【发布时间】:2014-08-16 15:57:47
【问题描述】:
为了计算二叉树中的下线数量,我正在尝试以下脚本,方法是创建 2 个数据库用于注册和成员下线结构。它确实有效。
但是成员结构数据库增长非常快。导致二叉树中的 n 级将生成 n 条记录用于单用户注册。我只是想知道如果用户在 1000 级注册,那么它将在单用户注册中创建 1000 条记录。
此系统还有其他解决方案吗?
完整的长脚本是:
CREATE TABLE IF NOT EXISTS `member` (
`id` int(255) NOT NULL AUTO_INCREMENT,
`username` varchar(55) CHARACTER SET utf8 NOT NULL,
`upline` varchar(55) CHARACTER SET utf8 NOT NULL,
`position` varchar(10) NOT NULL,
`sponsor` varchar(55) CHARACTER SET utf8 NOT NULL,
`_left` varchar(55) CHARACTER SET utf8 NOT NULL,
`_right` varchar(55) CHARACTER SET utf8 NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=7 ;
制作下线结构表:
CREATE TABLE IF NOT EXISTS `net_downline` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(60) NOT NULL,
`upline` varchar(60) NOT NULL,
`level` int(7) NOT NULL,
`position` varchar(10) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=9 ;
从简单或基本的注册表中获得:
$newuser = htmlentities(trim($_POST['user']));
$sponsor = htmlentities(trim($_POST['sponsor']));
$upline = htmlentities(trim($_POST['upline']));
$position = htmlentities(trim($_POST['position']));
在注册过程中,执行此树步骤:
// 1. register new member
$users->dummyRegister($newuser, $sponsor, $upline, $position);
// 2. update upline
$users->dummyUpdateUpline($newuser, $upline, $position);
// 3. create donwline structure of binary tree
$level=0;
$memberid=$newuser;
do{
$getdata=$users->dummyGetUpline($memberid);
$uplne=$getdata[2];
$posi=$getdata[3];
$level++;
if($uplne!==''){
$users->dummyInsert_NetDownline($newuser, $uplne, $posi, $level);
}
$memberid=$uplne;
}
while($memberid!='');
该脚本的“用户”类:
<?php // start class
class Users{
private $db;
public function __construct($database) {
$this->db = $database;
}
public function dummyRegister($username, $sponsor, $upline, $position, $today){
$query = $this->db->prepare("INSERT INTO `member` (`username`, `sponsor`, `upline`, `position`, `entry_date` ) VALUES (?, ?, ?, ?, ?) ");
$query->bindValue(1, $username);
$query->bindValue(2, $sponsor);
$query->bindValue(3, $upline);
$query->bindValue(4, $position);
$query->bindValue(5, $today);
try{
$query->execute();
}catch(PDOException $e){
die($e->getMessage());
}
}
public function dummyUpdateUpline($username, $upline, $position){
if ($position=='left') {
$query = $this->db->prepare("UPDATE `member` SET `_left`=? WHERE username=? ");
}elseif ($position=='right') {
$query = $this->db->prepare("UPDATE `member` SET `_right`=? WHERE username=? ");
}
$query->bindValue(1, $username);
$query->bindValue(2, $upline);
try{
$query->execute();
}catch(PDOException $e){
die($e->getMessage());
}
}
public function dummyGetUpline($newuser) {// for demo
$query = $this->db->prepare("SELECT * FROM `member` WHERE `username`= ?");
$query->bindValue(1, $newuser);
try{
$query->execute();
$rows = $query->fetch();
return $rows;//['upline'];
} catch(PDOException $e){
die($e->getMessage());
}
}
public function dummyInsert_NetDownline($newuser, $upline, $posi, $level){// for demo
$query = $this->db->prepare("INSERT INTO `net_downline` (`username`, `upline`, `position`, `level` ) VALUES (?, ?, ? ,?) ");
$query->bindValue(1, $newuser);
$query->bindValue(2, $upline);
$query->bindValue(3, $posi);
$query->bindValue(4, $level);
try{
$query->execute();
}catch(PDOException $e){
die($e->getMessage());
}
}
}// endclass
创建initial.php并放在顶部regitration php脚本:
<?php
if(!isset($_SESSION)) { session_start(); }
require 'conn/database.php'; // in folder conn
require 'clas/users.php'; // in folder class
$users = new Users($db);
}
?>
这个处理数据库连接(clas/database.php 脚本):
<?php
$config = array(
'host' => 'localhost',
'username' => 'root',
'password' => '',
'dbname' => 'sampledatabase'
);
$db = new PDO('mysql:host=' . $config['host'] . ';dbname=' . $config['dbname'], $config['username'], $config['password']);
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
【问题讨论】:
-
在关系数据库中处理树并不像在应用程序中那么简单。在常识中,adjanced-tree 是一种设计反模式
-
我建议您为此使用nested sets。使用 NS,计算到节点的路径将像
SELECT x WHERE x.left < node.left AND x.right > node.right一样简单。 -
georg,你能写出使用NS的示例脚本吗?
-
@user3706926:啊,你已经在使用它了,对吧?那么,究竟是什么问题呢?
-
我遇到了成员结构的数据库文件问题。规模越来越大。我认为这不是正常的乔治。难以处理大型用户。