myc/app/common/dao/store/product/ProductGroupSkuDao.php

<?php

namespace app\common\dao\store\product;

use app\common\dao\BaseDao;
use app\common\model\store\product\ProductGroupSku;

class ProductGroupSkuDao extends BaseDao
{
    public function getModel(): string
    {
        return ProductGroupSku::class;
    }

    public function clear($id)
    {
        return $this->getModel()::getDB()->where('product_group_id', $id)->delete();
    }

    public function incStock($product_group_id, $unique, $inc)
    {
        return ProductGroupSku::getDB()->where('product_group_id', $product_group_id)->where('unique', $unique)->inc('stock', $inc)->update();
    }

    public function descStock($product_group_id, $unique, $inc)
    {
        return ProductGroupSku::getDB()->where('product_group_id', $product_group_id)->where('unique', $unique)->dec('stock', $inc)->update();
    }

}