trigger_error('<span class="debug_error">no filters defined</span> for prefix <b>'.$this->Prefix.'</b>, but <b>DrawFilterMenu</b> tag used', E_USER_WARNING);
if (!isset($this->Fields[$field]) && ($field != 'RAND()')) {
trigger_error('<span class="debug_error">Incorrect sorting</span> defined (field = <b>'.$field.'</b>; direction = <b>'.$direction.'</b>) in config for prefix <b>'.$this->Prefix.'</b>', E_USER_WARNING);
}
$this->OrderFields[] = Array($field, $direction);
}
/**
* Removes all order fields
*
* @access public
* @return void
*/
function ClearOrderFields()
{
$this->OrderFields = Array();
}
/**
* Returns ORDER BY Clause of the query
*
* The method builds order by clause by iterating {@link kDBList::OrderFields} array and concatenating it.