public Book findOne(String find) {
        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.query(TABLE_NAME, new String[]{KEY_NUMBER,
                        KEY_JUDUL, KEY_NOTASI, KEY_TEMA}, KEY_NUMBER + "=?",
                new String[]{find}, null, null, null, "1");
        if (cursor.moveToFirst()) {
            do {
                Book buku = new Book(cursor.getString(0), cursor.getString(1), cursor.getString(2), cursor.getString(3));
                return buku;
            }while (cursor.moveToNext());
        }
        cursor.close();
        db.close();
        return null;
    }