Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Objects / Internal / ObjectQueryExecutionPlan.cs / 1305376 / ObjectQueryExecutionPlan.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] //--------------------------------------------------------------------- namespace System.Data.Objects.Internal { using System; using System.Collections.Generic; using System.Data.Common; using System.Data.Common.CommandTrees; using System.Data.Common.EntitySql; using System.Data.Common.QueryCache; using System.Data.EntityClient; using System.Data.Metadata.Edm; using System.Data.Objects; using System.Data.Objects.DataClasses; using System.Diagnostics; using System.Reflection; using System.Linq.Expressions; using System.Data.Common.Internal.Materialization; using System.Data.Query.InternalTrees; using CompiledQueryParameters = System.Collections.ObjectModel.ReadOnlyCollection>; /// /// Represents the 'compiled' form of all elements (query + result assembly) required to execute a specific internal sealed class ObjectQueryExecutionPlan { internal readonly DbCommandDefinition CommandDefinition; internal readonly ShaperFactory ResultShaperFactory; internal readonly TypeUsage ResultType; internal readonly MergeOption MergeOption; internal readonly CompiledQueryParameters CompiledQueryParameters; ////// If the query yields entities from a single entity set, the value is stored here. private readonly EntitySet _singleEntitySet; private ObjectQueryExecutionPlan(DbCommandDefinition commandDefinition, ShaperFactory resultShaperFactory, TypeUsage resultType, MergeOption mergeOption, EntitySet singleEntitySet, CompiledQueryParameters compiledQueryParameters) { Debug.Assert(commandDefinition != null, "A command definition is required"); Debug.Assert(resultShaperFactory != null, "A result shaper factory is required"); Debug.Assert(resultType != null, "A result type is required"); this.CommandDefinition = commandDefinition; this.ResultShaperFactory = resultShaperFactory; this.ResultType = resultType; this.MergeOption = mergeOption; this._singleEntitySet = singleEntitySet; this.CompiledQueryParameters = compiledQueryParameters; } internal static ObjectQueryExecutionPlan Prepare(ObjectContext context, DbQueryCommandTree tree, Type elementType, MergeOption mergeOption, Span span, CompiledQueryParameters compiledQueryParameters) { TypeUsage treeResultType = tree.Query.ResultType; // Rewrite this tree for Span? DbExpression spannedQuery = null; SpanIndex spanInfo; if (ObjectSpanRewriter.TryRewrite(tree, span, mergeOption, out spannedQuery, out spanInfo)) { tree = DbQueryCommandTree.FromValidExpression(tree.MetadataWorkspace, tree.DataSpace, spannedQuery); } else { spanInfo = null; } DbConnection connection = context.Connection; DbCommandDefinition definition = null; // The connection is required to get to the CommandDefinition builder. if (connection == null) { throw EntityUtil.InvalidOperation(System.Data.Entity.Strings.ObjectQuery_InvalidConnection); } DbProviderServices services = DbProviderServices.GetProviderServices(connection); try { definition = services.CreateCommandDefinition(tree); } catch (EntityCommandCompilationException) { // If we're running against EntityCommand, we probably already caught the providers' // exception and wrapped it, we don't want to do that again, so we'll just rethrow // here instead. throw; } catch (Exception e) { // we should not be wrapping all exceptions if (EntityUtil.IsCatchableExceptionType(e)) { // we don't wan't folks to have to know all the various types of exceptions that can // occur, so we just rethrow a CommandDefinitionException and make whatever we caught // the inner exception of it. throw EntityUtil.CommandCompilation(System.Data.Entity.Strings.EntityClient_CommandDefinitionPreparationFailed, e); } throw; } if (definition == null) { throw EntityUtil.ProviderDoesNotSupportCommandTrees(); } EntityCommandDefinition entityDefinition = (EntityCommandDefinition)definition; QueryCacheManager cacheManager = context.Perspective.MetadataWorkspace.GetQueryCacheManager(); ShaperFactory shaperFactory = ShaperFactory.Create(elementType, cacheManager, entityDefinition.CreateColumnMap(null), context.MetadataWorkspace, spanInfo, mergeOption, false); // attempt to determine entity information for this query (e.g. which entity type and which entity set) //EntityType rootEntityType = null; EntitySet singleEntitySet = null; if (treeResultType.EdmType.BuiltInTypeKind == BuiltInTypeKind.CollectionType) { // determine if the entity set is unambiguous given the entity type if (null != entityDefinition.EntitySets) { foreach (EntitySet entitySet in entityDefinition.EntitySets) { if (null != entitySet) { if (entitySet.ElementType.IsAssignableFrom(((CollectionType)treeResultType.EdmType).TypeUsage.EdmType)) { if (singleEntitySet == null) { // found a single match singleEntitySet = entitySet; } else { // there's more than one matching entity set singleEntitySet = null; break; } } } } } } return new ObjectQueryExecutionPlan(definition, shaperFactory, treeResultType, mergeOption, singleEntitySet, compiledQueryParameters); } internal string ToTraceString() { string traceString = string.Empty; EntityCommandDefinition entityCommandDef = this.CommandDefinition as EntityCommandDefinition; if (entityCommandDef != null) { traceString = entityCommandDef.ToTraceString(); } return traceString; } internal ObjectResultExecute (ObjectContext context, ObjectParameterCollection parameterValues) { DbDataReader storeReader = null; try { // create entity command (just do this to snarf store command) EntityCommandDefinition commandDefinition = (EntityCommandDefinition)this.CommandDefinition; EntityCommand entityCommand = new EntityCommand((EntityConnection)context.Connection, commandDefinition); // pass through parameters and timeout values if (context.CommandTimeout.HasValue) { entityCommand.CommandTimeout = context.CommandTimeout.Value; } if (parameterValues != null) { foreach (ObjectParameter parameter in parameterValues) { int index = entityCommand.Parameters.IndexOf(parameter.Name); if (index != -1) { entityCommand.Parameters[index].Value = parameter.Value ?? DBNull.Value; } } } // acquire store reader storeReader = commandDefinition.ExecuteStoreCommands(entityCommand, CommandBehavior.Default); ShaperFactory shaperFactory = (ShaperFactory )this.ResultShaperFactory; Shaper shaper = shaperFactory.Create(storeReader, context, context.MetadataWorkspace, this.MergeOption, true); // create materializer delegate TypeUsage resultItemEdmType; if (ResultType.EdmType.BuiltInTypeKind == BuiltInTypeKind.CollectionType) { resultItemEdmType = ((CollectionType)ResultType.EdmType).TypeUsage; } else { resultItemEdmType = ResultType; } return new ObjectResult (shaper, this._singleEntitySet, resultItemEdmType); } catch (Exception) { if (null != storeReader) { // Note: The caller is responsible for disposing reader if creating // the enumerator fails. storeReader.Dispose(); } throw; } } internal static ObjectResult ExecuteCommandTree (ObjectContext context, DbQueryCommandTree query, MergeOption mergeOption) { Debug.Assert(context != null, "ObjectContext cannot be null"); Debug.Assert(query != null, "Command tree cannot be null"); ObjectQueryExecutionPlan execPlan = ObjectQueryExecutionPlan.Prepare(context, query, typeof(TResultType), mergeOption, null, null); return execPlan.Execute (context, null); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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