唯一的区别就是排序是反向的就行了。 3、得到某个节点下面的所有节点,且按照树状结构返回我们用B做例子 1select*fromtreewherelft>2andright<11orderbylft 拿到的结果是 C,D,E,F,而且顺序也是正确的。 4、拿到所有下2级的子节点我们A做例子,这次加上了lvl的参数,因为A的level是1,所以我们查询level不大于3...
网络预排序遍历树算法;修改过的先序遍历树算法;先根遍历树算法 网络释义 1. 预排序遍历树算法 预排序遍历树算法(modified PReorder tree traversal algorithm) 我不是计算机专业的,也没有学过什么数据结构的东西,所以这 … www.knowsky.com|基于262个网页 ...
select * from tree where lft between 1 and 6 and rgt between 7 and 20 order by lft desc 唯一的区别就是排序是反向的就行了。 3 得到某个节点下面的所有节点,且按照树状结构返回 我们用B做例子 select * from tree where lft>2 and right<11 order by lft 拿到的结果是 C,D,E,F,而且顺序也是...
SELECT * FROM tree WHERE lft BETWEEN 2 AND 11 ORDER BY lft ASC; 剩下的问题如何显示层级的缩进了。 以下是代码: [code:1:86c003e7bb] function display_tree($root) { // 得到根节点的左右值 $result = mysql_query('SELECT lft, rgt FROM tree '.'WHERE name="'.$root.'";'); $row = my...
当按照从左到右、一次一层的先序遍历规则为节点赋左、右值时,由于一个节点上被赋了两个值,因此这种方法被称作改进的先序遍历算法(Modified preorder tree traversal algorithm)。预排序树的每一个节点都有一个“左值”和“右值”,且满足如下的规则:
I presented another implementation method, known as "Modified Preorder Tree Traversal (MPTT)". Both satisfy the basic requirements for our use case. So, when you are faced with a programming task that is inherently recursive, as in the use case being demonstrated here, which should you choose...
网络先根遍历树算法
select * from tree where lft between 1 and 6 and rgt between 7 and 20 order by lft desc 唯一的区别就是排序是反向的就行了。 3 得到某个节点下面的所有节点,且按照树状结构返回 我们用B做例子 select * from tree where lft>2 and right<11 order by lft ...