Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / ndp / fx / src / DataEntity / System / Data / Objects / Internal / ObjectQueryExecutionPlan.cs / 1 / 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;
///
/// 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;
/// If the query yields entities from a single entity set, the value is stored here.
private readonly EntitySet _singleEntitySet;
internal ObjectQueryExecutionPlan(DbCommandDefinition commandDefinition, ShaperFactory resultShaperFactory, TypeUsage resultType, MergeOption mergeOption, EntitySet singleEntitySet)
{
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;
}
internal static ObjectQueryExecutionPlan Prepare(ObjectContext context, DbQueryCommandTree tree, Type elementType, MergeOption mergeOption, Span span)
{
TypeUsage treeResultType = tree.Query.ResultType;
// Rewrite this tree for Span?
DbExpression spannedQuery = null;
SpanIndex spanInfo;
if (ObjectSpanRewriter.TryRewrite(tree.Query, span, mergeOption, out spannedQuery, out spanInfo))
{
tree.Query = 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);
}
internal string ToTraceString()
{
string traceString = string.Empty;
EntityCommandDefinition entityCommandDef = this.CommandDefinition as EntityCommandDefinition;
if (entityCommandDef != null)
{
traceString = entityCommandDef.ToTraceString();
}
return traceString;
}
internal ObjectResult Execute(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);
// 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);
return execPlan.Execute(context, null);
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//----------------------------------------------------------------------
//
// 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;
///
/// 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;
/// If the query yields entities from a single entity set, the value is stored here.
private readonly EntitySet _singleEntitySet;
internal ObjectQueryExecutionPlan(DbCommandDefinition commandDefinition, ShaperFactory resultShaperFactory, TypeUsage resultType, MergeOption mergeOption, EntitySet singleEntitySet)
{
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;
}
internal static ObjectQueryExecutionPlan Prepare(ObjectContext context, DbQueryCommandTree tree, Type elementType, MergeOption mergeOption, Span span)
{
TypeUsage treeResultType = tree.Query.ResultType;
// Rewrite this tree for Span?
DbExpression spannedQuery = null;
SpanIndex spanInfo;
if (ObjectSpanRewriter.TryRewrite(tree.Query, span, mergeOption, out spannedQuery, out spanInfo))
{
tree.Query = 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);
}
internal string ToTraceString()
{
string traceString = string.Empty;
EntityCommandDefinition entityCommandDef = this.CommandDefinition as EntityCommandDefinition;
if (entityCommandDef != null)
{
traceString = entityCommandDef.ToTraceString();
}
return traceString;
}
internal ObjectResult Execute(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);
// 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);
return execPlan.Execute(context, null);
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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