按分类查找:
全部()
{query:
name=favorite as f,category as c
where=f.user_id eq $user_id and f.cat_id eq c.id
fields=count(*) as num,c.name,c.id
group=cat_id
}
{set:$favoriteSum+=$item['num']}
{$item['name']}({$item['num']})
{/query}