效果：
CREATE TABLE `NewTable` (`id` int(11) UNSIGNED NOT NULL AUTO_INCREMENT ,`pid` int(10) UNSIGNED ZEROFILL NOT NULL ,`name` varchar(30) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL ,`path` varchar(200) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL ,PRIMARY KEY (`id`))ENGINE=MyISAMDEFAULT CHARACTER SET=utf8 COLLATE=utf8_general_ciAUTO_INCREMENT=53CHECKSUM=0ROW_FORMAT=DYNAMICDELAY_KEY_WRITE=0;
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title></head><body> <h1>四个字段的无限分类</h1> <form action="{:url('add')}" method="post"> 请选择上级分类：<select name="pid"> <option value="0">顶级分类</option> {foreach $cates as $vo} <option value={$vo.id}>|{$vo.pre}{$vo.name}</option> {/foreach} </select><br/> 请填写分类的名称：<input type="text" name="name"/></br> <input type="submit" value="添加"> </form> </body></html><?phpnamespace appindexcontroller;use thinkDb;use thinkController;use appmodelCategory; class Index extends Controller{ public function index() { //添加分类的界面 //查询所有的分类 $db=Db::name('categroy'); $data=$db->order('concat(path,"-",id)')->select(); #order('concat(path,"-",id)')自动排序 foreach ($data as &$cate) { $prefix=''; $i=count(explode("-", $cate['path'])); for($n=0;$n<=$i;$n++){ $prefix.="--"; } $cate['pre']=$prefix; } $this->assign('cates',$data); return $this->fetch(); } public function add(){ $db=Db::name('categroy'); if($_POST['pid']==0){ $_POST['path']=0; }else{ $_POST['path']=$db->where('id='.$_POST['pid'])->value('path')."-".$_POST['pid']; } $name=$_POST['name']; if($db->insert($_POST)){ $this->success('添加成功'); }else{ $this->error('添加失败'); } #原理：4个字段 /* ID PID NAME PATH 1 0 服装 0-1 2 0 游戏 0-2 3 1 男装 0-1-3 4 3 上衣 0-1-3-4 */ }}还有一个没有写完的递归无限分类
public function user(){ $db=Db::name('categroy1'); // $data=$db->getTree(); $opt=$db->getOption($data); $this->assign('opt',$opt); $this->assign('cates',$data); return $this->fetch(); } public function doAdd(){ //执行添加数据 $db=Db::name('categroy1'); if($db->insert()){ $this->success('添加成功',url('index')); }else{ $this->error('添加失败',url('index')); } return $this->fetch(); }Model
<?phpclass CategoryModel extends Model{ #通过上级分类的主键id号查询子类 public function getTree($pid=0){ $data=$this->where('pid='.$pid)->select(); foreach($data as &$cate){ #通过该分类的主键id查询该分类的子类 $cate['cates']=$this->getTree($cate['id']); } return $data; } #拼装属性结构 #通过一个数组组装option public function getOption($data){ static $i=0; for($n=0;$n<=$i*2;$n++){ $prefix.="-"; } foreach ($data as $cate) { $opt.="<option value='".$cate['id']."'>".$prefix.$cate['name']."</option>"; #判断该分类下是否包含子类，如果有子类，将数组传入接着拼装 if(!empty($case['cates'])){ $i++; $opt.=$this->getOption($case['cases']); }else{ $i=0; } return $opt; } }}
