laravel框架的增删改查 M层

class SugModel extends Model
{
    
    
    //指定表
    protected $table = "sug";
    //指定id
    protected $primaryKey = "sug_id";
    //时间戳
    public $timestamps = false;

    //添加数据
    public static function add($data){
    
    
      return  self::insert($data);
    }


    //展示数据
    public static function show(){
    
    
     return self::paginate(5);

    }

    //删除数据
    public static function del($id){
    
    
       return self::where('sug_id',$id)->delete();
    }



    //修改数据
    public static function updates($id){
    
    
       return self::where('sug_id',$id)->first();
    }


    //开始修改数据
    public static function up($data,$id){
    
    
      return  self::where("sug_id",$id)->update($data);
    }
}