public function up(Schema $schema)
{
$this->abortIf($this->connection->getDatabasePlatform()->getName() != "mysql");
$this->addSql("ALTER TABLE typo3_typo3cr_domain_model_workspace DROP FOREIGN KEY typo3_typo3cr_domain_model_workspace_ibfk_1");
$this->addSql("ALTER TABLE typo3_typo3cr_domain_model_workspace ADD CONSTRAINT FK_71DE9CFBE9BFE681 FOREIGN KEY (baseworkspace) REFERENCES typo3_typo3cr_domain_model_workspace (persistence_object_identifier) ON DELETE SET NULL");
}