126 lines
5.5 KiB
C#
126 lines
5.5 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="DBSchemaTable.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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// <owner current="true" primary="true">[....]</owner>
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// <owner current="true" primary="false">[....]</owner>
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//------------------------------------------------------------------------------
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namespace System.Data.Common {
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using System;
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using System.Data;
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using System.Data.ProviderBase;
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using System.Diagnostics;
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sealed internal class DbSchemaTable {
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private enum ColumnEnum {
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ColumnName,
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ColumnOrdinal,
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ColumnSize,
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BaseServerName,
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BaseCatalogName,
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BaseColumnName,
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BaseSchemaName,
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BaseTableName,
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IsAutoIncrement,
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IsUnique,
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IsKey,
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IsRowVersion,
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DataType,
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ProviderSpecificDataType,
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AllowDBNull,
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ProviderType,
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IsExpression,
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IsHidden,
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IsLong,
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IsReadOnly,
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SchemaMappingUnsortedIndex,
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}
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static readonly private string[] DBCOLUMN_NAME = new string[] {
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SchemaTableColumn.ColumnName,
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SchemaTableColumn.ColumnOrdinal,
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SchemaTableColumn.ColumnSize,
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SchemaTableOptionalColumn.BaseServerName,
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SchemaTableOptionalColumn.BaseCatalogName,
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SchemaTableColumn.BaseColumnName,
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SchemaTableColumn.BaseSchemaName,
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SchemaTableColumn.BaseTableName,
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SchemaTableOptionalColumn.IsAutoIncrement,
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SchemaTableColumn.IsUnique,
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SchemaTableColumn.IsKey,
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SchemaTableOptionalColumn.IsRowVersion,
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SchemaTableColumn.DataType,
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SchemaTableOptionalColumn.ProviderSpecificDataType,
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SchemaTableColumn.AllowDBNull,
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SchemaTableColumn.ProviderType,
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SchemaTableColumn.IsExpression,
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SchemaTableOptionalColumn.IsHidden,
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SchemaTableColumn.IsLong,
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SchemaTableOptionalColumn.IsReadOnly,
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DbSchemaRow.SchemaMappingUnsortedIndex,
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};
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internal DataTable dataTable;
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private DataColumnCollection columns;
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private DataColumn[] columnCache = new DataColumn[DBCOLUMN_NAME.Length];
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private bool _returnProviderSpecificTypes;
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internal DbSchemaTable(DataTable dataTable, bool returnProviderSpecificTypes) {
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this.dataTable = dataTable;
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this.columns = dataTable.Columns;
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_returnProviderSpecificTypes = returnProviderSpecificTypes;
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}
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internal DataColumn ColumnName { get { return CachedDataColumn(ColumnEnum.ColumnName);}}
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internal DataColumn Size { get { return CachedDataColumn(ColumnEnum.ColumnSize);}}
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internal DataColumn BaseServerName { get { return CachedDataColumn(ColumnEnum.BaseServerName);}}
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internal DataColumn BaseColumnName { get { return CachedDataColumn(ColumnEnum.BaseColumnName);}}
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internal DataColumn BaseTableName { get { return CachedDataColumn(ColumnEnum.BaseTableName);}}
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internal DataColumn BaseCatalogName { get { return CachedDataColumn(ColumnEnum.BaseCatalogName);}}
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internal DataColumn BaseSchemaName { get { return CachedDataColumn(ColumnEnum.BaseSchemaName);}}
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internal DataColumn IsAutoIncrement { get { return CachedDataColumn(ColumnEnum.IsAutoIncrement);}}
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internal DataColumn IsUnique { get { return CachedDataColumn(ColumnEnum.IsUnique);}}
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internal DataColumn IsKey { get { return CachedDataColumn(ColumnEnum.IsKey);}}
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internal DataColumn IsRowVersion { get { return CachedDataColumn(ColumnEnum.IsRowVersion);}}
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internal DataColumn AllowDBNull { get { return CachedDataColumn(ColumnEnum.AllowDBNull);}}
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internal DataColumn IsExpression { get { return CachedDataColumn(ColumnEnum.IsExpression);}}
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internal DataColumn IsHidden { get { return CachedDataColumn(ColumnEnum.IsHidden);}}
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internal DataColumn IsLong { get { return CachedDataColumn(ColumnEnum.IsLong);}}
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internal DataColumn IsReadOnly { get { return CachedDataColumn(ColumnEnum.IsReadOnly);}}
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internal DataColumn UnsortedIndex { get { return CachedDataColumn(ColumnEnum.SchemaMappingUnsortedIndex);}}
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internal DataColumn DataType {
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get {
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if (_returnProviderSpecificTypes) {
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return CachedDataColumn(ColumnEnum.ProviderSpecificDataType, ColumnEnum.DataType);
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}
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return CachedDataColumn(ColumnEnum.DataType);
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}
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}
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private DataColumn CachedDataColumn(ColumnEnum column) {
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return CachedDataColumn(column, column);
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}
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private DataColumn CachedDataColumn(ColumnEnum column, ColumnEnum column2) {
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DataColumn dataColumn = columnCache[(int) column];
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if (null == dataColumn) {
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int index = columns.IndexOf(DBCOLUMN_NAME[(int) column]);
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if ((-1 == index) && (column != column2)) {
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index = columns.IndexOf(DBCOLUMN_NAME[(int) column2]);
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}
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if (-1 != index) {
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dataColumn = columns[index];
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columnCache[(int) column] = dataColumn;
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}
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}
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return dataColumn;
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}
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}
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}
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