NextChainPatch.php

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<?php
namespace Magento\TestSetupDeclarationModule3\Setup\Patch\Data;

use Magento\Framework\App\ResourceConnection;
use Magento\Framework\Setup\Patch\DataPatchInterface;
use Magento\Framework\Setup\Patch\PatchRevertableInterface;
use Magento\Framework\Setup\Patch\PatchVersionInterface;

class NextChainPatch implements
    DataPatchInterface,
    PatchRevertableInterface,
    PatchVersionInterface
{
    private $resourceConnection;

    public function __construct(ResourceConnection $resourceConnection)
    {
        $this->resourceConnection = $resourceConnection;
    }

    public static function getVersion()
    {
        return '0.0.6';
    }

    public function getAliases()
    {
        return [];
    }

    public function apply()
    {
        $adapter = $this->resourceConnection->getConnection();
        $refSelect = $adapter->select()->from('reference_table', 'for_patch_testing')
            ->where('`tinyint_ref` = ?', 7);
        $varchar2 = $adapter->fetchOne($refSelect);
        $adapter->update(
            'reference_table',
            ['for_patch_testing' => 'changed__' . $varchar2],
            ['`tinyint_ref` = ?' => 7]
        );
    }

    public function revert()
    {
        $adapter = $this->resourceConnection->getConnection();
        $refSelect = $adapter->select()->from('reference_table', 'for_patch_testing')
            ->where('`tinyint_ref` = ?', 7);
        $varchar2 = $adapter->fetchOne($refSelect);
        $adapter->update(
            'reference_table',
            ['for_patch_testing' => str_replace('changed__', '', $varchar2)],
            ['`tinyint_ref` = ?' => 7]
        );
    }

    public static function getDependencies()
    {
        return [
            LlNextChainPatch::class,
            ZFirstPatch::class
        ];
    }
}