code: function queryBitsValueByCycleIndex( oConn, uCycleIndex, pfnCallback )
  {
  	if ( ! oConn )
  	{
  		return pfnCallback( `call queryBitsValueByCycleIndex with invalid oConn` );
  	}
  	if ( 'number' !== typeof uCycleIndex || uCycleIndex <= 0 )
  	{
  		return pfnCallback( `call queryBitsValueByCycleIndex with invalid uCycleIndex` );
  	}
  
  	oConn.query
  	(
  		"SELECT bits \
  		FROM round_cycle \
  		WHERE cycle_id = ?",
  		[
  			_round.getCycleIdByRoundIndex( uCycleIndex )
  		],
  		function( arrRows )
  		{
  			if ( 0 === arrRows.length )
  			{
  				return pfnCallback( `bits not found in table [round_cycle].` );
  			}
  
  			return pfnCallback( null, parseInt( arrRows[ 0 ][ 'bits' ] ) );
  		}
  	);
  }
docs: query bits value by round index from database
  
  @param	{handle}	oConn
  @param	{function}	oConn.query
  @param	{number}	uCycleIndex
  @param	{function}	pfnCallback( err, nBitsValue )