$result = Db::name("articles")
->alias('A')
->join('article_cate B', 'A.cate = B.id')
->where(["user_id"=>$this->user_id,"active"=>1])
->field("A.*, from_unixtime(create_time,'%Y-%m-%d %H:%i:%s') as create_time, B.cate_name")
->select();