code: @Override
  	public boolean execute(final LineReader reader, final String[] parts, final SqlConfig sqlConfig,
  			final Properties props) {
  		PrintWriter writer = reader.getTerminal().writer();
  		writer.println("DRIVER:");
  		writer.flush();
  
  		Enumeration<Driver> drivers = DriverManager.getDrivers();
  		int driverCount = 0;
  		while (drivers.hasMoreElements()) {
  			Driver driver = drivers.nextElement();
  			writer.println(String.format("%02d : %s%n", ++driverCount, driver));
  		}
  
  		writer.flush();
  		return true;
  	}
docs: {@inheritDoc}
  
  @see jp.co.future.uroborosql.client.command.ReplCommand#execute(org.jline.reader.LineReader, java.lang.String[], jp.co.future.uroborosql.config.SqlConfig, java.util.Properties)