screen/application/common/model/ViewUnique.php

<?php

namespace app\common\model;

use think\db\Query;
use think\Model;
/**
 */
class ViewUnique extends Model
{
    protected $pk='date';
    public static function add(){
        $date=strtotime(date('Y-m-d 00:00:00'));
        $has=self::where('date',$date)->find();
        if($has){
            $has->setInc('num');
        }else{
            self::create([
                'date'=>$date,
                'num'=>1,
            ]);
        }
    }
}