Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Common / DBSchemaTable.cs / 1 / DBSchemaTable.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //----------------------------------------------------------------------------- namespace System.Data.Common { using System; using System.Data; using System.Data.ProviderBase; using System.Diagnostics; sealed internal class DbSchemaTable { private enum ColumnEnum { ColumnName, ColumnOrdinal, ColumnSize, BaseServerName, BaseCatalogName, BaseColumnName, BaseSchemaName, BaseTableName, IsAutoIncrement, IsUnique, IsKey, IsRowVersion, DataType, ProviderSpecificDataType, AllowDBNull, ProviderType, IsExpression, IsHidden, IsLong, IsReadOnly, SchemaMappingUnsortedIndex, } static readonly private string[] DBCOLUMN_NAME = new string[] { SchemaTableColumn.ColumnName, SchemaTableColumn.ColumnOrdinal, SchemaTableColumn.ColumnSize, SchemaTableOptionalColumn.BaseServerName, SchemaTableOptionalColumn.BaseCatalogName, SchemaTableColumn.BaseColumnName, SchemaTableColumn.BaseSchemaName, SchemaTableColumn.BaseTableName, SchemaTableOptionalColumn.IsAutoIncrement, SchemaTableColumn.IsUnique, SchemaTableColumn.IsKey, SchemaTableOptionalColumn.IsRowVersion, SchemaTableColumn.DataType, SchemaTableOptionalColumn.ProviderSpecificDataType, SchemaTableColumn.AllowDBNull, SchemaTableColumn.ProviderType, SchemaTableColumn.IsExpression, SchemaTableOptionalColumn.IsHidden, SchemaTableColumn.IsLong, SchemaTableOptionalColumn.IsReadOnly, DbSchemaRow.SchemaMappingUnsortedIndex, }; internal DataTable dataTable; private DataColumnCollection columns; private DataColumn[] columnCache = new DataColumn[DBCOLUMN_NAME.Length]; private bool _returnProviderSpecificTypes; internal DbSchemaTable(DataTable dataTable, bool returnProviderSpecificTypes) { this.dataTable = dataTable; this.columns = dataTable.Columns; _returnProviderSpecificTypes = returnProviderSpecificTypes; } internal DataColumn ColumnName { get { return CachedDataColumn(ColumnEnum.ColumnName);}} internal DataColumn Size { get { return CachedDataColumn(ColumnEnum.ColumnSize);}} internal DataColumn BaseServerName { get { return CachedDataColumn(ColumnEnum.BaseServerName);}} internal DataColumn BaseColumnName { get { return CachedDataColumn(ColumnEnum.BaseColumnName);}} internal DataColumn BaseTableName { get { return CachedDataColumn(ColumnEnum.BaseTableName);}} internal DataColumn BaseCatalogName { get { return CachedDataColumn(ColumnEnum.BaseCatalogName);}} internal DataColumn BaseSchemaName { get { return CachedDataColumn(ColumnEnum.BaseSchemaName);}} internal DataColumn IsAutoIncrement { get { return CachedDataColumn(ColumnEnum.IsAutoIncrement);}} internal DataColumn IsUnique { get { return CachedDataColumn(ColumnEnum.IsUnique);}} internal DataColumn IsKey { get { return CachedDataColumn(ColumnEnum.IsKey);}} internal DataColumn IsRowVersion { get { return CachedDataColumn(ColumnEnum.IsRowVersion);}} internal DataColumn AllowDBNull { get { return CachedDataColumn(ColumnEnum.AllowDBNull);}} internal DataColumn IsExpression { get { return CachedDataColumn(ColumnEnum.IsExpression);}} internal DataColumn IsHidden { get { return CachedDataColumn(ColumnEnum.IsHidden);}} internal DataColumn IsLong { get { return CachedDataColumn(ColumnEnum.IsLong);}} internal DataColumn IsReadOnly { get { return CachedDataColumn(ColumnEnum.IsReadOnly);}} internal DataColumn UnsortedIndex { get { return CachedDataColumn(ColumnEnum.SchemaMappingUnsortedIndex);}} internal DataColumn DataType { get { if (_returnProviderSpecificTypes) { return CachedDataColumn(ColumnEnum.ProviderSpecificDataType, ColumnEnum.DataType); } return CachedDataColumn(ColumnEnum.DataType); } } private DataColumn CachedDataColumn(ColumnEnum column) { return CachedDataColumn(column, column); } private DataColumn CachedDataColumn(ColumnEnum column, ColumnEnum column2) { DataColumn dataColumn = columnCache[(int) column]; if (null == dataColumn) { int index = columns.IndexOf(DBCOLUMN_NAME[(int) column]); if ((-1 == index) && (column != column2)) { index = columns.IndexOf(DBCOLUMN_NAME[(int) column2]); } if (-1 != index) { dataColumn = columns[index]; columnCache[(int) column] = dataColumn; } } return dataColumn; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- SlotInfo.cs
- Wildcard.cs
- Int16Storage.cs
- EnumMember.cs
- ParameterCollection.cs
- SmuggledIUnknown.cs
- DataGrid.cs
- StringValidator.cs
- DeleteStoreRequest.cs
- OutputCacheModule.cs
- ZipPackagePart.cs
- MediaTimeline.cs
- GridItemProviderWrapper.cs
- TemplateLookupAction.cs
- StringComparer.cs
- SchemaSetCompiler.cs
- StyleModeStack.cs
- SecurityPolicySection.cs
- StatusCommandUI.cs
- QilValidationVisitor.cs
- BaseTypeViewSchema.cs
- Cell.cs
- RelationshipConverter.cs
- RegexCode.cs
- OleDbPropertySetGuid.cs
- XhtmlBasicSelectionListAdapter.cs
- GenerateScriptTypeAttribute.cs
- HttpContext.cs
- DetailsView.cs
- PreProcessor.cs
- KeyBinding.cs
- MetabaseSettingsIis7.cs
- ControlAdapter.cs
- PolyLineSegmentFigureLogic.cs
- IteratorDescriptor.cs
- DecoratedNameAttribute.cs
- DataComponentGenerator.cs
- Variable.cs
- GridViewSortEventArgs.cs
- PropertySegmentSerializer.cs
- BlobPersonalizationState.cs
- FixedTextSelectionProcessor.cs
- XmlnsCache.cs
- CustomValidator.cs
- UnsafeNativeMethods.cs
- SqlDataSourceQueryEditor.cs
- Documentation.cs
- XmlSchemaProviderAttribute.cs
- TreeSet.cs
- DbConnectionPool.cs
- ToolZoneDesigner.cs
- AdjustableArrowCap.cs
- ToggleButtonAutomationPeer.cs
- MetafileEditor.cs
- EmptyEnumerator.cs
- SymbolEqualComparer.cs
- FieldCollectionEditor.cs
- DesignSurfaceEvent.cs
- _NestedSingleAsyncResult.cs
- XomlCompilerParameters.cs
- PropertyValueUIItem.cs
- OrthographicCamera.cs
- LOSFormatter.cs
- DiscreteKeyFrames.cs
- MediaContext.cs
- BinaryUtilClasses.cs
- XmlSubtreeReader.cs
- clipboard.cs
- InternalDispatchObject.cs
- ControlBindingsCollection.cs
- PropertyPath.cs
- CompoundFileIOPermission.cs
- MessagePropertyAttribute.cs
- AuthorizationRuleCollection.cs
- PathSegmentCollection.cs
- DateTimePickerDesigner.cs
- MdiWindowListItemConverter.cs
- BlockExpression.cs
- ClientFormsAuthenticationCredentials.cs
- linebase.cs
- CachedBitmap.cs
- EntityCollection.cs
- SafeProcessHandle.cs
- DataGridViewCellToolTipTextNeededEventArgs.cs
- CaseStatementProjectedSlot.cs
- OdbcEnvironmentHandle.cs
- TextTreeRootNode.cs
- InternalDispatchObject.cs
- MetadataWorkspace.cs
- QilInvokeEarlyBound.cs
- ResourceContainer.cs
- AVElementHelper.cs
- ListControlActionList.cs
- CacheChildrenQuery.cs
- LexicalChunk.cs
- DataRowCollection.cs
- InputProcessorProfilesLoader.cs
- CmsInterop.cs
- BoolExpressionVisitors.cs
- SelectionPatternIdentifiers.cs