thinkphp上传图片预览并且保存到数据库，求一个代码例子！谢谢！！

/**
 * @desc   ä¿å­˜æ–°å¢žå¹¿å‘Š
 */
public function saveAdd(){
$userInfo = $this->getUserInfo();
if(!$userInfo['id'] || $userInfo['id'] == 0){
$this->error('请重新登陆添加广告');
exit;

}
$_POST['user_id'] = $userInfo['id'];

        if($_POST['areaType'] == 'all') unset($_POST['area']);
        if( $_POST['areaType'] == 'custom' && (count($_POST['area']) == 34 || $_POST['area'] == '') ) unset($_POST['area']);

        $id = null;

        if($_POST['uploadType'] == 'single'){
            /*$picInfo = getimagesize($_POST['pic']);
            $sizeInfo = D('AdSizeConfig')->getDataById($_POST['size_id']);

            if(($sizeInfo['width'] != $picInfo[0]) || $sizeInfo['height'] != $picInfo[1]){
                $this->error('您上传的图片长或宽不正确！');
            }*/

            $id = D($this->className)->addData($_POST);
        }

        if($_POST['uploadType'] == 'multi'){
            foreach($_POST['picArr'] as $key => $val){
                $data[$key] = $_POST;
                $data[$key]['pic'] = $val;
                $picInfo = getimagesize("./" . $val);
                $map['width'] = $picInfo[0];
                $map['height'] = $picInfo[1];

                $data[$key]['size_id'] = D('AdSizeConfig')->where($map)->getField('id');

                $id = D($this->className)->addData($data[$key]);
            }
        }

        if($id){
         //添加广告积分,获取展示时间，获取展示区域
         $diff_time_start = strtotime($_POST['start_date']);
         $diff_time_end = strtotime($_POST['end_date']);
$diff_days = floor(($diff_time_end -$diff_time_start)/86400) +1;
$area_ratio = ($_POST['areaType'] == 'all') ? 5 : 1;
$uid = $userInfo['id'];
//$method = 'ad_saveadd';
//$points = -intval($diff_days) * $area_ratio;
//$desc = '这么多'.$points.'分数';
//D('ScoreHistory')->setScoreByRule($method,'',$uid,'');
            $this->userAddScore();
            $this->success('添加成功！','/Home/Ad/index');
        }else{
            $this->error( D($this->className)->getLastError() );
        }
}

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