Spring & JDBC 2 : Insert

<form action="/wizard/create" method="post">
    <label for="wizard-first-name">First name:</label>
    <input id="wizard-first-name" name="firstName" placeholder="Harry" required type="text">

    <label for="wizard-last-name">Last name:</label>
    <input id="wizard-last-name" name="lastName" placeholder="Potter" required type="text">

    <label for="wizard-birthday">Birthday:</label>
    <input id="wizard-birthday" name="birthday" placeholder="1980-07-31" required type="date">

    <label for="wizard-birth-place">Birth Place:</label>
    <input id="wizard-birth-place" name="birthPlace" placeholder="London" required type="text">

    <label for="wizard-biography">Biography:</label>
    <textarea id="wizard-biography" name="biography"></textarea>

    <label for="wizard-is-muggle">Is Muggle ?</label>
    <input id="wizard-is-muggle" name="muggle" type="checkbox" value="true">

    <input type="submit" value="Send">
</form>

@PostMapping("/wizard/create")
public String postWizard(Model model,
                         @RequestParam String firstName,
                         @RequestParam String lastName,
                         @RequestParam Date birthday,
                         @RequestParam String birthPlace,
                         @RequestParam(required = false, defaultValue = "") String biography,
                         @RequestParam(required = false, defaultValue = "false") boolean muggle
) {
    model.addAttribute("wizard", repository.save(firstName, lastName,
            birthday, birthPlace, biography, muggle));

    return "wizard_get";
}

public Wizard save(String firstName, String lastName, Date birthday,
                   String birthPlace, String biography, boolean muggle) {

    try {
        Connection connection = DriverManager.getConnection(
                DB_URL, DB_USER, DB_PASSWORD
        );
        PreparedStatement statement = connection.prepareStatement(
                "INSERT INTO wizard (first_name, last_name, birthday, birth_place, biography, is_muggle) VALUES (?, ?, ?, ?, ?, ?)",
                Statement.RETURN_GENERATED_KEYS
        );
        statement.setString(1, firstName);
        statement.setString(2, lastName);
        statement.setDate(3, birthday);
        statement.setString(4, birthPlace);
        statement.setString(5, biography);
        statement.setBoolean(6, muggle);

        if (statement.executeUpdate() != 1) {
            throw new SQLException("failed to insert data");
        }

        ResultSet generatedKeys = statement.getGeneratedKeys();

        if (generatedKeys.next()) {
            Long id = generatedKeys.getLong(1);
            return new Wizard(id, firstName, lastName, birthday,
                    birthPlace, biography, muggle);
        } else {
            throw new SQLException("failed to get inserted id");
        }
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return null;
}