PHP plurality of field increment or decrement

 
//自增
$res=Db::name('accessories')
            ->where('id',$req['id'])
            ->inc('number',$req['number'])
            ->inc('allputin',$req['number'])
            ->update();

//自减
$res=Db::name('accessories')
            ->where('id',$req['id'])
            ->dec('number',$req['number'])
            ->dec('allputin',$req['number']) 
            ->update();