递归查询节点,从别处复制来的,只因太好
SQL 递归查询示例:
create table #EnterPrise
(
Department nvarchar(50),--部门名称
ParentDept nvarchar(50),--上级部门
DepartManage nvarchar(30)--部门经理
)
insert into #EnterPrise select '技术部','总经办','Tom'
insert into #EnterPrise select '商务部','总经办','Jeffry'
insert into #EnterPrise select '商务一部','商务部','ViVi'
insert into #EnterPrise select '商务二部','商务部','Peter'
insert into #EnterPrise select '程序组','技术部','GiGi'
insert into #EnterPrise select '设计组','技术部','yoyo'
insert into #EnterPrise select '专项组','程序组','Yue'
insert into #EnterPrise select '总经办','','Boss'
--查询部门经理是Tom的下面的部门名称
;with hgo as
(
select *,0 as rank from #EnterPrise where DepartManage='Tom'
union all
select h.*,h1.rank+1 from #EnterPrise h join hgo h1 on h.ParentDept=h1.Department
)
select * from hgo
/*
Department ParentDept DepartManage rank
--------------- -------------------- ----------------------- -----------
技术部 总经办 Tom 0
程序组 技术部 GiGi 1
设计组 技术部 yoyo 1
专项组 程序组 Yue 2
*/
--查询部门经理是GiGi的上级部门名称
;with hgo as
(
select *,0 as rank from #EnterPrise where DepartManage='GiGi'
union all
select h.*,h1.rank+1 from #EnterPrise h join hgo h1 on h.Department=h1.ParentDept
)
select * from hgo
/*
Department ParentDept DepartManage rank
-------------------- ---------------------- ----------- -----------
程序组 技术部 GiGi 0
技术部 总经办 Tom 1
总经办 Boss 2
*/
--===========================================================================================================
create table #tt
(id int,
parentid int,
name varchar(20))
insert #tt
select 1,0,'上海市'union all
select 2,1,'虹口区'union all
select 3,1,'徐汇区'union all
select 4,1,'浦东新区'union all
select 5,2,'江湾镇'union all
select 6,2,'虹口足球场'union all
select 7,5,'吉买盛'union all
select 8,5,'易卜莲花'union all
select 9,5,'农工商'union all
select 10,6,'吉买盛'
with cte as(
select *,0 as levl from #tt where id=2
union all
select a.*,b.levl+1 from #tt a,cte b where a.parentid=b.id
)
select * from cte where levl>0
-- id parentid name levl
----------- ----------- -------------------- -----------
5 2 江湾镇 1
6 2 虹口足球场 1
10 6 吉买盛 2
7 5 吉买盛 2
8 5 易卜莲花 2
9 5 农工商 2
==============================================================================================
if not object_id('Tab') is null
drop table Tab
Go
Create table Tab([Id] int,[ParentId] int,[Name] nvarchar(50))
Insert Tab
select 1,0,N'上海市' union all
select 2,1,N'虹口区' union all
select 3,1,N'徐汇区' union all
select 4,1,N'浦东新区' union all
select 5,2,N'江湾镇' union all
select 6,2,N'虹口足球场' union all
select 7,5,N'吉买盛' union all
select 8,5,N'易卜莲花' union all
select 9,5,N'农工商' union all
select 10,6,N'吉买盛'
Go
IF OBJECT_ID('P_GetParentId') is not null drop proc P_GetParentId
go
Create proc P_GetParentId
(
@ParentId int
)
as
begin
declare @Del table(ID int,[ParentId] int)
insert @Del select ID,[ParentId] from Tab a where exists(select 1 from Tab where a.Id = 2)
while @@rowcount>0
begin
insert @Del
select a.ID,a.[ParentId]
from Tab a
inner join @Del b on b.ID=a.[ParentId]
where not exists(select 1 from @Del where ID=a.ID)
end
select * from @Del
end
gO
--TEST
EXEC P_GetParentId 2
--结果
--
/*
ID ParentId
----------- -----------
2 1
5 2
6 2
7 5
8 5
9 5
10 6
*/
--============================================================================================
--SQL code
/*
标题:SQL SERVER 2000中查询指定节点及其所有子节点的函数(表格形式显示)
作者:爱新觉罗·毓华(十八年风雨,守得冰山雪莲花开)
时间:2008-05-12
地点:广东深圳
*/
create table tb(id varchar(3) , pid varchar(3) , name varchar(10))
insert into tb values('001' , null , '广东省')
insert into tb values('002' , '001' , '广州市')
insert into tb values('003' , '001' , '深圳市')
insert into tb values('004' , '002' , '天河区')
insert into tb values('005' , '003' , '罗湖区')
insert into tb values('006' , '003' , '福田区')
insert into tb values('007' , '003' , '宝安区')
insert into tb values('008' , '007' , '西乡镇')
insert into tb values('009' , '007' , '龙华镇')
insert into tb values('010' , '007' , '松岗镇')
go
--查询指定节点及其所有子节点的函数
create function f_cid(@ID varchar(3)) returns @t_level table(id varchar(3) , level int)
as
begin
declare @level int
set @level = 1
insert into @t_level select @id , @level
while @@ROWCOUNT > 0
begin
set @level = @level + 1
insert into @t_level select a.id , @level
from tb a , @t_Level b
where a.pid = b.id and b.level = @level - 1
end
return
end
go
--调用函数查询001(广东省)及其所有子节点
select a.* from tb a , f_cid('001') b where a.id = b.id order by a.id
/*
id pid name
---- ---- ----------
001 NULL 广东省
002 001 广州市
003 001 深圳市
004 002 天河区
005 003 罗湖区
006 003 福田区
007 003 宝安区
008 007 西乡镇
009 007 龙华镇
010 007 松岗镇
(所影响的行数为 10 行)
*/
--调用函数查询002(广州市)及其所有子节点
select a.* from tb a , f_cid('002') b where a.id = b.id order by a.id
/*
id pid name
---- ---- ----------
002 001 广州市
004 002 天河区
(所影响的行数为 2 行)
*/
--调用函数查询003(深圳市)及其所有子节点
select a.* from tb a , f_cid('003') b where a.id = b.id order by a.id
/*
id pid name
---- ---- ----------
003 001 深圳市
005 003 罗湖区
006 003 福田区
007 003 宝安区
008 007 西乡镇
009 007 龙华镇
010 007 松岗镇
(所影响的行数为 7 行)
*/
drop table tb
drop function f_cid
/*
SQL code
@@ROWCOUNT:返回受上一语句影响的行数。
返回类型:integer。
注释:任何不返回行的语句将这一变量设置为 0 ,如 IF 语句。
示例:下面的示例执行 UPDATE 语句并用 @@ROWCOUNT 来检测是否有发生更改的行。
*/
UPDATE authors SET au_lname = 'Jones' WHERE au_id = '999-888-7777'
IF @@ROWCOUNT = 0
print 'Warning: No rows were updated'
/*
结果:
(所影响的行数为 0 行)
Warning: No rows were updated
SQL code
*/
/*
标题:SQL SERVER 2005中查询指定节点及其所有子节点的函数(表格形式显示)
作者:爱新觉罗·毓华(十八年风雨,守得冰山雪莲花开)
时间:2010-02-02
地点:新疆乌鲁木齐
*/
create table tb(id varchar(3) , pid varchar(3) , name nvarchar(10))
insert into tb values('001' , null , N'广东省')
insert into tb values('002' , '001' , N'广州市')
insert into tb values('003' , '001' , N'深圳市')
insert into tb values('004' , '002' , N'天河区')
insert into tb values('005' , '003' , N'罗湖区')
insert into tb values('006' , '003' , N'福田区')
insert into tb values('007' , '003' , N'宝安区')
insert into tb values('008' , '007' , N'西乡镇')
insert into tb values('009' , '007' , N'龙华镇')
insert into tb values('010' , '007' , N'松岗镇')
go
DECLARE @ID VARCHAR(3)
--查询ID = '001'的所有子节点
SET @ID = '001'
;WITH T AS
(
SELECT ID , PID , NAME
FROM TB
WHERE ID = @ID
UNION ALL
SELECT A.ID , A.PID , A.NAME
FROM TB AS A JOIN T AS B ON A.PID = B.ID
)
SELECT * FROM T ORDER BY ID
/*
ID PID NAME
---- ---- ----------
001 NULL 广东省
002 001 广州市
003 001 深圳市
004 002 天河区
005 003 罗湖区
006 003 福田区
007 003 宝安区
008 007 西乡镇
009 007 龙华镇
010 007 松岗镇
(10 行受影响)
*/
--查询ID = '002'的所有子节点
SET @ID = '002'
;WITH T AS
(
SELECT ID , PID , NAME
FROM TB
WHERE ID = @ID
UNION ALL
SELECT A.ID , A.PID , A.NAME
FROM TB AS A JOIN T AS B ON A.PID = B.ID
)
SELECT * FROM T ORDER BY ID
/*
ID PID NAME
---- ---- ----------
002 001 广州市
004 002 天河区
(2 行受影响)
*/
--查询ID = '003'的所有子节点
SET @ID = '003'
;WITH T AS
(
SELECT ID , PID , NAME
FROM TB
WHERE ID = @ID
UNION ALL
SELECT A.ID , A.PID , A.NAME
FROM TB AS A JOIN T AS B ON A.PID = B.ID
)
SELECT * FROM T ORDER BY ID
/*
ID PID NAME
---- ---- ----------
003 001 深圳市
005 003 罗湖区
006 003 福田区
007 003 宝安区
008 007 西乡镇
009 007 龙华镇
010 007 松岗镇
(7 行受影响)
*/
drop table tb
--注:除ID值不一样外,三个SQL语句是一样的。
--===============================================================================
declare @t table(id int identity(1,1),parentid int,name varchar(10))
insert @t(parentid,name) select 0,'上海市'
union all select 1,'虹口区'
union all select 1,'徐汇区'
union all select 1,'浦东新区'
union all select 2,'江湾镇'
union all select 2,'虹口足球场'
union all select 5,'吉买盛'
union all select 5,'易卜莲花'
union all select 5,'农工商'
union all select 6,'吉买盛'
select * from @t
;with tb as
(
select * from @t
where id=2
union all
select a.* from @t a join tb b on a.parentid=b.id
)
select * from tb
order by id
/*
(10 行受影响)
id parentid name
----------- ----------- ----------
1 0 上海市
2 1 虹口区
3 1 徐汇区
4 1 浦东新区
5 2 江湾镇
6 2 虹口足球场
7 5 吉买盛
8 5 易卜莲花
9 5 农工商
10 6 吉买盛
(10 行受影响)
id parentid name
----------- ----------- ----------
2 1 虹口区
5 2 江湾镇
6 2 虹口足球场
7 5 吉买盛
8 5 易卜莲花
9 5 农工商
10 6 吉买盛
(7 行受影响)
*/
--============================================================================
drop table tb
go
create table tb(code int,su_code int)
insert into tb(code,su_code) values(1,null)
insert into tb(code,su_code) values(11,1)
insert into tb(code,su_code) values(12,1)
insert into tb(code,su_code) values(111,11)
insert into tb(code,su_code) values(112,11)
insert into tb(code,su_code) values(121,12)
insert into tb(code,su_code) values(122,12)
insert into tb(code,su_code) values(1221,122)
go
create table #stack(item int,levels int)
delete from #stack
set nocount on
go
declare @top int
declare @level int
declare @line varchar(128)
select @top=code from tb where su_code is null
insert into #stack values(@top,1)
select @level=1
while @level> 0
begin
if exists(select * from #stack where levels=@level)
begin
select @top=item from #stack where levels=@level
select @line=space(@level-1)+convert(varchar,@top)
print @line
delete from #stack where levels=@level and item=@top
insert into #stack select code,@level+1 from tb where su_code=@top
if @@rowcount> 0
select @level=@level+1
end
else
select @level=@level-1
end
--===============================================================================
--函数
-->Title:Generating test data
-->Author:wufeng4552
-->Date :2009-09-30 08:52:38
set nocount on
if object_id('tb','U')is not null drop table tb
go
create table tb(ID int, ParentID int)
insert into tb select 1,0
insert into tb select 2,1
insert into tb select 3,1
insert into tb select 4,2
insert into tb select 5,3
insert into tb select 6,5
insert into tb select 7,6
-->Title:查找指定節點下的子結點
if object_id('Uf_GetChildID')is not null drop function Uf_GetChildID
go
create function Uf_GetChildID(@ParentID int)
returns @t table(ID int)
as
begin
insert @t select ID from tb where ParentID=@ParentID
while @@rowcount<>0
begin
insert @t select a.ID from tb a inner join @t b
on a.ParentID=b.id and
not exists(select 1 from @t where id=a.id)
end
return
end
go
select * from dbo.Uf_GetChildID(5)
/*
ID
-----------
6
7
*/
-->Title:查找指定節點的所有父結點
if object_id('Uf_GetParentID')is not null drop function Uf_GetParentID
go
create function Uf_GetParentID(@ID int)
returns @t table(ParentID int)
as
begin
insert @t select ParentID from tb where ID=@ID
while @@rowcount!=0
begin
insert @t select a.ParentID from tb a inner join @t b
on a.id=b.ParentID and
not exists(select 1 from @t where ParentID=a.ParentID)
end
return
end
go
select * from dbo.Uf_GetParentID(2)
/*
ParentID
-----------
1
0
*/
--==========================================================================================
--测试数据
DECLARE @t TABLE(ID char(3),PID char(3),Name nvarchar(10))
INSERT @t SELECT '001',NULL ,'山东省'
UNION ALL SELECT '002','001','烟台市'
UNION ALL SELECT '004','002','招远市'
UNION ALL SELECT '003','001','青岛市'
UNION ALL SELECT '005',NULL ,'四会市'
UNION ALL SELECT '006','005','清远市'
UNION ALL SELECT '007','006','小分市'
--深度排序显示处理
--生成每个节点的编码累计(相同当单编号法的编码)
DECLARE @t_Level TABLE(ID char(3),Level int,Sort varchar(8000))
DECLARE @Level int
SET @Level=0
INSERT @t_Level SELECT ID,@Level,ID
FROM @t
WHERE PID IS NULL
WHILE @@ROWCOUNT>0
BEGIN
SET @Level=@Level+1
INSERT @t_Level SELECT a.ID,@Level,b.Sort+a.ID
FROM @t a,@t_Level b
WHERE a.PID=b.ID
AND b.Level=@Level-1
END
--显示结果
SELECT SPACE(b.Level*2)+'|--'+a.Name
FROM @t a,@t_Level b
WHERE a.ID=b.ID
ORDER BY b.Sort
/*--结果
|--山东省
|--烟台市
|--招远市
|--青岛市
|--四会市
|--清远市
|--小分市
--*/
说明:以上内容均为从其他帖子汇总而来。