public boolean isUniekeNaam(String spelNaam) {



        try (Connection conn = DriverManager.getConnection(Connectie.JDBC_URL)) {
            PreparedStatement query = conn.prepareStatement("Select naam From Spel");
            try (ResultSet rs = query.executeQuery()) {
                while (rs.next()) {
                    spelNaam = rs.getString("naam");



                }
            }

            conn.close();
        } catch (SQLException ex) {
            throw new IllegalArgumentException("A unique name is required");
        }