OdbcTransaction.cs source code in C# .NET

                        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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OdbcTransaction.cs source code in C# .NET

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