--菜单目录结构表
create table #tb_menu(
id int not null, --主键id
title varchar(50), --标题
parentid int --parentid id
);
--父菜单
insert into #tb_menu(id, title, parentid) values(1, '父菜单1',null);
insert into #tb_menu(id, title, parentid) values(2, '父菜单2',null);
insert into #tb_menu(id, title, parentid) values(3, '父菜单3',null);
insert into #tb_menu(id, title, parentid) values(4, '父菜单4',null);
insert into #tb_menu(id, title, parentid) values(5, '父菜单5',null);
--一级菜单
insert into #tb_menu(id, title, parentid) values(6, '一级菜单6',1);
insert into #tb_menu(id, title, parentid) values(7, '一级菜单7',1);
insert into #tb_menu(id, title, parentid) values(8, '一级菜单8',1);
insert into #tb_menu(id, title, parentid) values(9, '一级菜单9',2);
insert into #tb_menu(id, title, parentid) values(10, '一级菜单10',2);
insert into #tb_menu(id, title, parentid) values(11, '一级菜单11',2);
insert into #tb_menu(id, title, parentid) values(12, '一级菜单12',3);
insert into #tb_menu(id, title, parentid) values(13, '一级菜单13',3);
insert into #tb_menu(id, title, parentid) values(14, '一级菜单14',3);
insert into #tb_menu(id, title, parentid) values(15, '一级菜单15',4);
insert into #tb_menu(id, title, parentid) values(16, '一级菜单16',4);
insert into #tb_menu(id, title, parentid) values(17, '一级菜单17',4);
insert into #tb_menu(id, title, parentid) values(18, '一级菜单18',5);
insert into #tb_menu(id, title, parentid) values(19, '一级菜单19',5);
insert into #tb_menu(id, title, parentid) values(20, '一级菜单20',5);
--二级菜单
insert into #tb_menu(id, title, parentid) values(21, '二级菜单21',6);
insert into #tb_menu(id, title, parentid) values(22, '二级菜单22',6);
insert into #tb_menu(id, title, parentid) values(23, '二级菜单23',7);
insert into #tb_menu(id, title, parentid) values(24, '二级菜单24',7);
insert into #tb_menu(id, title, parentid) values(25, '二级菜单25',8);
insert into #tb_menu(id, title, parentid) values(26, '二级菜单26',9);
insert into #tb_menu(id, title, parentid) values(27, '二级菜单27',10);
insert into #tb_menu(id, title, parentid) values(28, '二级菜单28',11);
insert into #tb_menu(id, title, parentid) values(29, '二级菜单29',12);
insert into #tb_menu(id, title, parentid) values(30, '二级菜单30',13);
insert into #tb_menu(id, title, parentid) values(31, '二级菜单31',14);
insert into #tb_menu(id, title, parentid) values(32, '二级菜单32',15);
insert into #tb_menu(id, title, parentid) values(33, '二级菜单33',16);
insert into #tb_menu(id, title, parentid) values(34, '二级菜单34',17);
insert into #tb_menu(id, title, parentid) values(35, '二级菜单35',18);
insert into #tb_menu(id, title, parentid) values(36, '二级菜单36',19);
insert into #tb_menu(id, title, parentid) values(37, '二级菜单37',20);
--三级菜单
insert into #tb_menu(id, title, parentid) values(38, '三级菜单38',21);
insert into #tb_menu(id, title, parentid) values(39, '三级菜单39',22);
insert into #tb_menu(id, title, parentid) values(40, '三级菜单40',23);
insert into #tb_menu(id, title, parentid) values(41, '三级菜单41',24);
insert into #tb_menu(id, title, parentid) values(42, '三级菜单42',25);
insert into #tb_menu(id, title, parentid) values(43, '三级菜单43',26);
insert into #tb_menu(id, title, parentid) values(44, '三级菜单44',27);
insert into #tb_menu(id, title, parentid) values(45, '三级菜单45',28);
insert into #tb_menu(id, title, parentid) values(46, '三级菜单46',28);
insert into #tb_menu(id, title, parentid) values(47, '三级菜单47',29);
insert into #tb_menu(id, title, parentid) values(48, '三级菜单48',30);
insert into #tb_menu(id, title, parentid) values(49, '三级菜单49',31);
insert into #tb_menu(id, title, parentid) values(50, '三级菜单50',31);
--数据表需要有id和parentid
WITH cte
as
(
--起始条件
SELECT cast(row_number() over(order by id) as varchar(10)) cid,*,0 AS level FROM #tb_menu where
--ISNULL(parentid,0)=0 --没有父节点菜单
--and id=6 --查询该节点下所有节点
union ALL
--递归条件
select cast(cid+cast(row_number() over(order by a.id )as varchar(10)) as varchar(10)),a.*,cte.level+1 from #tb_menu a
inner join cte --执行递归
ON cte.id=ISNULL(a.parentid,0)
)
select * from cte order by cid
结果没有父节点菜单
查询某节点上级节点
WITH cte
as
(
--起始条件level设置最高是3级
SELECT cast(row_number() over(order by id) as varchar(10)) cid,*,3 AS level FROM #tb_menu
WHERE
id=44
union ALL
--递归条件注意level-1和on的条件互换
select cast(cid+cast(row_number() over(order by a.id )as varchar(10)) as varchar(10)),a.*,cte.level-1 from #tb_menu a
inner join cte
--ON cte.id=ISNULL(a.parentid,0)
ON cte.parentid=a.id
)
select * from cte order by level ASC --根据层级降序