MigrateDataFromAnotherTable.php

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<?php
declare(strict_types=1);

namespace Magento\Framework\Setup\Declaration\Schema\Db\MySQL\DDL\Triggers;

use Magento\Framework\App\ResourceConnection;
use Magento\Framework\Setup\Declaration\Schema\Db\DDLTriggerInterface;
use Magento\Framework\Setup\Declaration\Schema\Dto\Table;
use Magento\Framework\Setup\Declaration\Schema\ElementHistory;

class MigrateDataFromAnotherTable implements DDLTriggerInterface
{
    const MATCH_PATTERN = '/migrateDataFromAnotherTable\(([^\)]+)\)/';

    private $resourceConnection;

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

    public function isApplicable(string $statement) : bool
    {
        return (bool) preg_match(self::MATCH_PATTERN, $statement);
    }

    public function getCallback(ElementHistory $tableHistory) : callable
    {
        $table = $tableHistory->getNew();
        preg_match(self::MATCH_PATTERN, $table->getOnCreate(), $matches);
        return function () use ($table, $matches) {
            $tableName = $table->getName();
            $oldTableName = $this->resourceConnection->getTableName($matches[1]);
            $adapter = $this->resourceConnection->getConnection($table->getResource());
            $select = $adapter->select()->from($oldTableName);
            $adapter->query($adapter->insertFromSelect($select, $tableName));
        };
    }
}