typo3 query: ORDER BY RAND()

I needed a query that returns 5 random items. My solution:

//fetch 5 IDs from the mm table
$idArr = $GLOBALS['TYPO3_DB']->exec_SELECTgetRows( 'uid_local', 'tx_something_user_userarticles_article_mm','', '', 'RAND()', '5' );
$ids = array();
//save the IDs to $ids
foreach($idArr as $k => $v){
	$ids[] = $v['uid_local'];
//now for the real query
$query = $this->createQuery();
$constraints = array(
	$query->in('uid', $ids),
return $query->execute(); 

It works. But there may be better solutions.

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