public void OpdaterMedlem() {
        try {
            Connection minConnection;
            minConnection = DriverManager
                .getConnection(
                    "jdbc:sqlserver://LAPTOP-3LA06A4H\\SQLEXPRESS;databaseName=YodaFitness;user=sa;password=123123");

            Statement stmt = minConnection.createStatement();

            int id = Integer.parseInt(txfIdOpdater.getText().trim());
            String navn = txfNavnOpdater.getText();
            String adresse = txfAdresseOpdater.getText();
            int tlf = Integer.parseInt(txfTelefonOpdater.getText().trim());

            String sql =
                "exec updateMedlem" + " " + id + ", '" + navn + "', " + "'" + adresse + "', " + tlf;
            System.out.println(sql);

            stmt.executeUpdate(sql);

            if (stmt != null) {
                stmt.close();
            }
            if (minConnection != null) {
                minConnection.close();
            }

        }
        catch (Exception e) {
            System.out.println("fejl:  " + e.getMessage());
        }
    }