MySqlSession session;
String q = ".....";
if (!session.Connect(...))
	return;
Sql sql(session);
if (sql.Execute(q))
	while(sql.Fetch())
	{
		for (int i=0; i<sql.GetColumns(); ++i)
			ShowDBMessage(sql.GetColumnInfo(i).name + " : " + (String)sql[i]);
	}

sql.Execute(q);
while(sql.Fetch()) //<-- throws an exception if Execute() failed
{
	for (int i=0; i<sql.GetColumns(); ++i)
		ShowDBMessage(sql.GetColumnInfo(i).name + " : " + (String)sql[i]);
}