@Override
    public Object getValueAt(int rowIndex, int columnIndex) {
        List<String> list = DataBaseUtils.getInstance().getDBManagementSystems();
        String dbms = list.get(rowIndex);
        switch (columnIndex) {
            case 0:
                return dbms;
            case 1:
                return DataBaseUtils.getInstance().getURL(dbms);
            case 2:
                return DataBaseUtils.getInstance().getDriver(dbms);
            case 3:
                return DataBaseUtils.getInstance().getUser(dbms);
            case 4:
                return DataBaseUtils.getInstance().getPassword(dbms);
            default:
                return null;
        }
    }