Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Common / Utils / CommandHelper.cs / 1305376 / CommandHelper.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System.Diagnostics; using System.Data.Metadata.Edm; using System.Data.EntityClient; using System.Data.Objects; namespace System.Data.Common.Utils { ////// Contains utility methods for construction of DB commands through generic /// provider interfaces. /// internal static class CommandHelper { ////// Consumes all rows and result sets from the reader. This allows client to retrieve /// parameter values and intercept any store exceptions. /// /// reader to consume internal static void ConsumeReader(DbDataReader reader) { if (null != reader && !reader.IsClosed) { while (reader.NextResult()) { // Note that we only walk through the result sets. We don't need // to walk through individual rows (though underlying provider // implementation may do so) } } } ////// requires: commandText must not be null /// The command text must be in the form Container.FunctionImportName. /// internal static void ParseFunctionImportCommandText(string commandText, string defaultContainerName, out string containerName, out string functionImportName) { Debug.Assert(null != commandText); // Split the string string[] nameParts = commandText.Split('.'); containerName = null; functionImportName = null; if (2 == nameParts.Length) { containerName = nameParts[0].Trim(); functionImportName = nameParts[1].Trim(); } else if (1 == nameParts.Length && null != defaultContainerName) { containerName = defaultContainerName; functionImportName = nameParts[0].Trim(); } if (string.IsNullOrEmpty(containerName) || string.IsNullOrEmpty(functionImportName)) { throw EntityUtil.InvalidOperation(System.Data.Entity.Strings.EntityClient_InvalidStoredProcedureCommandText); } } ////// Given an entity command, returns the associated entity transaction and performs validation /// to ensure the transaction is consistent. /// /// Entity command instance. Must not be null. ///Entity transaction internal static EntityTransaction GetEntityTransaction(EntityCommand entityCommand) { Debug.Assert(null != entityCommand); EntityTransaction entityTransaction = (EntityTransaction)entityCommand.Transaction; // Check to make sure that either the command has no transaction associated with it, or it // matches the one used by the connection if (entityTransaction != null && entityTransaction != entityCommand.Connection.CurrentTransaction) { throw EntityUtil.InvalidOperation(System.Data.Entity.Strings.EntityClient_InvalidTransactionForCommand); } // Now we have asserted that EntityCommand either has no transaction or has one that matches the // one used in the connection, we can simply use the connection's transaction object entityTransaction = entityCommand.Connection.CurrentTransaction; return entityTransaction; } ////// Given an entity command and entity transaction, passes through relevant state to store provider /// command. /// /// Entity command. Must not be null. /// Entity transaction. Must not be null. /// Store provider command that is being setup. Must not be null. internal static void SetStoreProviderCommandState(EntityCommand entityCommand, EntityTransaction entityTransaction, DbCommand storeProviderCommand) { Debug.Assert(null != entityCommand); Debug.Assert(null != storeProviderCommand); storeProviderCommand.CommandTimeout = entityCommand.CommandTimeout; storeProviderCommand.Connection = ((EntityConnection)entityCommand.Connection).StoreConnection; storeProviderCommand.Transaction = (null != entityTransaction) ? entityTransaction.StoreTransaction : null; storeProviderCommand.UpdatedRowSource = entityCommand.UpdatedRowSource; } ////// Given an entity command and store provider command, sets all output parameter values on the entity command. /// /// Entity command on which to set parameter values. Must not be null. /// Store provider command from which to retrieve parameter values. Must not /// be null. internal static void SetEntityParameterValues(EntityCommand entityCommand, DbCommand storeProviderCommand) { Debug.Assert(null != entityCommand); Debug.Assert(null != storeProviderCommand); foreach (DbParameter storeParameter in storeProviderCommand.Parameters) { ParameterDirection direction = storeParameter.Direction; if (0 != (direction & ParameterDirection.Output)) { // if the entity command also defines the parameter, propagate store parameter value // to entity parameter int parameterOrdinal = entityCommand.Parameters.IndexOf(storeParameter.ParameterName); if (0 <= parameterOrdinal) { EntityParameter entityParameter = entityCommand.Parameters[parameterOrdinal]; entityParameter.Value = storeParameter.Value; } } } } // requires: all arguments must be given internal static EdmFunction FindFunctionImport(MetadataWorkspace workspace, string containerName, string functionImportName) { Debug.Assert(null != workspace && null != containerName && null != functionImportName); // find entity container EntityContainer entityContainer; if (!workspace.TryGetEntityContainer(containerName, DataSpace.CSpace, out entityContainer)) { throw EntityUtil.InvalidOperation(System.Data.Entity.Strings.EntityClient_UnableToFindFunctionImportContainer( containerName)); } // find function import EdmFunction functionImport = null; foreach (EdmFunction candidate in entityContainer.FunctionImports) { if (candidate.Name == functionImportName) { functionImport = candidate; break; } } if (null == functionImport) { throw EntityUtil.InvalidOperation(System.Data.Entity.Strings.EntityClient_UnableToFindFunctionImport( containerName, functionImportName)); } return functionImport; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- SiteMapPath.cs
- DataControlPagerLinkButton.cs
- baseaxisquery.cs
- ContainerUIElement3D.cs
- DashStyles.cs
- IResourceProvider.cs
- WindowsHyperlink.cs
- IChannel.cs
- ButtonBaseAutomationPeer.cs
- Clipboard.cs
- WebBrowserContainer.cs
- PropertyContainer.cs
- CacheAxisQuery.cs
- RequestSecurityTokenSerializer.cs
- DiagnosticTraceSchemas.cs
- StatusStrip.cs
- BoolExpr.cs
- CanonicalFormWriter.cs
- StagingAreaInputItem.cs
- CodeTypeDeclarationCollection.cs
- SafeFileMappingHandle.cs
- XmlEntityReference.cs
- ProcessingInstructionAction.cs
- CacheRequest.cs
- ItemCheckedEvent.cs
- X509ChainPolicy.cs
- ObjectAssociationEndMapping.cs
- BufferedWebEventProvider.cs
- ProcessManager.cs
- JavaScriptSerializer.cs
- MergeLocalizationDirectives.cs
- Span.cs
- TextAutomationPeer.cs
- EpmContentDeSerializerBase.cs
- COMException.cs
- UpDownBase.cs
- Button.cs
- CalendarData.cs
- unsafenativemethodsother.cs
- ComPlusTraceRecord.cs
- XmlAttribute.cs
- ButtonRenderer.cs
- HttpCapabilitiesEvaluator.cs
- LiteralControl.cs
- StickyNoteContentControl.cs
- ObjectRef.cs
- XmlToDatasetMap.cs
- Compensation.cs
- StringToken.cs
- PageThemeBuildProvider.cs
- ServiceDescription.cs
- XmlSchemaDocumentation.cs
- PieceDirectory.cs
- NamedPipeChannelFactory.cs
- infer.cs
- ProjectionCamera.cs
- DetailsViewModeEventArgs.cs
- VectorCollection.cs
- BookmarkScopeInfo.cs
- MatrixStack.cs
- XmlArrayAttribute.cs
- CorrelationResolver.cs
- Grant.cs
- PropertyChangedEventArgs.cs
- Propagator.Evaluator.cs
- ScriptComponentDescriptor.cs
- ValidationResult.cs
- EndpointNameMessageFilter.cs
- CodeTypeDelegate.cs
- GiveFeedbackEvent.cs
- EndEvent.cs
- ModelProperty.cs
- VariableAction.cs
- Error.cs
- BindingMAnagerBase.cs
- XmlBinaryReader.cs
- DrawingContextDrawingContextWalker.cs
- GuidelineSet.cs
- WebPartVerbCollection.cs
- EventBuilder.cs
- AsymmetricSecurityProtocolFactory.cs
- HttpFileCollection.cs
- LinearGradientBrush.cs
- QilFunction.cs
- QueryRelOp.cs
- _AuthenticationState.cs
- MissingMemberException.cs
- VectorAnimationUsingKeyFrames.cs
- _HTTPDateParse.cs
- SystemColorTracker.cs
- TableLayoutPanel.cs
- UpDownEvent.cs
- ObjRef.cs
- EntityContainer.cs
- entitydatasourceentitysetnameconverter.cs
- mansign.cs
- DefaultBindingPropertyAttribute.cs
- SecurityTokenTypes.cs
- HitTestParameters.cs
- ExtensionWindowHeader.cs