName="Clearwave.Models.Encounters.Insurance"
 PropertyName="Patient"
 StackTrace:
      at NHibernate.Engine.Nullability.CheckNullability(Object[]
values, IEntityPersister persister, Boolean isUpdate)
      at
NHibernate.Event.Default.AbstractSaveEventListener.PerformSaveOrReplicate
(Object entity, EntityKey key, IEntityPersister persister, Boolean
useIdentityColumn, Object anything, IEventSource source, Boolean
requiresImmediateIdAccess)
      at
NHibernate.Event.Default.AbstractSaveEventListener.PerformSave(Object
entity, Object id, IEntityPersister persister, Boolean
useIdentityColumn, Object anything, IEventSource source, Boolean
requiresImmediateIdAccess)
      at
NHibernate.Event.Default.AbstractSaveEventListener.SaveWithGeneratedId
(Object entity, String entityName, Object anything, IEventSource
source, Boolean requiresImmediateIdAccess)
      at
NHibernate.Event.Default.DefaultMergeEventListener.EntityIsTransient
(MergeEvent event, IDictionary copyCache)
      at NHibernate.Event.Default.DefaultMergeEventListener.OnMerge
(MergeEvent event, IDictionary copyCache)
      at NHibernate.Impl.SessionImpl.FireSaveOrUpdateCopy(IDictionary
copiedAlready, MergeEvent event)
      at NHibernate.Impl.SessionImpl.SaveOrUpdateCopy(String
entityName, Object obj, IDictionary copiedAlready)
      at
NHibernate.Engine.CascadingAction.SaveUpdateCopyCascadingAction.Cascade
(IEventSource session, Object child, String entityName, Object
anything, Boolean isCascadeDeleteEnabled)
      at NHibernate.Engine.Cascade.CascadeToOne(Object child, IType
type, CascadeStyle style, Object anything, Boolean
isCascadeDeleteEnabled)
      at NHibernate.Engine.Cascade.CascadeAssociation(Object child,
IType type, CascadeStyle style, Object anything, Boolean
isCascadeDeleteEnabled)
      at NHibernate.Engine.Cascade.CascadeProperty(Object child,
IType type, CascadeStyle style, Object anything, Boolean
isCascadeDeleteEnabled)
      at NHibernate.Engine.Cascade.CascadeOn(IEntityPersister
persister, Object parent, Object anything)
      at
NHibernate.Event.Default.AbstractSaveEventListener.CascadeBeforeSave
(IEventSource source, IEntityPersister persister, Object entity,
Object anything)
      at
NHibernate.Event.Default.DefaultMergeEventListener.EntityIsTransient
(MergeEvent event, IDictionary copyCache)
      at NHibernate.Event.Default.DefaultMergeEventListener.OnMerge
(MergeEvent event, IDictionary copyCache)
      at NHibernate.Impl.SessionImpl.FireSaveOrUpdateCopy(IDictionary
copiedAlready, MergeEvent event)
      at NHibernate.Impl.SessionImpl.SaveOrUpdateCopy(String
entityName, Object obj, IDictionary copiedAlready)
      at
NHibernate.Engine.CascadingAction.SaveUpdateCopyCascadingAction.Cascade
(IEventSource session, Object child, String entityName, Object
anything, Boolean isCascadeDeleteEnabled)
      at NHibernate.Engine.Cascade.CascadeToOne(Object child, IType
type, CascadeStyle style, Object anything, Boolean
isCascadeDeleteEnabled)
      at NHibernate.Engine.Cascade.CascadeAssociation(Object child,
IType type, CascadeStyle style, Object anything, Boolean
isCascadeDeleteEnabled)
      at NHibernate.Engine.Cascade.CascadeProperty(Object child,
IType type, CascadeStyle style, Object anything, Boolean
isCascadeDeleteEnabled)
      at NHibernate.Engine.Cascade.CascadeOn(IEntityPersister
persister, Object parent, Object anything)
      at
NHibernate.Event.Default.AbstractSaveEventListener.CascadeBeforeSave
(IEventSource source, IEntityPersister persister, Object entity,
Object anything)
      at
NHibernate.Event.Default.DefaultMergeEventListener.EntityIsTransient
(MergeEvent event, IDictionary copyCache)
      at NHibernate.Event.Default.DefaultMergeEventListener.OnMerge
(MergeEvent event, IDictionary copyCache)
      at NHibernate.Event.Default.DefaultMergeEventListener.OnMerge
(MergeEvent event)
      at NHibernate.Impl.SessionImpl.FireSaveOrUpdateCopy(MergeEvent
event)
      at NHibernate.Impl.SessionImpl.SaveOrUpdateCopy(Object obj)
      at Clearwave.Models.Data.Util.RepositoryBase`2.Save(EntityType&
entity) in C:\Projects\ClearWave\Src\Common\Domain Models
\Clearwave.Models.Data-NHibernate\Util\RepositoryBase.cs:line 25
      at IntegrationWebServices.FromMirth.SubmitMessage(Message
theMessage, Guid providerOrganizationId)
      at SyncInvokeSubmitMessage(Object , Object[] , Object[] )
      at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke
(Object instance, Object[] inputs, Object[]& outputs)
      at
System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin
(MessageRpc& rpc)
 InnerException:

Alun Harford.. 18

另一种可能性是您要保存整个对象图,并且该图是循环的,并且项不能为空.您可能会给NHibernate没有合法的订单来执行插入操作.(它应该产生更好的错误信息,但它产生了这个).

如果没有看到其他来源,很难获得更多帮助.尝试从映射中删除实体(而不是保存它们),直到找出导致问题的原因.

另一种可能性是您要保存整个对象图,并且该图是循环的,并且项不能为空.您可能会给NHibernate没有合法的订单来执行插入操作.(它应该产生更好的错误信息,但它产生了这个).

如果没有看到其他来源,很难获得更多帮助.尝试从映射中删除实体(而不是保存它们),直到找出导致问题的原因.

不确定它是否有帮助,但这对我来说.

cascade ="all"是我之前错过的

我最近遇到了这个问题,它与NHibernate双向关系的持久方式有关.您的映射是正确的,因此NHibernate将执行患者插入没有问题.然后NHibernate需要从患者那里获取密钥并将其级联到保险中.由于患者尚不存在,因此密钥不存在且无法执行第二次插入.关键是在持久化之前通过代码设置关系,如下所示:

patient = new Patient();
patient.Insurances.Add( new Insurance{ Patient = patient } );
repository.Save( patient);

现在我不得不在集合项上设置Patient属性,但是如果你忽略持久性,你将在代码中设置它,而不依赖于持久性策略.