Joomla Database - How to use LIMIT in getQuery?

Question

I want to build the below query using joomla inbuilt database class.

SELECT * 
FROM table_name
ORDER BY id DESC
LIMIT 1

This is the query I hav

Answer 1

Update: Just had to revisit this answer, and I can confirm, both the methods setLimit & order are working if used as below.

$query->order($db->qn($data->sort_column_name) . ' ' . $data->sort_column_order);
$query->setLimit($length,$start);

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OLD ANSWER

As of 08/Sept/14 The solutions from @Dasun or @escopecz arent working for me on J3.x

but this old trick is working for me which is nice,

  $query->order($db->qn('id') . ' DESC LIMIT 25');

And About your specific requirement of wishing to fetch only 1 row you could use :

  $rows = $db->loadObject();