AbstractResource.php

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<?php
namespace Magento\ProductAlert\Model\ResourceModel;

abstract class AbstractResource extends \Magento\Framework\Model\ResourceModel\Db\AbstractDb
{
    protected function _getAlertRow(\Magento\Framework\Model\AbstractModel $object)
    {
        $connection = $this->getConnection();
        if ($object->getCustomerId() && $object->getProductId() && $object->getWebsiteId()) {
            $select = $connection->select()->from(
                $this->getMainTable()
            )->where(
                'customer_id = :customer_id'
            )->where(
                'product_id  = :product_id'
            )->where(
                'website_id  = :website_id'
            );
            $bind = [
                ':customer_id' => $object->getCustomerId(),
                ':product_id' => $object->getProductId(),
                ':website_id' => $object->getWebsiteId(),
            ];
            return $connection->fetchRow($select, $bind);
        }
        return false;
    }

    public function loadByParam(\Magento\Framework\Model\AbstractModel $object)
    {
        $row = $this->_getAlertRow($object);
        if ($row) {
            $object->setData($row);
        }
        return $this;
    }

    public function deleteCustomer(\Magento\Framework\Model\AbstractModel $object, $customerId, $websiteId = null)
    {
        $connection = $this->getConnection();
        $where = [];
        $where[] = $connection->quoteInto('customer_id=?', $customerId);
        if ($websiteId) {
            $where[] = $connection->quoteInto('website_id=?', $websiteId);
        }
        $connection->delete($this->getMainTable(), $where);
        return $this;
    }
}