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<?php
namespace Doctrine\DBAL\Platforms\MySQL;
use Doctrine\DBAL\Platforms\MySQLPlatform;
use Doctrine\DBAL\Schema\Comparator as BaseComparator;
use Doctrine\DBAL\Schema\Table;
use function array_diff_assoc;
use function array_intersect_key;
/**
* Compares schemas in the context of MySQL platform.
*
* In MySQL, unless specified explicitly, the column's character set and collation are inherited from its containing
* table. So during comparison, an omitted value and the value that matches the default value of table in the
* desired schema must be considered equal.
*/
class Comparator extends BaseComparator
{
/**
* @internal The comparator can be only instantiated by a schema manager.
*/
public function __construct(MySQLPlatform $platform)
{
parent::__construct($platform);
}
/**
* {@inheritDoc}
*/
public function diffTable(Table $fromTable, Table $toTable)
{
$defaults = array_intersect_key($fromTable->getOptions(), [
'charset' => null,
'collation' => null,
]);
if ($defaults !== []) {
$fromTable = clone $fromTable;
$toTable = clone $toTable;
$this->normalizeColumns($fromTable, $defaults);
$this->normalizeColumns($toTable, $defaults);
}
return parent::diffTable($fromTable, $toTable);
}
/**
* @param array<string,mixed> $defaults
*/
private function normalizeColumns(Table $table, array $defaults): void
{
foreach ($table->getColumns() as $column) {
$options = $column->getPlatformOptions();
$diff = array_diff_assoc($options, $defaults);
if ($diff === $options) {
continue;
}
$column->setPlatformOptions($diff);
}
}
}
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