update.java

public void update(Book book) throws SQLException {
    PreparedStatement preparedStatement = database.getConnection().prepareStatement("update books set title = ?, description = ? where id = ?");

    preparedStatement.setString(1, book.getTitle());
    preparedStatement.setString(2, book.getDescription());
    preparedStatement.setInt(3, book.getId());

    preparedStatement.executeUpdate();
}