Sql server 获得某一部门下的所有子部门。根据子部门获得它的上级部门。

Sql server 获得某一部门下的所有子部门。根据部门获得它的上级部门。以为要用递归呢，原来不需要的，通过自定义函数里，使用个临时表就可以了。@@RowCount作用可真不小啊。

一、准备数据

--用户表

if object_id ('Users','u') is not null

drop table Users

create table Users

(

User_Id int identity(1,1) not null PRIMARY KEY,

User_Name varchar(20)

)

set IDENTITY_INSERT Users on

insert Users(User_Id,User_Name)

select 1,'User1' union all

select 2,'User2' union all

select 3,'User3' union all

select 4,'User4' union all

select 5,'User5' union all

select 6,'User6' union all

select 7,'User7' union all

select 8,'User8' union all

select 9,'User9' union all

select 10,'User10' union all

select 11,'User11'

set identity_insert Users off

--部门表

if object_id ('Dept','u') is not null

drop table Dept

create table Dept

(

Dept_Id int identity(1,1) not null PRIMARY KEY,

Dept_Name varchar(20),

ParentDept_Id int

)

set IDENTITY_INSERT Dept on

insert Dept(Dept_Id,Dept_Name,ParentDept_id)

select 1,'Dept1',0 union all

select 2,'Dept2',0union all

select 3,'Dept3',0 union all

select 4,'Dept1_1',1 union all

select 5,'Dept1_2',1 union all

select 6,'Dept3_1',3 union all

select 7,'Dept3_1_1',6 union all

select 8,'Dept3_1_2',6 union all

select 9,'Dept3_1_3',6

set identity_insert Dept off

--用户部门表

if object_id ('UserDept','u') is not null

drop table UserDept

create table UserDept

(

UserDept_Id int identity(1,1) not null PRIMARY KEY,

Dept_Id int,

User_Id int

)

set IDENTITY_INSERT UserDept on

insert UserDept(UserDept_Id,Dept_Id,User_Id)

select 1,2,1 union all

select 2,2,2union all

select 3,1,5 union all

select 4,3,3 union all

select 5,3,4 union all

select 6,9,11 union all

select 7,9,10 union all

select 8,9,8 union all

select 9,4,6 union all

select 10,7,7 union all

select 11,4,9

set identity_insert UserDept off

二、根据部门IP获得它下面的所有部门

if object_id('UF_GetChildDept','tf') is not null

drop function UF_GetChildDept

go

-- =============================================

-- Author: <Author,,Name> adandelion

-- Create date: <Create Date,,>2007-12-03

-- Description: <Description,,> 根据传入的部门ID，返回它下面的所有子部门。

-- =============================================

create function UF_GetChildDept( @DeptId int )

returns @tb table (id int)

as

begin

insert into @tb

select dept_id from dept where parentdept_id = @deptid

while @@Rowcount >0 --只要有下级节点就循环

begin

insert into @tb

select dept_id --取出刚刚插入的deptid,去部门表里找parentdept_id = deptid的记录。

from dept as a inner join @tb as b on a.parentdept_id = b.id and a.dept_id not in(select id from @tb)

end

return

end

go

select *

from dbo.UF_GetChildDept(7)

三、根据部门IP获得它的上级部门

if object_id('UF_GetParentDept','tf') is not null

drop function UF_GetParentDept

go

-- =============================================

-- Author: <Author,,Name> adandelion

-- Create date: <Create Date,,>2007-12-03

-- Description: <Description,,> 根据传入的部门ID，返回它的上级部门。

-- =============================================

create function UF_GetParentDept( @DeptId int )

returns @tb table (id int)

as

begin

insert into @tb

select parentdept_id from dept where dept_id = @deptid

while @@Rowcount >0 --

begin

insert into @tb

select parentdept_id --

from dept as a inner join @tb as b on a.dept_id = b.id and a.parentdept_id not in(select id from @tb)

end

return

end

go

select *

from dbo.UF_GetParentDept(7)