标签:io ar cti sp ad on sql type
在SQL的树型结构中,很多时候,知道某一节点的值,需要查找该节点的所有子节点(包括多级)的功能,这时就需要用到如下的用户自定义函数.
表结构如下:
ID | int |
Dep_Type | int |
Dep_Code | varchar(50) |
Dep_Name | varchar(50) |
Dep_Dian | int |
Dep_FathID | int |
Dep_Opera | varchar(50) |
Dep_Status | int |
Dep_AddTime | datetime |
用户自定义函数如下:
create function f_getChild(@ID VARCHAR(10))
returns @t table(ID VARCHAR(10),PID VARCHAR(10),Level INT)
as
begin
declare @i int,@ret varchar(8000)
set @i = 1
insert into @t select ID,Dep_FathID,@i from H_Dep_Info where Dep_FathID = @ID
while @@rowcount<>0
begin
set @i = @i + 1
insert into @t select a.ID,a.Dep_FathID,@i from H_Dep_Info a,@t b where a.Dep_FathID=b.ID and b.Level = @i-1
end
return
end
执行操作如下:
select ID from f_getChild(1)
返回值就是所有的子节点
查找父节点的函数如下:
CREATE FUNCTION [f_getParent](@id int)
RETURNS @re TABLE(id int,pid int,level int)
AS
begin
declare @level int
set @level = 1
declare @pid int
select @pid = pid from tb where id = @id
insert @re
select id,pid,@level from tb where id = @pid
while @@rowcount > 0
begin
set @level = @level + 1
select @pid = pid from tb where id = @pid
insert @re
select id,pid,@level from tb where id = @pid
end
return
end
执行操作如下:
select * from f_getParent(8)
返回的列有id,pid,level
其中id就是8的父节点,pid就是id的父节点,level就是级数(表示这个id是8的第几级你节点)
SQL 递归找查所有子节点及所有父节,布布扣,bubuko.com
标签:io ar cti sp ad on sql type
原文地址:http://www.cnblogs.com/andycai/p/3928969.html