private void updateExistedKey(String table,String Key) {
		ArrayList<Data> table_contents = getAllDataFromTable(table);
		if (table_contents != null){
			for (int i = 0; i < table_contents.size(); i++) {
				//semua data dengan key Key menjadi invisible
				if (table_contents.get(i).Key.equals(Key)) table_contents.get(i).setInvisible();
			}
		}
	}