Magento 2: installData core_config_data #magento2, #installdata, #config

coreConfigData_InstallData.php

<?php
/**
 * InstallData
 *
 * @copyright Copyright © 2019 The Etailers. All rights reserved.
 * @author    [email protected]
 */

namespace FERR\AlternateHreflang\Setup;

use Magento\Framework\Setup\InstallDataInterface;
use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;

/**
 * @codeCoverageIgnore
 */
class InstallData implements InstallDataInterface
{
    /**
     * {@inheritdoc}
     * @SuppressWarnings(PHPMD.ExcessiveMethodLength)
     */
    public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
    {
        $setup->startSetup();

        $data = [
            'scope' => 'default',
            'scope_id' => 0,
            'path' => 'path/to/config_param',
            'value' => 'value',
        ];
        $setup->getConnection()
            ->insertOnDuplicate($setup->getTable('core_config_data'), $data, ['value']);

        $setup->endSetup();
    }
}