Data.php

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

class Data extends \Magento\Framework\Model\ResourceModel\Db\AbstractDb
{
    protected function _construct()
    {
        $this->_init('core_config_data', 'config_id');
    }

    protected function _beforeSave(\Magento\Framework\Model\AbstractModel $object)
    {
        if (!$object->getId()) {
            $this->_checkUnique($object);
        }

        if (is_array($object->getValue())) {
            $object->setValue(join(',', $object->getValue()));
        }
        return parent::_beforeSave($object);
    }

    protected function _checkUnique(\Magento\Framework\Model\AbstractModel $object)
    {
        $select = $this->getConnection()->select()->from(
            $this->getMainTable(),
            [$this->getIdFieldName()]
        )->where(
            'scope = :scope'
        )->where(
            'scope_id = :scope_id'
        )->where(
            'path = :path'
        );
        $bind = [
            'scope' => $object->getScope(),
            'scope_id' => $object->getScopeId(),
            'path' => $object->getPath(),
        ];

        $configId = $this->getConnection()->fetchOne($select, $bind);
        if ($configId) {
            $object->setId($configId);
        }

        return $this;
    }

    public function clearScopeData($scopeCode, $scopeIds)
    {
        if (!is_array($scopeIds)) {
            $scopeIds = [$scopeIds];
        }
        $this->getConnection()->delete(
            $this->getMainTable(),
            ['scope = ?' => $scopeCode, 'scope_id IN (?)' => $scopeIds]
        );
    }
}