Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebControls / AccessDataSource.cs / 1 / AccessDataSource.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.WebControls { using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Data.Common; using System.Data.OleDb; using System.Diagnostics; using System.Drawing; using System.Drawing.Design; using System.IO; using System.Security.Permissions; using System.Text; using System.Web.Caching; using System.Web.UI; ////// Allows a user to create a declarative connection to an Access database in a .aspx page. /// [ Designer("System.Web.UI.Design.WebControls.AccessDataSourceDesigner, " + AssemblyRef.SystemDesign), ToolboxBitmap(typeof(AccessDataSource)), WebSysDescription(SR.AccessDataSource_Description), WebSysDisplayName(SR.AccessDataSource_DisplayName) ] [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] public class AccessDataSource : SqlDataSource { private const string OleDbProviderName = "System.Data.OleDb"; private FileDataSourceCache _cache; private string _connectionString; private string _dataFile; private string _physicalDataFile; ////// Creates a new instance of AccessDataSource. /// public AccessDataSource() : base() { } ////// Creates a new instance of AccessDataSource with a specified connection string and select command. /// public AccessDataSource(string dataFile, string selectCommand) : base() { if (String.IsNullOrEmpty(dataFile)) { throw new ArgumentNullException("dataFile"); } DataFile = dataFile; SelectCommand = selectCommand; } ////// Specifies the cache settings for this data source. For the cache to /// work, the DataSourceMode must be set to DataSet. /// internal override DataSourceCache Cache { get { if (_cache == null) { _cache = new FileDataSourceCache(); } return _cache; } } ////// Gets the connection string for the AccessDataSource. This property is auto-generated and cannot be set. /// [ Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), ] public override string ConnectionString { get { if (_connectionString == null) { _connectionString = CreateConnectionString(); } return _connectionString; } set { throw new InvalidOperationException(SR.GetString(SR.AccessDataSource_CannotSetConnectionString)); } } ////// The name of an Access database file. /// This property is not stored in ViewState. /// [ DefaultValue(""), Editor("System.Web.UI.Design.MdbDataFileEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor)), UrlProperty(), WebCategory("Data"), WebSysDescription(SR.AccessDataSource_DataFile), ] public string DataFile { get { return (_dataFile == null) ? String.Empty : _dataFile; } set { if (DataFile != value) { _dataFile = value; _connectionString = null; _physicalDataFile = null; RaiseDataSourceChangedEvent(EventArgs.Empty); } } } ////// Gets the file data source cache object. /// private FileDataSourceCache FileDataSourceCache { get { FileDataSourceCache fileCache = Cache as FileDataSourceCache; Debug.Assert(fileCache != null, "Cache object should be a FileDataSourceCache"); return fileCache; } } ////// Gets the Physical path of the data file. /// private string PhysicalDataFile { get { if (_physicalDataFile == null) { _physicalDataFile = GetPhysicalDataFilePath(); } return _physicalDataFile; } } ////// Gets/sets the ADO.net managed provider name. This property is restricted to the OLE DB provider and cannot be set. /// [ Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), ] public override string ProviderName { get { return OleDbProviderName; } set { throw new InvalidOperationException(SR.GetString(SR.AccessDataSource_CannotSetProvider, ID)); } } ////// A semi-colon delimited string indicating which databases to use for the dependency in the format "database1:table1;database2:table2". /// [ Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), ] public override string SqlCacheDependency { get { throw new NotSupportedException(SR.GetString(SR.AccessDataSource_SqlCacheDependencyNotSupported, ID)); } set { throw new NotSupportedException(SR.GetString(SR.AccessDataSource_SqlCacheDependencyNotSupported, ID)); } } private void AddCacheFileDependency() { FileDataSourceCache.FileDependencies.Clear(); string filename = PhysicalDataFile; if (filename.Length > 0) { FileDataSourceCache.FileDependencies.Add(filename); } } ////// Creates a connection string for an Access database connection. /// The JET provider is automatically used, and the filename, username, password, and /// share mode are are set. /// private string CreateConnectionString() { return "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=" + PhysicalDataFile; } ////// Creates a new AccessDataSourceView. /// protected override SqlDataSourceView CreateDataSourceView(string viewName) { return new AccessDataSourceView(this, viewName, Context); } protected override DbProviderFactory GetDbProviderFactory() { return OleDbFactory.Instance; } ////// Gets the appropriate mapped path for the DataFile. /// private string GetPhysicalDataFilePath() { string filename = DataFile; if (filename.Length == 0) { return null; } if (!System.Web.Util.UrlPath.IsAbsolutePhysicalPath(filename)) { // Root relative path if (DesignMode) { // This exception should never be thrown - the designer always maps paths // before using the runtime control. throw new NotSupportedException(SR.GetString(SR.AccessDataSource_DesignTimeRelativePathsNotSupported, ID)); } filename = Context.Request.MapPath(filename, AppRelativeTemplateSourceDirectory, true); } HttpRuntime.CheckFilePermission(filename, true); // We also need to check for path discovery permissions for the // file since the page developer will be able to see the physical // path in the ConnectionString property. if (!HttpRuntime.HasPathDiscoveryPermission(filename)) { throw new HttpException(SR.GetString(SR.AccessDataSource_NoPathDiscoveryPermission, HttpRuntime.GetSafePath(filename), ID)); } return filename; } ////// Saves data to the cache. /// internal override void SaveDataToCache(int startRowIndex, int maximumRows, object data, CacheDependency dependency) { AddCacheFileDependency(); base.SaveDataToCache(startRowIndex, maximumRows, data, dependency); } /*internal override void SaveTotalRowCountToCache(int totalRowCount) { AddCacheFileDependency(); base.SaveTotalRowCountToCache(totalRowCount); }*/ } }
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