getting RS Eevents category name from Joomla database - php

Question

I'm trying to get the category details from the joomla database for RSEvents. Can anyone shed any light on why this isn't working:
function _getCategorySlug($value) {
// Get a db connection.
$db = JFactory::getDbo();
// Create a new query object.
$query = $db->getQuery(true);
// Select all articles for users who have a username which starts with 'a'.
// Order it by the created date.
// Note by putting 'a' as a second parameter will generate `#__content` AS `a`
$query
->select($db->quoteName(array('a.*', 'b.id', 'b.ide')))
->from($db->quoteName('#__categories', 'a'))
->join('INNER', $db->quoteName('#__rseventspro_taxonomy', 'b')
. ' ON (' . $db->quoteName('a.id') . ' = ' . $db->quoteName('b.id') . ')')
->where($db->quoteName('b.ide') . ' = '.$db->quote($value));
// Reset the query using our newly populated query object.
$db->setQuery($query);
// Load the results as a list of stdClass objects (see later for more options on retrieving data).
$results = $db->loadObjectList();
}

Answer 1

I think this may help you. Using the below function you can get the categories of a particular event.
public function getCategories($id) {
$db = JFactory::getDbo();
$query = $db->getQuery(true);
$query->clear()
->select($db->qn('id'))
->from($db->qn('#__rseventspro_taxonomy'))
->where($db->qn('type').' = '.$db->q('category'))
->where($db->qn('ide').' = '.$id);
$db->setQuery($query);
return $db->loadColumn();
}

Answer 2

Thanks! That was a great help and got me to where I need (with a little tweaking):
function getCategories($id) {
$db = JFactory::getDbo();
$query = $db->getQuery(true);
$query->clear()
->select($db->qn('id'))
->from($db->qn('#__rseventspro_taxonomy'))
->where($db->qn('type').' = '.$db->q('category'))
->where($db->qn('ide').' = '.$id);
$db->setQuery($query);
$categories = $db->loadColumn();
return implode("_", $categories);
}
Also, would be great to find out what was wrong with my original query to get category's alias from the #__categories table