无限级分类、、、但是效率不是最好的。。。大家有没有更快更好的效率的代码呢？
用递归等到类别多的时候就会影响效率了！
求分享！
class.sql
-- -- 表的结构 `class` -- set names utf8; CREATE TABLE `class` ( `id` int(10) NOT NULL auto_increment, `name` varchar(250) character set utf8 default NULL, `classid` int(10) default NULL, `sort` int(10) not null default '0', PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=11 ; -- -- 导出表中的数据 `class` -- INSERT INTO `class` (`id`, `name`, `classid`, `sort`) VALUES (1, '中国', 0, 1), (2, '广西', 1, 1), (3, '桂林', 2, 2), (4, '广东', 1, 2), (5, '北京', 1, 3), (6, '东莞', 4, 10), (7, '南宁', 2, 10), (8, '阳朔', 3, 10), (9, '柳州', 2, 10), (10, '广州', 4, 10);
index.php
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无限级分类</title>
<style type="text/css">
* {
padding:0;
margin:0;
}
body {
font: 14px Arial, Helvetica, sans-serif;
overflow-x: hidden;
overflow-y:auto;
color:#444444;
}
#main {
width:600px;
margin:20px auto;
}
#main table{
margin-top:8px;
width:100%;
border-collapse:collapse;
border-spacing:0px;
BACKGROUND-COLOR: #EFEFEF;
border:0px;
}
#main table td{
line-height:20px;
border:1px solid #FFF;
padding:5px;
}
#main table thead td {
background:#C6C6C6;
FONT-SIZE:15px;
text-align:center;
line-height:23px;
font-weight:bold;
}
.input {
border-top: 1px inset;
border-left: 1px inset;
padding:2px 3px;
}
</style>
</head>
<body>
<p id="main"> 分类列表 添加分类
<?php
$mysql = new mysql_Class('localhost','root','');
$mysql -> select_db('test');
switch($_GET['action']){
case 'add':
$class_arr=array();
$sql = "select * from `class` order by sort asc, id Desc";
$query = $mysql -> query($sql);
while($row = $mysql -> fetch_array($query)){
$class_arr[] = array($row['id'],$row['name'],$row['classid'],$row['sort']);
}
?>
<?php
break;
case 'act_add':
$sql = "INSERT INTO `class` (`name`,`classid`,`sort`) VALUES('".$_POST['name'];
$sql .= "',".$_POST['classid'].",".$_POST['sort'].")";
$mysql -> query($sql);
msg('添加成功!','http://blog.csdn.net/phpfenghuo/article/details/18733323?action=');
break;
case 'edit':
$class_arr=array();
$sql = "select * from `class` order by sort asc, id Desc";
$query = $mysql -> query($sql);
while($row = $mysql -> fetch_array($query)){
$class_arr[] = array($row['id'],$row['name'],$row['classid'],$row['sort']);
}
$sql = "select * from `class` where id=".$_GET['id'];
$query = $mysql -> query($sql);
$row = $mysql -> fetch_array($query);
if($row){
?>
<?php
}else{
msg('要修改的记录不存在!','http://blog.csdn.net/phpfenghuo/article/details/18733323?action=');
}
break;
case 'act_edit':
$sql = "select id from `class` where id=".$_POST['id'];
$query = $mysql -> query($sql);
$row = $mysql -> fetch_array($query);
if($row){
if($row['id']==$_POST['classid']){
msg('修改失败,不能自己是自己的子分类!','http://blog.csdn.net/phpfenghuo/article/details/18733323?action=');
}else{
$sql = "update `class` set `name`='".$_POST['name']."',`classid`=".$_POST['classid'];
$sql .= ",`sort`=".$_POST['sort']." where `id`=".$_POST['id'];
$mysql -> query($sql);
msg('修改成功!','http://blog.csdn.net/phpfenghuo/article/details/18733323?action=');
}
}
break;
case 'del':
$sql = "select * from `class` where id=".$_GET['id'];
$query = $mysql -> query($sql);
$row = $mysql -> fetch_array($query);
if($row){
$mysql -> query("delete from `class` where id=".$_GET['id']);
msg('删除成功!','http://blog.csdn.net/phpfenghuo/article/details/18733323?action=');
}else{
msg('记录不存在!','http://blog.csdn.net/phpfenghuo/article/details/18733323?action=');
}
break;
case '':
$class_arr=array();
$sql = "select * from `class` order by sort asc, id Desc";
$query = $mysql -> query($sql);
while($row = $mysql -> fetch_array($query)){
$class_arr[] = array($row['id'],$row['name'],$row['classid'],$row['sort']);
}
?>
<table class="table">
<thead>
<tr>
<td >分类名称</td>
<td width="60"><p align="center">排序</p></td>
<td width="80"><p align="center">操作</p></td>
</tr>
</thead>
<?php infinite_arr(0,0);?>
</table>
<?php
break;
}
?>
</p>
</body>
</html>
<?php
function msg($msg,$url)
{
echo "<script type=\"text/javascript\">alert('$msg');window.location.href='$url';</script>";
}
function infinite_arr($m,$id)
{
global $class_arr;
global $classid;
global $mysql;
if($id=="") $id=0;
$n = str_pad('',$m,'-',STR_PAD_RIGHT);
$n = str_replace("-"," ",$n);
for($i=0;$i<count($class_arr);$i++){
if($class_arr[$i][2]==$id){
echo "<tr>\n";
echo "<td>".$n."|----".$class_arr[$i][1]."</td>\n";
echo " <td><p align=\"center\">".$class_arr[$i][3]."</p></td>\n";
echo " <td><p align=\"center\">修改";
echo " 删除";
echo "</p></td>\n";
echo " </tr>\n";
infinite_arr($m+1,$class_arr[$i][0]);
}
}
}
function infinite_select($m,$id,$index)
{
global $class_arr;
$n = str_pad('',$m,'-',STR_PAD_RIGHT);
$n = str_replace("-"," ",$n);
for($i=0;$i<count($class_arr);$i++){
if($class_arr[$i][2]==$id){
if($class_arr[$i][0]==$index){
echo "<option value=\"".$class_arr[$i][0]."\" selected=\"selected\">".$n."|----".$class_arr[$i][1]."</option>\n";
}else{
echo "<option value=\"".$class_arr[$i][0]."\">".$n."|----".$class_arr[$i][1]."</option>\n";
}
infinite_select($m+1,$class_arr[$i][0],$index);
}
}
}
/**
*-------------------------数据库操作类-----------------------------*
*/
class mySql_Class
{
function __construct($host, $user, $pass)
{
@mysql_connect($host,$user,$pass) or die("数据库连接失败!");
mysql_query("SET NAMES 'utf8'");
}
function select_db($db)//连接表
{
return @mysql_select_db($db);
}
function query($sql)//执行SQL语句
{
return @mysql_query($sql);
}
function fetch_array($fetch_array)
{
return @mysql_fetch_array($fetch_array, MYSQL_ASSOC);
}
function close() //关闭数据库
{
return @mysql_close();
}
function insert($table,$arr) //添加记录
{
$sql = $this -> query("INSERT INTO `$table` (`".implode('`,`', array_keys($arr))."`) VALUES('".implode("','", $arr)."')");
return $sql;
}
}
?>
![[Web-Frontend] Node.js-Schnellstart](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
