Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Data / System / Data / Odbc / OdbcTransaction.cs / 1305376 / OdbcTransaction.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //----------------------------------------------------------------------------- using System; using System.Data; using System.Data.Common; using System.Threading; namespace System.Data.Odbc { public sealed class OdbcTransaction : DbTransaction { private OdbcConnection _connection; private IsolationLevel _isolevel = IsolationLevel.Unspecified; private OdbcConnectionHandle _handle; internal OdbcTransaction(OdbcConnection connection, IsolationLevel isolevel, OdbcConnectionHandle handle) { OdbcConnection.VerifyExecutePermission(); _connection = connection; _isolevel = isolevel; _handle = handle; } new public OdbcConnection Connection { // MDAC 66655 get { return _connection; } } override protected DbConnection DbConnection { // MDAC 66655 get { return Connection; } } override public IsolationLevel IsolationLevel { get { OdbcConnection connection = _connection; if (null == connection ) { throw ADP.TransactionZombied(this); } //We need to query for the case where the user didn't set the isolevel //BeginTransaction(), but we should also query to see if the driver //"rolled" the level to a higher supported one... if(IsolationLevel.Unspecified == _isolevel) { //Get the isolation level int sql_iso= connection .GetConnectAttr(ODBC32.SQL_ATTR.TXN_ISOLATION, ODBC32.HANDLER.THROW); switch((ODBC32.SQL_TRANSACTION)sql_iso) { case ODBC32.SQL_TRANSACTION.READ_UNCOMMITTED: _isolevel = IsolationLevel.ReadUncommitted; break; case ODBC32.SQL_TRANSACTION.READ_COMMITTED: _isolevel = IsolationLevel.ReadCommitted; break; case ODBC32.SQL_TRANSACTION.REPEATABLE_READ: _isolevel = IsolationLevel.RepeatableRead; break; case ODBC32.SQL_TRANSACTION.SERIALIZABLE: _isolevel = IsolationLevel.Serializable; break; case ODBC32.SQL_TRANSACTION.SNAPSHOT: _isolevel = IsolationLevel.Snapshot; break; default: throw ODBC.NoMappingForSqlTransactionLevel(sql_iso); }; } return _isolevel; } } override public void Commit() { OdbcConnection.ExecutePermission.Demand(); // MDAC 81476 OdbcConnection connection = _connection; if (null == connection) { throw ADP.TransactionZombied(this); } connection.CheckState(ADP.CommitTransaction); // MDAC 68289 //Note: SQLEndTran success if not actually in a transaction, so we have to throw //since the IDbTransaciton spec indicates this is an error for the managed packages if(null == _handle) { throw ODBC.NotInTransaction(); } ODBC32.RetCode retcode = _handle.CompleteTransaction(ODBC32.SQL_COMMIT); if (retcode == ODBC32.RetCode.ERROR) { //If an error has occurred, we will throw an exception in HandleError, //and leave the transaction active for the user to retry connection.HandleError(_handle, retcode); } //Transaction is complete... connection.LocalTransaction = null; _connection = null; _handle = null; } protected override void Dispose(bool disposing) { if (disposing) { OdbcConnectionHandle handle = _handle; _handle = null; if (null != handle){ try{ ODBC32.RetCode retcode = handle.CompleteTransaction(ODBC32.SQL_ROLLBACK); if (retcode == ODBC32.RetCode.ERROR) { //don't throw an exception here, but trace it so it can be logged if (_connection != null) { Exception e = _connection.HandleErrorNoThrow(handle, retcode); ADP.TraceExceptionWithoutRethrow(e); } } } catch (Exception e){ // if (!ADP.IsCatchableExceptionType(e)) { throw; } } } if (_connection != null) { if (_connection.IsOpen) { _connection.LocalTransaction = null; } } _connection = null; _isolevel = IsolationLevel.Unspecified; } base.Dispose(disposing); } override public void Rollback() { OdbcConnection connection = _connection; if (null == connection) { throw ADP.TransactionZombied(this); } connection.CheckState(ADP.RollbackTransaction); // MDAC 68289 //Note: SQLEndTran success if not actually in a transaction, so we have to throw //since the IDbTransaciton spec indicates this is an error for the managed packages if(null == _handle) { throw ODBC.NotInTransaction(); } ODBC32.RetCode retcode = _handle.CompleteTransaction(ODBC32.SQL_ROLLBACK); if (retcode == ODBC32.RetCode.ERROR) { //If an error has occurred, we will throw an exception in HandleError, //and leave the transaction active for the user to retry connection.HandleError(_handle, retcode); } connection.LocalTransaction = null; _connection = null; _handle = null; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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