screen/application/common/model/SysConfig.php

<?php

namespace app\common\model;

use think\Model;

class SysConfig extends Model
{
    const level_config='sys_level_discount';
    public static function set($name,$value){
        $ex=self::where('name',$name)->find();
        if($ex){
            $ex['value']=$value;
        }else{
            $ex=new self();
            $ex['name']=$name;
            $ex['value']=$value;
        }
        $ex->save();
    }

    public static function look($name,$default=null){
        $ex=self::where('name',$name)->lock(true)->find();
        if($ex){
            return $ex['value'];
        }
        return $default;
    }

    public function setValueAttr($v){
        if(is_array($v)){
            return json_encode($v,JSON_UNESCAPED_UNICODE);
        }
        return $v;
    }

    public function getValueAttr($v){
        $en=json_decode($v,true);
        if(!is_null($en)){
            return $en;
        }
        return $v;
    }
}