php - 如何使用 join right 将简单查询写入 codeigniter 查询

Question

如何使用 join right 将简单查询写入 codeigniter 查询??????

$query = $this->db->query("Select staff_permissions_list.perm_type,staff_permissions_list.permission_key,staff_permissions_list.permission_label,
        staff_permissions_list.id, staff_role_permissions.permission_id as p_id,staff_role_permissions.role_id
                                FROM staff_role_permissions 
                                RIGHT JOIN staff_permissions_list ON staff_role_permissions.permission_id=staff_permissions_list.id 
                                AND staff_role_permissions.role_id=$id WHERE staff_permissions_list.perm_type=0
                                ORDER BY staff_permissions_list.id ASC
                                ");
                if ($query->num_rows() > 0) {
                    return $query->result_array();
                }

Answer 1

$this->db->select('book_id, book_name, author_name, category_name');
$this->db->from('books');
$this->db->join('category', 'category.category_id = books.category_id', 'right');
$query = $this->db->get();

可以使用这种右连接的方法获取数据