OneToOne migration sample

<?php
namespace TYPO3\Flow\Persistence\Doctrine\Migrations;

use Doctrine\DBAL\Migrations\AbstractMigration,
	Doctrine\DBAL\Schema\Schema;

/**
 * Auto-generated Migration: Please modify to your need!
 */
class Version20150407145620 extends AbstractMigration {

	/**
	 * @param Schema $schema
	 * @return void
	 */
	public function up(Schema $schema) {
		// this up() migration is autogenerated, please modify it to your needs
		$this->abortIf($this->connection->getDatabasePlatform()->getName() != "mysql");

		$this->addSql("ALTER TABLE acme_test_domain_model_subject DROP FOREIGN KEY FK_C87B915E60577090");
		$this->addSql("DROP INDEX UNIQ_C87B915E60577090 ON acme_test_domain_model_subject");
		$this->addSql("ALTER TABLE acme_test_domain_model_subject DROP related");
	}

	/**
	 * @param Schema $schema
	 * @return void
	 */
	public function down(Schema $schema) {
		// this down() migration is autogenerated, please modify it to your needs
		$this->abortIf($this->connection->getDatabasePlatform()->getName() != "mysql");

		$this->addSql("ALTER TABLE acme_test_domain_model_subject ADD related VARCHAR(40) DEFAULT NULL COLLATE utf8_unicode_ci");
		$this->addSql("ALTER TABLE acme_test_domain_model_subject ADD CONSTRAINT FK_C87B915E60577090 FOREIGN KEY (related) REFERENCES acme_test_domain_model_related (persistence_object_identifier)");
		$this->addSql("CREATE UNIQUE INDEX UNIQ_C87B915E60577090 ON acme_test_domain_model_subject (related)");
	}
}