1、 OracleTransaction类的概述（from msdn ）

   try
   {
     myCommand.CommandText = "INSERT INTO Dept (DeptNo, Dname, Loc) values (50, 'TECHNOLOGY', 'DENVER')";
     myCommand.ExecuteNonQuery();
     myCommand.CommandText = "INSERT INTO Dept (DeptNo, Dname, Loc) values (60, 'ENGINEERING', 'KANSAS CITY')";
     myCommand.ExecuteNonQuery();
     myTrans.Commit();
     Console.WriteLine("Both records are written to database.");
   }
   catch(Exception e)
   {
     myTrans.Rollback();
     Console.WriteLine(e.ToString());
     Console.WriteLine("Neither record was written to database.");
   }
   finally
   {
     myConnection.Close();
   }
}