code: function _readMyAddress( pfnCallback )
  {
  	_db.query
  	(
  		"SELECT address FROM my_addresses",
  		[],
  		arrRows =>
  		{
  			if ( 0 === arrRows.length )
  			{
  				return pfnCallback( "no addresses" );
  			}
  			if ( arrRows.length > 1 )
  			{
  				return pfnCallback( "more than 1 address" );
  			}
  
  			//	...
  			pfnCallback( null, arrRows[ 0 ].address );
  		}
  	);
  }
docs: //////////////////////////////////////////////////////////////////////////////  Private  
  read my address from database
  
  @param pfnCallback
  @private