/**
* This function sets how a column will be sorted.
*
* @access public
* @param string $column the column to be sorted
* @param string $ordering the ordering token that signals whether the
* column will sorted either in ascending or
* descending order
* @param string $nulls the weight to be given to null values
* @return DB_SQL_Update_Proxy a reference to the current instance
*/
public function order_by($column, $ordering = 'ASC', $nulls = 'DEFAULT')
{
$this->builder->order_by($column, $ordering, $nulls);
return $this;
}
