SQL Query - full text - order by score.

[eluser]Unknown[/eluser]
I am moving my plain old php site to CI. How can I replicate this SQL within a CI query?

Code:

$sql = "SELECT *, MATCH(title,caption,locName,name,text,keywords) AGAINST ('%" . $q . "%' IN BOOLEAN MODE) AS score
  FROM `dartmoorArchive`.`mainArchive`
  WHERE MATCH(title,caption,locName,name,text,keywords) AGAINST ('%" . $q . "%' IN BOOLEAN MODE)
  ORDER BY score DESC