用於存儲數據的數據庫的替代方法？

Question

我爲我的應用程序使用了SQL Server Compact Edition（本地數據庫）。但是，當我使用實體框架時，我經常遇到非常煩人的UpdateException。我的數據庫只有兩個帶有外鍵關係的小表連接在一起。所以我問是否有任何數據庫的替代方案？或者是唯一的選擇？
更新：
Here是EDMX地圖。
下面是異常的堆棧跟蹤：在System.Data.Mapping.Update.Internal.DynamicUpdateCommand.Execute System.Windows.Markup.XamlParseException was unhandled Message=Cannot create instance of 'MainWindow' defined in assembly 'AssignmentOrganizer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'. Exception has been thrown by the target of an invocation. Error in markup file 'AssignmentOrganizer;component/MainWindow.xaml' Line 1 Position 9. Source=PresentationFramework LineNumber=1 LinePosition=9 StackTrace: at System.Windows.Markup.XamlParseException.ThrowException(String message, Exception innerException, Int32 lineNumber, Int32 linePosition, Uri baseUri, XamlObjectIds currentXamlObjectIds, XamlObjectIds contextXamlObjectIds, Type objectType) at System.Windows.Markup.XamlParseException.ThrowException(ParserContext parserContext, Int32 lineNumber, Int32 linePosition, String message, Exception innerException) at System.Windows.Markup.BamlRecordReader.ThrowExceptionWithLine(String message, Exception innerException) at System.Windows.Markup.BamlRecordReader.CreateInstanceFromType(Type type, Int16 typeId, Boolean throwOnFail) at System.Windows.Markup.BamlRecordReader.GetElementAndFlags(BamlElementStartRecord bamlElementStartRecord, Object& element, ReaderFlags& flags, Type& delayCreatedType, Int16& delayCreatedTypeId) at System.Windows.Markup.BamlRecordReader.BaseReadElementStartRecord(BamlElementStartRecord bamlElementRecord) at System.Windows.Markup.BamlRecordReader.ReadElementStartRecord(BamlElementStartRecord bamlElementRecord) at System.Windows.Markup.BamlRecordReader.ReadRecord(BamlRecord bamlRecord) at System.Windows.Markup.BamlRecordReader.Read(Boolean singleRecord) at System.Windows.Markup.TreeBuilderBamlTranslator.ParseFragment() at System.Windows.Markup.TreeBuilder.Parse() at System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream) at System.Windows.Application.LoadBamlStreamWithSyncInfo(Stream stream, ParserContext pc) at System.Windows.Application.LoadComponent(Uri resourceLocator, Boolean bSkipJournaledProperties) at System.Windows.Application.DoStartup() at System.Windows.Application.<.ctor>b__0(Object unused) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter) at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler) at System.Windows.Threading.Dispatcher.WrappedInvoke(Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler) at System.Windows.Threading.DispatcherOperation.InvokeImpl() at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state) at System.Threading.ExecutionContext.runTryCode(Object userData) at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData) at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Windows.Threading.DispatcherOperation.Invoke() at System.Windows.Threading.Dispatcher.ProcessQueue() at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter) at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler) at System.Windows.Threading.Dispatcher.WrappedInvoke(Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler) at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Boolean isSingleParameter) at System.Windows.Threading.Dispatcher.Invoke(DispatcherPriority priority, Delegate method, Object arg) at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg) at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame) at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame) at System.Windows.Threading.Dispatcher.Run() at System.Windows.Application.RunDispatcher(Object ignore) at System.Windows.Application.RunInternal(Window window) at System.Windows.Application.Run(Window window) at System.Windows.Application.Run() at AssignmentOrganizer.App.Main() in C:\Users\Mohit\Documents\Visual Studio 2010\Projects\AssignmentOrganizer\AssignmentOrganizer\obj\x86\Debug\App.g.cs:line 0 at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args) at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart() InnerException: System.Reflection.TargetInvocationException Message=Exception has been thrown by the target of an invocation. Source=mscorlib StackTrace: at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandle& ctor, Boolean& bNeedSecurityCheck) at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean fillCache) at System.RuntimeType.CreateInstanceImpl(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean fillCache) at System.Activator.CreateInstance(Type type, Boolean nonPublic) at System.Windows.Markup.BamlRecordReader.CreateInstanceFromType(Type type, Int16 typeId, Boolean throwOnFail) InnerException: System.Data.UpdateException Message=An error occurred while updating the entries. See the InnerException for details. Source=System.Data.Entity StackTrace: at System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter) at System.Data.EntityClient.EntityAdapter.Update(IEntityStateManager entityCache) at System.Data.Objects.ObjectContext.SaveChanges(Boolean acceptChangesDuringSave) at System.Data.Objects.ObjectContext.SaveChanges() at AssignmentOrganizer.App_Data.AssignmentRepository.CreateAssignment(Assignment assignmentToCreate) in C:\Users\Mohit\Documents\Visual Studio 2010\Projects\AssignmentOrganizer\AssignmentOrganizer\App_Data\AssignmentRepository.cs:line 20 at AssignmentOrganizer.MainWindow..ctor() in C:\Users\Mohit\Documents\Visual Studio 2010\Projects\AssignmentOrganizer\AssignmentOrganizer\MainWindow.xaml.cs:line 34 InnerException: System.Data.EntityCommandCompilationException Message=An error occurred while preparing the command definition. See the inner exception for details. Source=System.Data.Entity StackTrace: at System.Data.Mapping.Update.Internal.UpdateTranslator.CreateCommand(DbModificationCommandTree commandTree) at System.Data.Mapping.Update.Internal.DynamicUpdateCommand.CreateCommand(UpdateTranslator translator, Dictionary 2 identifierValues） （UpdateTranslator翻譯，EntityConnection連接，字典2 identifierValues, List 1個generatedValues） 在System.Data.Mapping。 Update.Internal.UpdateTranslator.Update（IEntityStateManager stateManager，IEntityAdapter適配器） InnerException：System.NotSupportedException 消息= SQL Server Compact不支持服務器生成的密鑰和服務器生成的值。 源= System.Data.SqlServerCe.Entity 堆棧跟蹤： 在System.Data.SqlServerCe.SqlGen.DmlSqlGenerator.GenerateReturningSql（StringBuilder的CommandText中，DbModificationCommandTree樹，ExpressionTranslator翻譯，DbExpression返回） 在System.Data.SqlServerCe.SqlGen.DmlSqlGenerator .GenerateInsertSql（DbInsertCommandTree樹，列表參數，的CommandType &命令類型，布爾isLocalProvider） 在System.Data.SqlServerCe.SqlCeProviderServices.CreateCommand（DbProviderManifest providerManifest，DbCommandTree commandTree） 在System.Data.SqlServerCe.SqlCeProviderServices.CreateDbCommandDefinition（DbProviderManifest providerManifest，DbCommandTree commandTree） 在System.Data.Common.DbProviderServices.CreateCommandDefinition（DbCommandTree commandTree） 在System.Data.Common.DbProviderServices.CreateCommand（DbCommandTree commandTree） 在System.Data.Mapping.Update.Internal.UpdateTranslator.CreateCommand（DbModificationCommandTree commandTree） InnerException： `

Answer 1

總有一些替代品。問題是他們是否比數據庫好。您可以將數據存儲爲XML或自己的文件格式等。然後，您必須編寫適當的查詢，更新代碼等。可能沒問題 - 但我們不可能說沒有更多信息。

但是，即使在考慮另一種解決方案之前，我也會深究爲什麼會看到異常。你可能會有一些行爲你沒有真正預料到，當你改變了存儲層的時候，這些行爲同樣會傷害到你，而且在那時可能更難診斷。一旦你弄清楚了你目前的方法爲什麼不起作用，你就會更好地瞭解它是否值得改變。

Answer 2

如果您的數據量不是太多，那麼XML文件將起作用。很難說，但沒有更多的系統知識。

Answer 3

那麼使用關係數據庫的主要原因是爲了確保數據的完整性和關係。

如果你生活中可以沒有外鍵約束，只是把它存儲爲平面文件（EXCEL，XML等）

Answer 4

SQLite也是一個不錯的選擇。無需安裝服務器。

Answer 5

您選擇數據庫實施可能有一個很好的理由，特別是如果關係和完整性很重要。試着弄清楚爲什麼你會遇到異常 - 如果它是一個SQL CE的東西，那麼你可以考慮像ESE（Jet）這樣的替代品，它是所有Windows安裝的一部分，並且更加健壯。