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<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
namespace Magento\Framework\Setup\Declaration\Schema\Db;
/**
* Statement aggregator.
*
* Statements are concatenated conditionally, decides which statements go separately and which may be concatenated.
*
* @api
*/
class StatementAggregator
{
/**
* Statements batch.
* Statements that can be merged with each other are ain each bunch.
*
* @var array
*/
private $statementsBank = [];
/**
* Verify that statements can be merged.
*
* @param Statement $bankStatement
* @param Statement $statement
* @return bool
*/
private function canDoMerge(Statement $bankStatement, Statement $statement)
{
/** Modify reference only for 2 different requests */
if ($statement instanceof ReferenceStatement && $statement->getName() === $bankStatement->getName()) {
return false;
}
/**
* If we add trigger after some specific statement, then we say that statement is final
* and can`t be updated anymore. Otherwise trigger can fail.
*
* Example: while migrating data from one column to another and another column should be removed,
* we need to ensure that we create new column, finalize statement, do insert and only after insert
* do all other statements like DROP old column.
*/
return empty($bankStatement->getTriggers()) &&
$statement->getType() === $bankStatement->getType() &&
$statement->getTableName() === $bankStatement->getTableName() &&
$statement->getResource() === $bankStatement->getResource();
}
/**
* Add one or few statements and divide them if they can`t be executed in one query.
*
* For example, foreign key modification can`t be done in one query.
* First existing foreign key should be dropped and only then new one can be created.
*
* @param Statement[] $statements
*/
public function addStatements(array $statements)
{
foreach ($statements as $statement) {
/** Go through each bank and see whether statement can be added to it or not */
foreach ($this->statementsBank as $bankId => $bank) {
foreach ($bank as $bankStatement) {
if (!$this->canDoMerge($bankStatement, $statement)) {
continue 2;
}
}
$this->statementsBank[$bankId][] = $statement;
continue 2;
}
$this->statementsBank[][] = $statement;
}
}
/**
* Return all statements separated in batches.
*
* @return Statement[]
*/
public function getStatementsBank()
{
return $this->statementsBank;
}
}