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<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
declare(strict_types=1);
namespace Magento\Framework\Setup\Declaration\Schema\Db;
use Magento\Framework\Setup\Declaration\Schema\ElementHistory;
/**
* DDL triggers is events that can be fired:
* - after element creation;
* - before/after element modification
* - before element removal
*
* Trigger is used to make changes in data not in schema, e.g migrate data from column of one table to
* column of another table.
*
* Please note: triggers are used to serve needs of some operations, that can`t be described with declarative schema,
* for example: renaming. Renaming implemented with removal column with old name and creating with new one.
* Question with data is solved with help of triggers, that allows to migrate data.
* This approach is correct from prospective of declaration but is not so fast as ALTER TABLE is.
* So if you need to perform some renaming operations quickly, please use raw SQL dump instead, that can be taken with
* help of --dry-run mode
*
* @api
*/
interface DDLTriggerInterface
{
/**
* Check whether current trigger can be applied to current statement.
*
* @param string $statement
* @return bool
*/
public function isApplicable(string $statement) : bool ;
/**
* Setup callback to current statement, can generate new statements.
*
* @param ElementHistory $elementHistory
* @return callable
*/
public function getCallback(ElementHistory $elementHistory) : callable;
}