Is it a recurring event?

I needed to know if the event had recurrence. I ignore if there is a function for that, but i did not find it. I implemented it this way:

function em_get_recurrence($post_id){
	global $wpdb;
	$matches = $wpdb->get_var("SELECT count(*) from wp_postmeta WHERE post_id=".$post_id." AND meta_key='_event_occurrence_date'");
	$recurrence = intval($matches) - 1;	
	return $recurrence;
}

It returns the times the event is repeated (if it returns 0, the the event happens only once)