public virtual ObjectQueryExecutionPlan Prepare(
ObjectContext context, DbQueryCommandTree tree, Type elementType, MergeOption mergeOption, Span span,
IEnumerable <Tuple <ObjectParameter, QueryParameterExpression> > compiledQueryParameters, AliasGenerator aliasGenerator)
{
var treeResultType = tree.Query.ResultType;
// Rewrite this tree for Span?
DbExpression spannedQuery = null;
SpanIndex spanInfo;
if (ObjectSpanRewriter.TryRewrite(tree, span, mergeOption, aliasGenerator, out spannedQuery, out spanInfo))
{
tree = DbQueryCommandTree.FromValidExpression(tree.MetadataWorkspace, tree.DataSpace, spannedQuery);
}
else
{
spanInfo = null;
}
var entityDefinition = CreateCommandDefinition(context, tree);
var cacheManager = context.Perspective.MetadataWorkspace.GetQueryCacheManager();
var shaperFactory = Translator.TranslateColumnMap(
_translator,
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)
EntitySet singleEntitySet = null;
// determine if the entity set is unambiguous given the entity type
if (treeResultType.EdmType.BuiltInTypeKind == BuiltInTypeKind.CollectionType &&
entityDefinition.EntitySets != null)
{
foreach (var entitySet in entityDefinition.EntitySets)
{
if (entitySet != null &&
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(
entityDefinition, shaperFactory, treeResultType, mergeOption, singleEntitySet, compiledQueryParameters));
}
public virtual ObjectQueryExecutionPlan Prepare(
ObjectContext context,
DbQueryCommandTree tree,
Type elementType,
MergeOption mergeOption,
bool streaming,
Span span,
IEnumerable <Tuple <ObjectParameter, QueryParameterExpression> > compiledQueryParameters,
AliasGenerator aliasGenerator)
{
TypeUsage resultType = tree.Query.ResultType;
DbExpression newQuery;
SpanIndex spanInfo;
if (ObjectSpanRewriter.TryRewrite(tree, span, mergeOption, aliasGenerator, out newQuery, out spanInfo))
{
tree = DbQueryCommandTree.FromValidExpression(tree.MetadataWorkspace, tree.DataSpace, newQuery, tree.UseDatabaseNullSemantics);
}
else
{
spanInfo = (SpanIndex)null;
}
EntityCommandDefinition commandDefinition = ObjectQueryExecutionPlanFactory.CreateCommandDefinition(context, tree);
ShaperFactory resultShaperFactory = System.Data.Entity.Core.Common.Internal.Materialization.Translator.TranslateColumnMap(this._translator, elementType, commandDefinition.CreateColumnMap((DbDataReader)null), context.MetadataWorkspace, spanInfo, mergeOption, streaming, false);
EntitySet singleEntitySet = (EntitySet)null;
if (resultType.EdmType.BuiltInTypeKind == BuiltInTypeKind.CollectionType && commandDefinition.EntitySets != null)
{
foreach (EntitySet entitySet in commandDefinition.EntitySets)
{
if (entitySet != null && entitySet.ElementType.IsAssignableFrom(((CollectionType)resultType.EdmType).TypeUsage.EdmType))
{
if (singleEntitySet == null)
{
singleEntitySet = entitySet;
}
else
{
singleEntitySet = (EntitySet)null;
break;
}
}
}
}
return(new ObjectQueryExecutionPlan((DbCommandDefinition)commandDefinition, resultShaperFactory, resultType, mergeOption, streaming, singleEntitySet, compiledQueryParameters));
}