290 lines
8.6 KiB
C#
290 lines
8.6 KiB
C#
//
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// System.Data.Odbc.OdbcTransaction
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//
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// Authors:
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// Brian Ritchie (brianlritchie@hotmail.com)
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//
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// Copyright (C) Brian Ritchie, 2002
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//
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// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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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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using System.Globalization;
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namespace System.Data.Odbc
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{
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#if NET_2_0
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public sealed class OdbcTransaction : DbTransaction, IDisposable
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#else
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public sealed class OdbcTransaction : MarshalByRefObject, IDbTransaction
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#endif
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{
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private bool disposed;
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private OdbcConnection connection;
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private IsolationLevel isolationlevel;
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private bool isOpen;
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internal OdbcTransaction (OdbcConnection conn, IsolationLevel isolationlevel)
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{
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// Set Auto-commit (102) to false
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SetAutoCommit (conn, false);
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// Handle isolation level
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OdbcIsolationLevel lev = OdbcIsolationLevel.ReadCommitted;
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OdbcConnectionAttribute attr = OdbcConnectionAttribute.TransactionIsolation;
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switch (isolationlevel) {
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case IsolationLevel.ReadUncommitted:
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lev = OdbcIsolationLevel.ReadUncommitted;
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break;
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case IsolationLevel.ReadCommitted:
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lev = OdbcIsolationLevel.ReadCommitted;
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break;
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case IsolationLevel.RepeatableRead:
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lev = OdbcIsolationLevel.RepeatableRead;
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break;
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case IsolationLevel.Serializable:
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lev = OdbcIsolationLevel.Serializable;
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break;
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#if NET_2_0
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case IsolationLevel.Snapshot:
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// badly broken on MS:
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// https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=305736
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lev = OdbcIsolationLevel.Snapshot;
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// SQL_ATTR_TXN_ISOLATION can be used to set all other isolation
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// levels except for SQL_TXN_SS_SNAPSHOT. If you want to use snapshot
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// isolation, you must set SQL_TXN_SS_SNAPSHOT through
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// SQL_COPT_SS_TXN_ISOLATION. However, you can retrieve the
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// isolation level by using either SQL_ATTR_TXN_ISOLATION or
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// SQL_COPT_SS_TXN_ISOLATION.
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// Source:
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// http://msdn2.microsoft.com/en-us/library/ms131709.aspx
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attr = OdbcConnectionAttribute.CoptTransactionIsolation;
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break;
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#endif
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case IsolationLevel.Unspecified:
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// when isolationlevel is not specified, then use
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// default isolation level of the driver and
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// lazy initialize it in the IsolationLevel property
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break;
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#if NET_2_0
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case IsolationLevel.Chaos:
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throw new ArgumentOutOfRangeException ("IsolationLevel",
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string.Format (CultureInfo.CurrentCulture,
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"The IsolationLevel enumeration " +
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"value, {0}, is not supported by " +
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"the .Net Framework Odbc Data " +
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"Provider.", (int) isolationlevel));
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#endif
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default:
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#if NET_2_0
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throw new ArgumentOutOfRangeException ("IsolationLevel",
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string.Format (CultureInfo.CurrentCulture,
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"The IsolationLevel enumeration value, {0}, is invalid.",
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(int) isolationlevel));
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#else
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throw new ArgumentException (string.Format (
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CultureInfo.InvariantCulture,
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"Not supported isolationlevel - {0}",
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isolationlevel));
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#endif
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}
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// only change isolation level if it was explictly set
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if (isolationlevel != IsolationLevel.Unspecified) {
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// mbd: Getting the return code of the second call to SQLSetConnectAttr is missing from original code!
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OdbcReturn ret = libodbc.SQLSetConnectAttr (conn.hDbc,
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attr, (IntPtr) lev, 0);
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if (ret != OdbcReturn.Success && ret != OdbcReturn.SuccessWithInfo)
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throw conn.CreateOdbcException (OdbcHandleType.Dbc, conn.hDbc);
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}
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this.isolationlevel = isolationlevel;
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connection = conn;
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isOpen = true;
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}
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// Set Auto-commit (102) connection attribute
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// [MonoTODO]: nice to have before svn: define libodbc.SQL_IS_UINTEGER = -5
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private static void SetAutoCommit (OdbcConnection conn, bool isAuto)
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{
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OdbcReturn ret = libodbc.SQLSetConnectAttr (conn.hDbc,
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OdbcConnectionAttribute.AutoCommit,
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(IntPtr) (isAuto ? 1 : 0), -5);
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if (ret != OdbcReturn.Success && ret != OdbcReturn.SuccessWithInfo)
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throw conn.CreateOdbcException (OdbcHandleType.Dbc, conn.hDbc);
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}
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private static IsolationLevel GetIsolationLevel (OdbcConnection conn)
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{
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int lev;
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int length;
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OdbcReturn ret = libodbc.SQLGetConnectAttr (conn.hDbc,
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OdbcConnectionAttribute.TransactionIsolation,
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out lev, 0, out length);
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if (ret != OdbcReturn.Success && ret != OdbcReturn.SuccessWithInfo)
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throw conn.CreateOdbcException (OdbcHandleType.Dbc, conn.hDbc);
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return MapOdbcIsolationLevel ((OdbcIsolationLevel) lev);
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}
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private static IsolationLevel MapOdbcIsolationLevel (OdbcIsolationLevel odbcLevel)
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{
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IsolationLevel isoLevel = IsolationLevel.Unspecified;
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switch (odbcLevel) {
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case OdbcIsolationLevel.ReadUncommitted:
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isoLevel = IsolationLevel.ReadUncommitted;
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break;
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case OdbcIsolationLevel.ReadCommitted:
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isoLevel = IsolationLevel.ReadCommitted;
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break;
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case OdbcIsolationLevel.RepeatableRead:
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isoLevel = IsolationLevel.RepeatableRead;
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break;
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case OdbcIsolationLevel.Serializable:
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isoLevel = IsolationLevel.Serializable;
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break;
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#if NET_2_0
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case OdbcIsolationLevel.Snapshot:
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isoLevel = IsolationLevel.Snapshot;
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break;
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#else
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default:
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throw new NotSupportedException (string.Format (
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CultureInfo.InvariantCulture,
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"Isolation level {0} is not supported.",
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odbcLevel));
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#endif
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}
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return isoLevel;
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}
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#region Implementation of IDisposable
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#if NET_2_0
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protected override
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#endif
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void Dispose (bool disposing)
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{
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if (!disposed) {
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if (disposing && isOpen)
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Rollback ();
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disposed = true;
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}
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}
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void IDisposable.Dispose ()
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{
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Dispose (true);
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GC.SuppressFinalize (this);
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}
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#endregion Implementation of IDisposable
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#region Implementation of IDbTransaction
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public
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#if NET_2_0
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override
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#endif //NET_2_0
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void Commit ()
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{
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if (!isOpen)
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throw ExceptionHelper.TransactionNotUsable (GetType ());
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if (connection.transaction == this) {
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OdbcReturn ret = libodbc.SQLEndTran ((short) OdbcHandleType.Dbc, connection.hDbc, 0);
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if (ret != OdbcReturn.Success && ret != OdbcReturn.SuccessWithInfo)
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throw connection.CreateOdbcException (OdbcHandleType.Dbc, connection.hDbc);
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SetAutoCommit (connection, true); // restore default auto-commit
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connection.transaction = null;
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connection = null;
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isOpen = false;
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} else
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throw new InvalidOperationException ();
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}
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public
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#if NET_2_0
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override
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#endif //NET_2_0
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void Rollback()
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{
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if (!isOpen)
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throw ExceptionHelper.TransactionNotUsable (GetType ());
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if (connection.transaction == this) {
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OdbcReturn ret = libodbc.SQLEndTran ((short) OdbcHandleType.Dbc, connection.hDbc, 1);
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if (ret != OdbcReturn.Success && ret != OdbcReturn.SuccessWithInfo)
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throw connection.CreateOdbcException (OdbcHandleType.Dbc, connection.hDbc);
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SetAutoCommit (connection, true); // restore default auto-commit
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connection.transaction = null;
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connection = null;
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isOpen = false;
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} else
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throw new InvalidOperationException ();
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}
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#if NET_2_0
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protected override DbConnection DbConnection {
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get {
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return Connection;
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}
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}
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#else
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IDbConnection IDbTransaction.Connection {
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get {
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return Connection;
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}
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}
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#endif
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public
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#if NET_2_0
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override
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#endif
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IsolationLevel IsolationLevel {
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get {
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if (!isOpen)
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throw ExceptionHelper.TransactionNotUsable (GetType ());
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if (isolationlevel == IsolationLevel.Unspecified)
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isolationlevel = GetIsolationLevel (Connection);
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return isolationlevel;
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}
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}
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#endregion Implementation of IDbTransaction
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#region Public Instance Properties
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public new OdbcConnection Connection {
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get {
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return connection;
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}
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}
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#endregion Public Instance Properties
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}
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}
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