/// <summary>
/// Determines the store type for a function import.
/// </summary>
private TypeUsage DetermineStoreResultType(
FunctionImportMappingNonComposable mapping, int resultSetIndex, out IColumnMapGenerator columnMapGenerator)
{
// Determine column maps and infer result types for the mapped function. There are four varieties:
// Collection(Entity)
// Collection(PrimitiveType)
// Collection(ComplexType)
// No result type
TypeUsage storeResultType;
{
StructuralType baseStructuralType;
var functionImport = mapping.FunctionImport;
// Collection(Entity) or Collection(ComplexType)
if (MetadataHelper.TryGetFunctionImportReturnType(functionImport, resultSetIndex, out baseStructuralType))
{
ValidateEdmResultType(baseStructuralType, functionImport);
//Note: Defensive check for historic reasons, we expect functionImport.EntitySets.Count > resultSetIndex
var entitySet = functionImport.EntitySets.Count > resultSetIndex ? functionImport.EntitySets[resultSetIndex] : null;
columnMapGenerator = new FunctionColumnMapGenerator(
mapping, resultSetIndex, entitySet, baseStructuralType, _columnMapFactory);
// We don't actually know the return type for the stored procedure, but we can infer
// one based on the mapping (i.e.: a column for every property of the mapped types
// and for all discriminator columns)
storeResultType = mapping.GetExpectedTargetResultType(resultSetIndex);
}
// Collection(PrimitiveType)
else
{
var returnParameter = MetadataHelper.GetReturnParameter(functionImport, resultSetIndex);
if (returnParameter != null &&
returnParameter.TypeUsage != null)
{
// Get metadata description of the return type
storeResultType = returnParameter.TypeUsage;
Debug.Assert(
storeResultType.EdmType.BuiltInTypeKind == BuiltInTypeKind.CollectionType,
"FunctionImport currently supports only collection result type");
var elementType = ((CollectionType)storeResultType.EdmType).TypeUsage;
Debug.Assert(
Helper.IsScalarType(elementType.EdmType),
"FunctionImport supports only Collection(Entity), Collection(Enum) and Collection(Primitive)");
// Build collection column map where the first column of the store result is assumed
// to contain the primitive type values.
var scalarColumnMap = new ScalarColumnMap(elementType, string.Empty, 0, 0);
var collectionColumnMap = new SimpleCollectionColumnMap(
storeResultType,
string.Empty, scalarColumnMap, null, null);
columnMapGenerator = new ConstantColumnMapGenerator(collectionColumnMap, 1);
}
// No result type
else
{
storeResultType = null;
columnMapGenerator = new ConstantColumnMapGenerator(null, 0);
}
}
}
return(storeResultType);
}
/// <summary>
/// Determines the store type for a function import.
/// </summary>
private TypeUsage DetermineStoreResultType(MetadataWorkspace workspace, FunctionImportMappingNonComposable mapping, int resultSetIndex, out IColumnMapGenerator columnMapGenerator) {
// Determine column maps and infer result types for the mapped function. There are four varieties:
// Collection(Entity)
// Collection(PrimitiveType)
// Collection(ComplexType)
// No result type
TypeUsage storeResultType;
{
StructuralType baseStructuralType;
EdmFunction functionImport = mapping.FunctionImport;
// Collection(Entity) or Collection(ComplexType)
if (MetadataHelper.TryGetFunctionImportReturnType<StructuralType>(functionImport, resultSetIndex, out baseStructuralType))
{
ValidateEdmResultType(baseStructuralType, functionImport);
//Note: Defensive check for historic reasons, we expect functionImport.EntitySets.Count > resultSetIndex
EntitySet entitySet = functionImport.EntitySets.Count > resultSetIndex ? functionImport.EntitySets[resultSetIndex] : null;
columnMapGenerator = new FunctionColumnMapGenerator(mapping, resultSetIndex, entitySet, baseStructuralType);
// We don't actually know the return type for the stored procedure, but we can infer
// one based on the mapping (i.e.: a column for every property of the mapped types
// and for all discriminator columns)
storeResultType = mapping.GetExpectedTargetResultType(workspace, resultSetIndex);
}
// Collection(PrimitiveType)
else
{
FunctionParameter returnParameter = MetadataHelper.GetReturnParameter(functionImport, resultSetIndex);
if (returnParameter != null && returnParameter.TypeUsage != null)
{
// Get metadata description of the return type
storeResultType = returnParameter.TypeUsage;
Debug.Assert(storeResultType.EdmType.BuiltInTypeKind == BuiltInTypeKind.CollectionType, "FunctionImport currently supports only collection result type");
TypeUsage elementType = ((CollectionType)storeResultType.EdmType).TypeUsage;
Debug.Assert(Helper.IsScalarType(elementType.EdmType)
, "FunctionImport supports only Collection(Entity), Collection(Enum) and Collection(Primitive)");
// Build collection column map where the first column of the store result is assumed
// to contain the primitive type values.
ScalarColumnMap scalarColumnMap = new ScalarColumnMap(elementType, string.Empty, 0, 0);
SimpleCollectionColumnMap collectionColumnMap = new SimpleCollectionColumnMap(storeResultType,
string.Empty, scalarColumnMap, null, null);
columnMapGenerator = new ConstantColumnMapGenerator(collectionColumnMap, 1);
}
// No result type
else
{
storeResultType = null;
columnMapGenerator = new ConstantColumnMapGenerator(null, 0);
}
}
}
return storeResultType;
}
