protected function _having($Sql)
{
// Figure out the concatenation operator.
$Concat = '';
if (count($this->_Havings) > 0) {
$Concat = ' ' . $this->_WhereConcat . ' ';
}
// Revert the concat back to 'and'.
$this->_WhereConcat = $this->_WhereConcatDefault;
$this->_Havings[] = $Concat . $Sql;
return $this;
}