dbal-mig.php

use Doctrine\DBAL\Schema\Comparator;
use Doctrine\DBAL\Connection;
use Doctrine\DBAL\Configuration;
use Doctrine\DBAL\DriverManager;

$connFrom = DriverManager::getConnection([
    'url' => "mysql://root:root@127.0.0.1/test1",
], new Configuration);

$connTo = DriverManager::getConnection([
    'url' => "mysql://root:root@127.0.0.1/test2",
], new Configuration);

$diff = Comparator::compareSchemas(
    $connFrom->getSchemaManager()->createSchema(),
    $connTo->getSchemaManager()->createSchema(),
);
echo implode(";\n", $diff->toSql($connTo->getDatabasePlatform()));