Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Common / DBConnection.cs / 2 / DBConnection.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //[....] //----------------------------------------------------------------------------- namespace System.Data.Common { using System; using System.ComponentModel; using System.Data; #if WINFSInternalOnly internal #else public #endif abstract class DbConnection : Component, IDbConnection { // V1.2.3300 private StateChangeEventHandler _stateChangeEventHandler; protected DbConnection() : base() { } [ DefaultValue(""), RecommendedAsConfigurable(true), RefreshProperties(RefreshProperties.All), ResCategoryAttribute(Res.DataCategory_Data), ] abstract public string ConnectionString { get; set; } [ ResCategoryAttribute(Res.DataCategory_Data), ] virtual public int ConnectionTimeout { get { return ADP.DefaultConnectionTimeout; } } [ ResCategoryAttribute(Res.DataCategory_Data), ] abstract public string Database { get; } [ ResCategoryAttribute(Res.DataCategory_Data), ] abstract public string DataSource { // NOTE: if you plan on allowing the data source to be changed, you // should implement a ChangeDataSource method, in keeping with // the ChangeDatabase method paradigm. get; } ////// The associated provider factory for derived class. /// virtual protected DbProviderFactory DbProviderFactory { get { return null; } } internal DbProviderFactory ProviderFactory { get { return DbProviderFactory; } } [ Browsable(false), ] abstract public string ServerVersion { get; } [ Browsable(false), ResDescriptionAttribute(Res.DbConnection_State), ] abstract public ConnectionState State { get; } [ ResCategoryAttribute(Res.DataCategory_StateChange), ResDescriptionAttribute(Res.DbConnection_StateChange), ] virtual public event StateChangeEventHandler StateChange { add { _stateChangeEventHandler += value; } remove { _stateChangeEventHandler -= value; } } abstract protected DbTransaction BeginDbTransaction(IsolationLevel isolationLevel); public DbTransaction BeginTransaction() { return BeginDbTransaction(IsolationLevel.Unspecified); } public DbTransaction BeginTransaction(IsolationLevel isolationLevel) { return BeginDbTransaction(isolationLevel); } IDbTransaction IDbConnection.BeginTransaction() { return BeginDbTransaction(IsolationLevel.Unspecified); } IDbTransaction IDbConnection.BeginTransaction(IsolationLevel isolationLevel) { return BeginDbTransaction(isolationLevel); } abstract public void Close(); abstract public void ChangeDatabase(string databaseName); public DbCommand CreateCommand() { return CreateDbCommand(); } IDbCommand IDbConnection.CreateCommand() { return CreateDbCommand(); } abstract protected DbCommand CreateDbCommand(); virtual public void EnlistTransaction(System.Transactions.Transaction transaction) { // NOTE: This is virtual because not all providers may choose to support // distributed transactions. throw ADP.NotSupported(); } // these need to be here so that GetSchema is visible when programming to a dbConnection object. // they are overridden by the real implementations in DbConnectionBase virtual public DataTable GetSchema() { throw ADP.NotSupported(); } virtual public DataTable GetSchema(string collectionName) { throw ADP.NotSupported(); } virtual public DataTable GetSchema(string collectionName, string[] restrictionValues ) { throw ADP.NotSupported(); } protected virtual void OnStateChange(StateChangeEventArgs stateChange) { StateChangeEventHandler handler = _stateChangeEventHandler; if (null != handler) { handler(this, stateChange); } } abstract public void Open(); } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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