thinkphp地区管理功能

thinkphp地区管理功能的实现，实现效果图：
数据库结构：

    CREATE TABLE `sp_region` (
      `Id` INT(11) NOT NULL AUTO_INCREMENT,
      `parent_id` INT(11) DEFAULT NULL,
      `region_name` VARCHAR(120) CHARACTER SET gbk DEFAULT NULL,
      `region_type` SMALLINT(5) DEFAULT NULL,
      `agency_id` SMALLINT(5) UNSIGNED NOT NULL DEFAULT '0',
      `is_show` SMALLINT(5) NOT NULL DEFAULT '0',
      PRIMARY KEY (`Id`)
    ) ENGINE=MYISAM AUTO_INCREMENT=3417 DEFAULT CHARSET=utf8 COLLATE=utf8_bin

前台代码：

     <form name="form1" method="post" id="myfrom" action="__URL__/add">
        <table class="table_form" style="border:0;">
            <tr>
                <th align="left">
                {if $region_type=3}{$regionts}：
                    <input type="text" class="text-input" name="region_name" >
                    <input type="hidden" name="region_type" value="{$region_type}" />
                    <input type="hidden" name="parent_id" value="{$Id}" />
                    <input type="submit" class="buttonAdd" value="提交操作"/>
                {/if}
                    <a href="{:U('Association/region',array("regiontype"=>$region_typeyuanshi,'parentid'=>$fuID))}">返回上一级</a>
                </th>
            </tr>
        </table>
    </form>
    <div class="fl" style="border:1px solid #66CCFF;">
        <table width="100%" border="0" cellpadding="0" cellspacing="0" >
            <tr><td height="15" style="background:#66CCFF; margin-top:0px; ">{$region_type}</td></tr>
            <tr bgcolor="#FFFFFF">
                <td>
                    <present name="list">
                    <volist name="list" id="vo">
                        <div class='regionys'><span id="regionname{$vo['Id']}">{$vo['region_name']}</span><span>|</span>
                        {if $region_type=3}
                            <a href="{:U('Association/region',array("regiontype"=>$region_type,'parentid'=>$vo['Id']))}">管理</a>
                        {/if}
                        <a href="{:U('Association/delRegion',array("regionid"=>$vo['Id'],'parentid'=>$vo['Id']))}" >删除</a></div>
                    </volist>
                    <else />
                        <div class='regionys'>暂无地区</div>
                    </present>
                </td>
            </tr>
            <tr><td height="5" style="background:#fff; margin-top:0px; "></td></tr>
        </table>
    </div>
    <p class="i">
        <font color="red">注视：</font>1级地区：国家 2级地区：省份 3级地区：市级 4级地区：县/区
    </p>

  public function region(){
        $parent_id = intval(trim($_GET['parentid']));//父ID
        $region = D("region");
        $regionarr = $region->where(" parent_id=".$parent_id)->select();
        if( $_GET['regiontype']==""  ){
            $region_type = '0';
            $regionts = "新增1级地区";
        }else{
            if($regionarr[0]['Id'] == ""){
                //取出上一级的region_type
                $regiontypearr = $region->where('id='.$parent_id)->field('region_type')->find();
                $region_type = $regiontypearr['region_type']+1;
            }else{
                $region_type = $regionarr[0]['region_type'];
            }
            $regionts = $region_type+1;
            $regionts = "新增".$regionts."级地区";
        }
        $this->assign("region_type",$region_type);//属于省份还是市
        $region_typeyuanshi=$region_type-1;
        $this->assign("region_typeyuanshi",$region_typeyuanshi);
        $this->assign("regionts",$regionts);//文字提示
        if(  $regionarr[0]['parent_id'] != 0){
            $fuidarr = $region->where("id=".$regionarr[0]['parent_id'])->find();//用fuID去取fuID的parent_id;
            $this->assign("fuID",  $fuidarr['parent_id']  );//返回上一级的时候，取的fuID
        }
        if( $region_type == 0 ){
            $this->assign('Id',  '0' );
        }else{
            $this->assign('Id', $parent_id );
        }
        $this->assign('list',$regionarr);
        $this->display();
    }
    function delRegion(){
        $region = D("Region");
        //删除
        if( $_GET['regionid'] != "" ){
            //先判断是否有子分类
            $regionid= intval( $_GET['regionid'] );
            $ziarr = $region->where("parent_id=".$regionid)->select();
            if( $ziarr[0]['Id'] != "" ){
                $this->error("请先删除子分类！");
            }else{
                $region->Id=$regionid;
                if($region->delete()){
                    $this->success();
                }else{
                    $this->error("删除失败");
                }
            }
        }
    }
    public function add(){
        $Region = D('Region');
        $region_name=trim($_POST['region_name']);
        if(!$region_name) $this->error("新增地区不能为空！");
        $Region->region_name = $region_name;
        $Region->region_type = trim($_POST['region_type']);
        $Region->parent_id   = trim($_POST['parent_id']);
        if($Region->add()){
            $this->success('添加成功！');
        }else{
            $this->error($Region->getError());
        }
    }

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