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Imported Upstream version 4.6.0.125
Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4
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//------------------------------------------------------------------------------
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// <copyright file="DbProviderFactories.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.Collections;
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using System.Configuration;
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using System.Data;
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using System.Diagnostics;
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using System.Globalization;
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using System.Xml;
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public static class DbProviderFactories {
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private const string AssemblyQualifiedName = "AssemblyQualifiedName";
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private const string Instance = "Instance";
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private const string InvariantName = "InvariantName";
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private const string Name = "Name";
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private const string Description = "Description";
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private static ConnectionState _initState; // closed, connecting, open
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private static DataTable _providerTable;
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private static object _lockobj = new object();
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static public DbProviderFactory GetFactory(string providerInvariantName) {
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ADP.CheckArgumentLength(providerInvariantName, "providerInvariantName");
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// NOTES: Include the Framework Providers and any other Providers listed in the config file.
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DataTable providerTable = GetProviderTable();
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if (null != providerTable) {
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// we don't need to copy the DataTable because its used in a controlled fashion
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// also we don't need to create a blank datatable because we know the information won't exist
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#if DEBUG
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DataColumn[] pkey = providerTable.PrimaryKey;
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Debug.Assert(null != providerTable.Columns[InvariantName], "missing primary key column");
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Debug.Assert((null != pkey) && (1 == pkey.Length) && (InvariantName == pkey[0].ColumnName), "bad primary key");
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#endif
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DataRow providerRow = providerTable.Rows.Find(providerInvariantName);
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if (null != providerRow) {
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return DbProviderFactories.GetFactory(providerRow);
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}
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}
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throw ADP.ConfigProviderNotFound();
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}
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static public DbProviderFactory GetFactory(DataRow providerRow) {
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ADP.CheckArgumentNull(providerRow, "providerRow");
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// fail with ConfigProviderMissing rather than ColumnNotInTheTable exception
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DataColumn column = providerRow.Table.Columns[AssemblyQualifiedName];
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if (null != column) {
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// column value may not be a string
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string assemblyQualifiedName = providerRow[column] as string;
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if (!ADP.IsEmpty(assemblyQualifiedName)) {
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// FXCop is concerned about the following line call to Get Type,
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// If this code is deemed safe during our security review we should add this warning to our exclusion list.
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// FXCop Message, pertaining to the call to GetType.
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//
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// Secure late-binding methods,System.Data.dll!System.Data.Common.DbProviderFactories.GetFactory(System.Data.DataRow):System.Data.Common.DbProviderFactory,
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Type providerType = Type.GetType(assemblyQualifiedName);
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if (null != providerType) {
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System.Reflection.FieldInfo providerInstance = providerType.GetField(Instance, System.Reflection.BindingFlags.DeclaredOnly|System.Reflection.BindingFlags.Public|System.Reflection.BindingFlags.Static);
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if (null != providerInstance) {
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Debug.Assert(providerInstance.IsPublic, "field not public");
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Debug.Assert(providerInstance.IsStatic, "field not static");
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if (providerInstance.FieldType.IsSubclassOf(typeof(DbProviderFactory))) {
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object factory = providerInstance.GetValue(null);
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if (null != factory) {
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return (DbProviderFactory)factory;
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}
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// else throw ConfigProviderInvalid
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}
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// else throw ConfigProviderInvalid
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}
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throw ADP.ConfigProviderInvalid();
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}
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throw ADP.ConfigProviderNotInstalled();
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}
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// else throw ConfigProviderMissing
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}
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throw ADP.ConfigProviderMissing();
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}
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static public DbProviderFactory GetFactory(DbConnection connection) {
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ADP.CheckArgumentNull(connection, "connection");
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return connection.ProviderFactory;
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}
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static public DataTable GetFactoryClasses() { // V1.2.3300
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// NOTES: Include the Framework Providers and any other Providers listed in the config file.
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DataTable dataTable = GetProviderTable();
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if (null != dataTable) {
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dataTable = dataTable.Copy();
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}
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else {
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dataTable = DbProviderFactoriesConfigurationHandler.CreateProviderDataTable();
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}
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return dataTable;
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}
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// VSTFDevDiv # 624213: System.Data.Common.DbProviderFactories.GetFactoryClasses() still gets OracleClient provider in ClientSku environment.
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static private DataTable IncludeFrameworkFactoryClasses(DataTable configDataTable)
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{
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DataTable dataTable = DbProviderFactoriesConfigurationHandler.CreateProviderDataTable();
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// NOTES: Adding the following Framework DbProviderFactories
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// <add name="Odbc Data Provider" invariant="System.Data.Odbc" description=".Net Framework Data Provider for Odbc" type="System.Data.Odbc.OdbcFactory, System.Data, Version=%ASSEMBLY_VERSION%, Culture=neutral, PublicKeyToken=%ECMA_PUBLICKEY%"/>
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// <add name="OleDb Data Provider" invariant="System.Data.OleDb" description=".Net Framework Data Provider for OleDb" type="System.Data.OleDb.OleDbFactory, System.Data, Version=%ASSEMBLY_VERSION%, Culture=neutral, PublicKeyToken=%ECMA_PUBLICKEY%"/>
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// <add name="OracleClient Data Provider" invariant="System.Data.OracleClient" description=".Net Framework Data Provider for Oracle" type="System.Data.OracleClient.OracleClientFactory, System.Data.OracleClient, Version=%ASSEMBLY_VERSION%, Culture=neutral, PublicKeyToken=%ECMA_PUBLICKEY%"/>
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// <add name="SqlClient Data Provider" invariant="System.Data.SqlClient" description=".Net Framework Data Provider for SqlServer" type="System.Data.SqlClient.SqlClientFactory, System.Data, Version=%ASSEMBLY_VERSION%, Culture=neutral, PublicKeyToken=%ECMA_PUBLICKEY%"/>
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Type sysDataType = typeof(System.Data.SqlClient.SqlClientFactory);
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string asmQualName = sysDataType.AssemblyQualifiedName.ToString().Replace(DbProviderFactoriesConfigurationHandler.sqlclientPartialAssemblyQualifiedName, DbProviderFactoriesConfigurationHandler.oracleclientPartialAssemblyQualifiedName);
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DbProviderFactoryConfigSection[] dbFactoriesConfigSection = new DbProviderFactoryConfigSection[(int)DbProvidersIndex.DbProvidersIndexCount];
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dbFactoriesConfigSection[(int)DbProvidersIndex.Odbc] = new DbProviderFactoryConfigSection(typeof(System.Data.Odbc.OdbcFactory), DbProviderFactoriesConfigurationHandler.odbcProviderName, DbProviderFactoriesConfigurationHandler.odbcProviderDescription);
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dbFactoriesConfigSection[(int)DbProvidersIndex.OleDb] = new DbProviderFactoryConfigSection(typeof(System.Data.OleDb.OleDbFactory), DbProviderFactoriesConfigurationHandler.oledbProviderName, DbProviderFactoriesConfigurationHandler.oledbProviderDescription);
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dbFactoriesConfigSection[(int)DbProvidersIndex.OracleClient] = new DbProviderFactoryConfigSection(DbProviderFactoriesConfigurationHandler.oracleclientProviderName, DbProviderFactoriesConfigurationHandler.oracleclientProviderNamespace, DbProviderFactoriesConfigurationHandler.oracleclientProviderDescription, asmQualName);
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dbFactoriesConfigSection[(int)DbProvidersIndex.SqlClient] = new DbProviderFactoryConfigSection(typeof(System.Data.SqlClient.SqlClientFactory), DbProviderFactoriesConfigurationHandler.sqlclientProviderName, DbProviderFactoriesConfigurationHandler.sqlclientProviderDescription);
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for (int i = 0; i < dbFactoriesConfigSection.Length; i++)
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{
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if (dbFactoriesConfigSection[i].IsNull() == false)
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{
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bool flagIncludeToTable = false;
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if (i == ((int)DbProvidersIndex.OracleClient)) // OracleClient Provider: Include only if it installed
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{
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Type providerType = Type.GetType(dbFactoriesConfigSection[i].AssemblyQualifiedName);
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if (providerType != null)
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{
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// NOTES: Try and create a instance; If it fails, it will throw a System.NullReferenceException exception;
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System.Reflection.FieldInfo providerInstance = providerType.GetField(Instance, System.Reflection.BindingFlags.DeclaredOnly | System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Static);
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if ((null != providerInstance) && (providerInstance.FieldType.IsSubclassOf(typeof(DbProviderFactory))))
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{
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Debug.Assert(providerInstance.IsPublic, "field not public");
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Debug.Assert(providerInstance.IsStatic, "field not static");
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object factory = providerInstance.GetValue(null);
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if (null != factory)
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{
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flagIncludeToTable = true;
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} // Else ignore and don't add to table
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} // Else ignore and don't add to table
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}
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}
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else
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{
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flagIncludeToTable = true;
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}
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if (flagIncludeToTable == true)
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{
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DataRow row = dataTable.NewRow();
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row[Name] = dbFactoriesConfigSection[i].Name;
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row[InvariantName] = dbFactoriesConfigSection[i].InvariantName;
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row[Description] = dbFactoriesConfigSection[i].Description;
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row[AssemblyQualifiedName] = dbFactoriesConfigSection[i].AssemblyQualifiedName;
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dataTable.Rows.Add(row);
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} // Else Ignore and do not include to table;
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}
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}
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// NOTES: Additional step added here to maintain the sequence order of the providers listed.
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// The Framework Providers get listed first and is followed the custom providers.
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for (int i = 0; (configDataTable != null) && (i < configDataTable.Rows.Count); i++)
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{
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try
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{
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bool flagIncludeToTable = false;
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// OracleClient Provider: Include only if it installed
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if (configDataTable.Rows[i][AssemblyQualifiedName].ToString().ToLowerInvariant().Contains(DbProviderFactoriesConfigurationHandler.oracleclientProviderNamespace.ToString().ToLowerInvariant()))
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{
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Type providerType = Type.GetType(configDataTable.Rows[i][AssemblyQualifiedName].ToString());
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if (providerType != null)
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{
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// NOTES: Try and create a instance; If it fails, it will throw a System.NullReferenceException exception;
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System.Reflection.FieldInfo providerInstance = providerType.GetField(Instance, System.Reflection.BindingFlags.DeclaredOnly | System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Static);
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if ((null != providerInstance) && (providerInstance.FieldType.IsSubclassOf(typeof(DbProviderFactory))))
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{
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Debug.Assert(providerInstance.IsPublic, "field not public");
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Debug.Assert(providerInstance.IsStatic, "field not static");
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object factory = providerInstance.GetValue(null);
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if (null != factory)
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{
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flagIncludeToTable = true;
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} // Else ignore and don't add to table
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} // Else ignore and don't add to table
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}
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}
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else
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{
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flagIncludeToTable = true;
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}
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if(flagIncludeToTable == true)
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{
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// NOTES: If it already exist in the configTable, it raises a ConstraintException;
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dataTable.Rows.Add(configDataTable.Rows[i].ItemArray);
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}
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}
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catch (System.Data.ConstraintException)
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{
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// NOTES: Ignore item; Already exist in the configTable, hence the ConstraintException; Move to the next item;
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}
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}
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return dataTable;
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}
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static private DataTable GetProviderTable() {
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Initialize();
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return _providerTable;
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}
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static private void Initialize() {
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if (ConnectionState.Open != _initState) {
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lock (_lockobj) {
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switch(_initState) {
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case ConnectionState.Closed:
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_initState = ConnectionState.Connecting; // used for preventing recursion
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try {
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DataSet configTable = PrivilegedConfigurationManager.GetSection(DbProviderFactoriesConfigurationHandler.sectionName) as DataSet;
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_providerTable = (null != configTable) ? IncludeFrameworkFactoryClasses(configTable.Tables[DbProviderFactoriesConfigurationHandler.providerGroup]) : IncludeFrameworkFactoryClasses(null);
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}
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finally {
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_initState = ConnectionState.Open;
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}
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break;
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case ConnectionState.Connecting:
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case ConnectionState.Open:
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break;
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default:
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Debug.Assert(false, "unexpected state");
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break;
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}
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}
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}
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}
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}
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}
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