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111 lines
4.4 KiB
111 lines
4.4 KiB
// Copyright (c) 2004-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License version 2 as published by
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// the Free Software Foundation
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//
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// There are special exceptions to the terms and conditions of the GPL
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// as it is applied to this software. View the full text of the
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// exception in file EXCEPTIONS in the directory of this software
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// distribution.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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using System;
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using System.Data;
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using System.Data.Common;
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namespace MySql.Data.MySqlClient
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{
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/// <include file='docs/MySqlTransaction.xml' path='docs/Class/*'/>
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public sealed class MySqlTransaction : DbTransaction
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{
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private IsolationLevel level;
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private MySqlConnection conn;
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private bool open;
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internal MySqlTransaction(MySqlConnection c, IsolationLevel il)
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{
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conn = c;
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level = il;
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open = true;
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}
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#region Properties
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/// <summary>
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/// 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.
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/// </summary>
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/// <value>The <see cref="MySqlConnection"/> object associated with this transaction.</value>
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/// <remarks>
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/// A single application may have multiple database connections, each
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/// with zero or more transactions. This property enables you to
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/// determine the connection object associated with a particular
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/// transaction created by <see cref="MySqlConnection.BeginTransaction()"/>.
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/// </remarks>
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public new MySqlConnection Connection
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{
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get { return conn; }
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}
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/// <summary>
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/// Specifies the <see cref="IsolationLevel"/> for this transaction.
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/// </summary>
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/// <value>
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/// The <see cref="IsolationLevel"/> for this transaction. The default is <b>ReadCommitted</b>.
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/// </value>
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/// <remarks>
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/// Parallel transactions are not supported. Therefore, the IsolationLevel
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/// applies to the entire transaction.
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/// </remarks>
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public override IsolationLevel IsolationLevel
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{
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get { return level; }
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}
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protected override DbConnection DbConnection
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{
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get { return conn; }
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}
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#endregion
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protected override void Dispose(bool disposing)
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{
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if ((conn != null && conn.State == ConnectionState.Open || conn.SoftClosed) && open)
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Rollback();
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base.Dispose(disposing);
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}
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/// <include file='docs/MySqlTransaction.xml' path='docs/Commit/*'/>
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public override void Commit()
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{
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if (conn == null || (conn.State != ConnectionState.Open && !conn.SoftClosed))
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throw new InvalidOperationException("Connection must be valid and open to commit transaction");
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if (!open)
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throw new InvalidOperationException("Transaction has already been committed or is not pending");
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MySqlCommand cmd = new MySqlCommand("COMMIT", conn);
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cmd.ExecuteNonQuery();
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open = false;
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}
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/// <include file='docs/MySqlTransaction.xml' path='docs/Rollback/*'/>
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public override void Rollback()
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{
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if (conn == null || (conn.State != ConnectionState.Open && !conn.SoftClosed))
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throw new InvalidOperationException("Connection must be valid and open to rollback transaction");
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if (!open)
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throw new InvalidOperationException("Transaction has already been rolled back or is not pending");
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MySqlCommand cmd = new MySqlCommand("ROLLBACK", conn);
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cmd.ExecuteNonQuery();
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open = false;
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}
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}
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}
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