apewer-dotnet/Apewer.Source/Externals/MySql.Data-6.10.9/MySqlClient/MySqlTransaction.cs

#if MYSQL_6_10

// Copyright (c) 2004, 2016 Oracle and/or its affiliates. All rights reserved.
//
// 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 Externals.MySql.Data.MySqlClient
{
    internal sealed class MySqlTransaction : DbTransaction
    {
        private bool open;
        private bool disposed = false;

        internal MySqlTransaction(MySqlConnection c, IsolationLevel il)
        {
            Connection = c;
            IsolationLevel = il;
            open = true;
        }

        #region Destructor
        ~MySqlTransaction()
        {
            Dispose(false);
        }
        #endregion

        #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 object associated with the transaction, or a null reference (Nothing in Visual Basic) if the transaction is no longer valid.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; }

        /// <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; }

        protected override DbConnection DbConnection
        {
            get { return Connection; }
        }

        #endregion


        protected override void Dispose(bool disposing)
        {
            if (disposed) return;
            base.Dispose(disposing);
            if (disposing)
            {
                if ((Connection != null && Connection.State == ConnectionState.Open || Connection.SoftClosed) && open)
                    Rollback();
            }
            disposed = true;
        }

        public override void Commit()
        {
            if (Connection == null || (Connection.State != ConnectionState.Open && !Connection.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", Connection);
            cmd.ExecuteNonQuery();
            open = false;
        }

        public override void Rollback()
        {
            if (Connection == null || (Connection.State != ConnectionState.Open && !Connection.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", Connection);
            cmd.ExecuteNonQuery();
            open = false;
        }

    }
}

#endif