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// Copyright (c) 2004-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
//
// MySQL Connector/NET is licensed under the terms of the GPLv2
// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most
// MySQL Connectors. There are special exceptions to the terms and
// conditions of the GPLv2 as it is applied to this software, see the
// FLOSS License Exception
// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published
// by the Free Software Foundation; version 2 of the License.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
using System;
using System.Data;
using System.Data.Common;
namespace MySql.Data.MySqlClient
{
/// <include file='docs/MySqlTransaction.xml' path='docs/Class/*'/>
public sealed class MySqlTransaction : DbTransaction
{
private IsolationLevel level;
private MySqlConnection conn;
private bool open;
internal MySqlTransaction(MySqlConnection c, IsolationLevel il)
{
conn = c;
level = il;
open = true;
}
#region Properties
/// <summary>
/// Gets the <see cref="MySqlConnection"/> object associated with the transaction, or a null reference (Nothing in Visual Basic) if the transaction is no longer valid.
/// </summary>
/// <value>The <see cref="MySqlConnection"/> object associated with this transaction.</value>
/// <remarks>
/// A single application may have multiple database connections, each
/// with zero or more transactions. This property enables you to
/// determine the connection object associated with a particular
/// transaction created by <see cref="MySqlConnection.BeginTransaction()"/>.
/// </remarks>
public new MySqlConnection Connection
{
get { return conn; }
}
/// <summary>
/// Specifies the <see cref="IsolationLevel"/> for this transaction.
/// </summary>
/// <value>
/// The <see cref="IsolationLevel"/> for this transaction. The default is <b>ReadCommitted</b>.
/// </value>
/// <remarks>
/// Parallel transactions are not supported. Therefore, the IsolationLevel
/// applies to the entire transaction.
/// </remarks>
public override IsolationLevel IsolationLevel
{
get { return level; }
}
protected override DbConnection DbConnection
{
get { return conn; }
}
#endregion
protected override void Dispose(bool disposing)
{
if ((conn != null && conn.State == ConnectionState.Open || conn.SoftClosed) && open)
Rollback();
base.Dispose(disposing);
}
/// <include file='docs/MySqlTransaction.xml' path='docs/Commit/*'/>
public override void Commit()
{
if (conn == null || (conn.State != ConnectionState.Open && !conn.SoftClosed))
throw new InvalidOperationException("Connection must be valid and open to commit transaction");
if (!open)
throw new InvalidOperationException("Transaction has already been committed or is not pending");
MySqlCommand cmd = new MySqlCommand("COMMIT", conn);
cmd.ExecuteNonQuery();
open = false;
}
/// <include file='docs/MySqlTransaction.xml' path='docs/Rollback/*'/>
public override void Rollback()
{
if (conn == null || (conn.State != ConnectionState.Open && !conn.SoftClosed))
throw new InvalidOperationException("Connection must be valid and open to rollback transaction");
if (!open)
throw new InvalidOperationException("Transaction has already been rolled back or is not pending");
MySqlCommand cmd = new MySqlCommand("ROLLBACK", conn);
cmd.ExecuteNonQuery();
open = false;
}
}
}
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