/**
* Render ORDER clause
*
* @param string $sql SQL query
* @return string
*/
protected function _renderOrder($sql)
{
if ($this->_parts[self::ORDER]) {
$order = array();
foreach ($this->_parts[self::ORDER] as $term) {
if (is_array($term)) {
if (is_numeric($term[0]) && strval(intval($term[0])) == $term[0]) {
$order[] = (int) trim($term[0]) . ' ' . $term[1];
} else {
$order[] = $this->_adapter->quoteIdentifier($term[0], true) . ' ' . $term[1];
}
} else {
if (is_numeric($term) && strval(intval($term)) == $term) {
$order[] = (int) trim($term);
} else {
$order[] = $this->_adapter->quoteIdentifier($term, true);
}
}
}
$sql .= ' ' . self::SQL_ORDER_BY . ' ' . implode(', ', $order);
}
return $sql;
}
