tp框架怎么根据传的参数查询数据？

<form method="post">    <input type="text" name="name" />    <button type="submit">Submit</button></form>

class FirstController extends Controller {    public function qq(){    	$qq=new \Model\qqModel();        $qq->field('name');        $info=$qq->select();    	$this->assign('info',$info);        $this->display();    }}

<form action="{:U('Index/qq')}" method="post">   //不懂这里的action后面的意思 我把里面Index/qq换成first/qq试了一下还是报错    <input type="text" name="name" />    <button type="submit">Submit</button></form>

public function search(){    $name=I("post.name");    $info=M("qq")->where('name like %'.$name.'%')->select();    var_dump($info);}