function replaceBook(Book $newBook) { $db = new ServerDatabase(); $db->newQuery("UPDATE book SET author='%2', title='%3', image='%4', category=%5 WHERE id=%1"); $db->addParameter($newBook->id); $db->addParameter($newBook->author); $db->addParameter($newBook->title); $db->addParameter($newBook->image); $db->addParameter($newBook->category); $db->execute(); return $db->getRowsAffected() > 0; }