Home > Database > Mysql Tutorial > 树状结构表中,获取指定节点的所有父节点路径

树状结构表中,获取指定节点的所有父节点路径

WBOY
Release: 2016-06-07 14:55:08
Original
1312 people have browsed it

树状结构表中,获取指定节点的所有父节点路径,为了方便查看,我增加了节点的id。 无 drop table if exists `group`;create table `group` (`id` int(11) not null auto_increment,`parent_group_id` int(11) not null default '-1',`name` varchar(255) not

树状结构表中,获取指定节点的所有父节点路径,为了方便查看,我增加了节点的id。
Copy after login
drop table if exists `group`;

create table `group` (
	`id` int(11) not null auto_increment,
	`parent_group_id` int(11) not null default '-1',
	`name` varchar(255) not null,
	primary key (`id`)
);

insert into `group` (`id`, `name`, `parent_group_id`) values (1, 'a', -1);
insert into `group` (`id`, `name`, `parent_group_id`) values (2, 'b', -1);
insert into `group` (`id`, `name`, `parent_group_id`) values (3, 'c',  1);


/**
 * 返回树状结构表中指定节点的父节点路径.
 * 张露兵 zhanglubing927@163.com
 * 2012-2-21
 */
drop procedure if exists get_path;

delimiter $
create procedure get_path(in id int) 
begin

	declare gid int default id; 
	declare path varchar(255) default '';
	
	while gid is not null and gid != -1 do
		select concat(concat(g.name,'(', g.id, ')'), '-', path), g.parent_group_id into path, gid 
		from `group` g where g.id = gid;
	end while;
	
	select substring(path, 1, length(path)-1) 'path'; 
end
$

-- call get_path(3);
-- a(1)-c(3)
Copy after login
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template