Code:
/ DotNET / DotNET / 8.0 / 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.
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