我的模型里有这个方法

function get_users_details(){
        $this->db->select("a.*,sum('b.downloads') as downloads,COUNT('b.user_email') as uploads");
        $this->db->from('user a');
        $this->db->join('files b', 'a.email = b.user_email','inner');

        $query = $this->db->get();
        if($query->num_rows() > 0)
        {
            foreach ($query->result_array() as $row){
                $data[] = $row;
            }
        $query->free_result();
        return $data;
        }
        else{
            return false;
        }
    }

它只从一行返回值，而实际上它应该从多行返回值。