infantServiceApi/app/model/api/StoreProductAttrValue.php

<?php
declare (strict_types = 1);

namespace app\model\api;

use think\Model;

/**
 * @mixin \think\Model
 */
class StoreProductAttrValue extends Model
{
    protected $name = 'store_product_attr_value';

    /**
     * 根据规格获取SKU
     * @param int $productId
     * @param string $suk
     * @return array|null
     */
    public function getSkuBySuk($productId, $suk)
    {
        return $this->where('product_id', $productId)
            ->where('suk', $suk)
            ->find();
    }
}