private String get(String id) {
        if (id.equals(UserColumn.ACCOUNT_ID)) {
            return account_id;
        }
        else if (id.equals(UserColumn.ROLE)) {
            return role;
        }
        else if (id.equals(UserColumn.LOGIN_ID)) {
            return login_id;
        }
        else if (id.equals(UserColumn.LOGIN_PW)) {
            return login_pw;
        }
        else if (id.equals(UserColumn.USER_NAME)) {
            return user_name;
        }
        else if (id.equals(UserColumn.USER_PHONE)) {
            return user_phone;
        }
        else if (id.equals(UserColumn.USER_EMAIL)) {
            return user_email;
        }
        return "";
    }