abortIf('mysql' !== $this->connection->getDatabasePlatform()->getName(), 'Migration can only be executed safely on \'mysql\'.'); $this->addSql('ALTER TABLE u2f_keys CHANGE key_handle key_handle VARCHAR(128) NOT NULL'); } public function down(Schema $schema): void { // this down() migration is auto-generated, please modify it to your needs $this->abortIf('mysql' !== $this->connection->getDatabasePlatform()->getName(), 'Migration can only be executed safely on \'mysql\'.'); $this->addSql('ALTER TABLE u2f_keys CHANGE key_handle key_handle VARCHAR(64) CHARACTER SET utf8mb4 NOT NULL COLLATE `utf8mb4_unicode_ci`'); } }