/// <summary> /// ScalarColumnMap /// </summary> /// <param name="columnMap"></param> /// <param name="replacementVarMap"></param> /// <returns></returns> internal override ColumnMap Visit(ScalarColumnMap columnMap, VarMap replacementVarMap) { return(new ScalarColumnMap(columnMap.Type, columnMap.Name, columnMap.CommandId, columnMap.ColumnPos)); }
internal abstract TResultType Visit(ScalarColumnMap columnMap, TArgType arg);
/// <summary> /// Requires: a public type with a public, default constructor. Returns a column map initializing the type /// and all properties of the type with a public setter taking a primitive type and having a corresponding /// column in the reader. /// </summary> internal static CollectionColumnMap CreateColumnMapFromReaderAndClrType(DbDataReader reader, Type type, MetadataWorkspace workspace) { Debug.Assert(null != reader); Debug.Assert(null != type); Debug.Assert(null != workspace); // we require a default constructor ConstructorInfo constructor = type.GetConstructor(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance, null, Type.EmptyTypes, null); if (type.IsAbstract || (null == constructor && !type.IsValueType)) { throw EntityUtil.InvalidOperation( Strings.ObjectContext_InvalidTypeForStoreQuery(type)); } // build a LINQ expression used by result assembly to create results var memberInfo = new List <Tuple <MemberAssignment, int, EdmProperty> >(); foreach (PropertyInfo prop in type.GetProperties(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance)) { // for enums unwrap the type if nullable var propertyUnderlyingType = Nullable.GetUnderlyingType(prop.PropertyType) ?? prop.PropertyType; Type propType = propertyUnderlyingType.IsEnum ? propertyUnderlyingType.GetEnumUnderlyingType() : prop.PropertyType; EdmType modelType; int ordinal; if (TryGetColumnOrdinalFromReader(reader, prop.Name, out ordinal) && MetadataHelper.TryDetermineCSpaceModelType(propType, workspace, out modelType) && (Helper.IsScalarType(modelType)) && prop.CanWrite && prop.GetIndexParameters().Length == 0 && null != prop.GetSetMethod(/* nonPublic */ true)) { memberInfo.Add(Tuple.Create( Expression.Bind(prop, Expression.Parameter(prop.PropertyType, "placeholder")), ordinal, new EdmProperty(prop.Name, TypeUsage.Create(modelType)))); } } // initialize members in the order in which they appear in the reader MemberInfo[] members = new MemberInfo[memberInfo.Count]; MemberBinding[] memberBindings = new MemberBinding[memberInfo.Count]; ColumnMap[] propertyMaps = new ColumnMap[memberInfo.Count]; EdmProperty[] modelProperties = new EdmProperty[memberInfo.Count]; int i = 0; foreach (var memberGroup in memberInfo.GroupBy(tuple => tuple.Item2).OrderBy(tuple => tuple.Key)) { // make sure that a single column isn't contributing to multiple properties if (memberGroup.Count() != 1) { throw EntityUtil.InvalidOperation(Strings.ObjectContext_TwoPropertiesMappedToSameColumn( reader.GetName(memberGroup.Key), String.Join(", ", memberGroup.Select(tuple => tuple.Item3.Name).ToArray()))); } var member = memberGroup.Single(); MemberAssignment assignment = member.Item1; int ordinal = member.Item2; EdmProperty modelProp = member.Item3; members[i] = assignment.Member; memberBindings[i] = assignment; propertyMaps[i] = new ScalarColumnMap(modelProp.TypeUsage, modelProp.Name, 0, ordinal); modelProperties[i] = modelProp; i++; } NewExpression newExpr = null == constructor?Expression.New(type) : Expression.New(constructor); MemberInitExpression init = Expression.MemberInit(newExpr, memberBindings); InitializerMetadata initMetadata = InitializerMetadata.CreateProjectionInitializer( (EdmItemCollection)workspace.GetItemCollection(DataSpace.CSpace), init, members); // column map (a collection of rows with InitializerMetadata markup) RowType rowType = new RowType(modelProperties, initMetadata); RecordColumnMap rowMap = new RecordColumnMap(TypeUsage.Create(rowType), "DefaultTypeProjection", propertyMaps, null); CollectionColumnMap collectionMap = new SimpleCollectionColumnMap(rowType.GetCollectionType().TypeUsage, rowType.Name, rowMap, null, null); return(collectionMap); }
internal virtual void Visit(ScalarColumnMap columnMap, TArgType arg) { }