virtual void delUser(UserId user);
virtual void setUserSetting(UserId userId, const QString &settingName, const QVariant &data);
virtual QVariant getUserSetting(UserId userId, const QString &settingName, const QVariant &defaultData = QVariant());
virtual void delUser(UserId user);
virtual void setUserSetting(UserId userId, const QString &settingName, const QVariant &data);
virtual QVariant getUserSetting(UserId userId, const QString &settingName, const QVariant &defaultData = QVariant());