public RDBMSEngine(ConnectionSource source, SQLWriter writer, RDBMSProfiler profiler) { m_source = source; m_writer = writer; m_profiler = profiler;  m_writer.setEngine(this);
public RDBMSEngine(ConnectionSource source, SQLWriter writer) { this(source, writer, null);
    public RDBMSEngine(ConnectionSource source, SQLWriter writer,                       RDBMSProfiler profiler) {        m_source = source;        m_writer = writer;        m_profiler = profiler;        m_writer.setEngine(this);    }