Hibernate无法将数据正确写入mysql

Question

I am trying to write some information about the user who opens the web application which i made. The web app is simple. When open it it shows users ip, user-agent, and the time of the last log into the app. I`ve made this app with these technologies: Spring, Maven, Tomcat, Hibernate and MySQL. It seems that everything is working correctly but when i open the app in browser in do note make a record to Data Base and i must start manually Main.java to make a record but the record is no correct because it does not record the real information but it record NULL everywhere. I have two questions - How to do all this automatically (when i open the web app to have a record in DB) and Why my records are every time NULL.

public class Main {

    public static void main(String[] args) {

        UserInfo user = new UserInfo();
        user.setRollNo(7);
        user.setIp(UserController.ip);
        user.setUserAgent(UserController.userAgent);
        user.setDate((Date) UserController.date);

        SessionFactory sessionFactory = new AnnotationConfiguration()
                .configure().buildSessionFactory();
        Session session = sessionFactory.openSession();
        session.beginTransaction();

        session.save(user);

        session.getTransaction().commit();
        session.close();
    }
}

UserController.java

   @Controller
    public class UserController {

        public static String ip;
        public static String userAgent;
        public static Date date;

        @Autowired
        private HttpServletRequest request;

        @RequestMapping(value = "/connection")
        public ModelAndView getUserInfo() {

            ModelAndView modelandView = new ModelAndView("UserInfo");

            ip = request.getRemoteAddr();
            modelandView.addObject("msg1", "Your IP is " + ip);

            userAgent = request.getHeader("User-Agent");
            modelandView.addObject("msg2", "Your User agent is " + userAgent);

            date = new java.util.Date();
            /*
             * Calendar calendar = Calendar.getInstance(); java.sql.Date startDate =
             * new java.sql.Date(calendar.getTime() .getTime());
             */
            modelandView.addObject("msg3", "Your last log was at " + date);

            return modelandView;

        }

    }

UserInfo.java

@Entity
@Table(name = "USER_INFORMATION")
public class UserInfo {

    @Id
    private int rollNo;
    private String ip;
    private String userAgent;
    private Date date;

    public int getRollNo() {
        return rollNo;
    }

    public void setRollNo(int rollNo) {
        this.rollNo = rollNo;
    }

    public String getIp() {
        return ip;
    }

    public void setIp(String ip) {
        this.ip = ip;
    }

    public String getUserAgent() {
        return userAgent;
    }

    public void setUserAgent(String userAgent) {
        this.userAgent = userAgent;
    }

    public Date getDate() {
        return date;
    }

    public void setDate(Date date) {
        this.date = date;
    }

}

hibernate.cfg.xml

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
    <session-factory>
        <!-- Database connection settings -->
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost:3306/browserinfo</property>
        <property name="connection.username">root</property>
        <property name="connection.password"></property>

        <property name="connection.pool_size">1</property>

        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

        <property name="show_sql">true</property>

        <property name="hbm2ddl.auto">validate</property>

        <mapping class="com.nikola.hellocontroller.UserInfo" />

    </session-factory>
</hibernate-configuration>

Answer 1

According to this:

@novy154 I am trying to make e record to DB with the users IP, user-agent info and the time when the user was lastloged in the app. After that i want to display all records in the app.

First of all, you need to have some DataAccessLayer. Something like

public interface UserInfoRepository {
    void save(UserInfo userInfo);
    Collection<UserInfo> findAll();
}

and it's implementation.

Then maybe some service over the Repository, but it doesn't matter in this case, so let's skip it.

You need to inject your repository into controller and:

1) invoke userInfoRepository.save(newlyCreatedUserInfo)

2) pass all UserInfos to your view (by invoking userInfoRepository.findAll() and putting the result in modelAndView) and display it somehow.

Let me know if you need help implementing this.

But this is just in purpose of learning how to make simple crud-like application, cause this doesn't make any sense. You can't even identify your user, you just want to track each visitor's ip, user info and so on.

// edit: Repository implementation would be something like:

@Repository
@Transactional
public class UserInfoRepositoryImpl implements UserInfoRepository {

    @Autowired
    private SessionFactory sessionFactory;

    @Override
    public void save(UserInfo userInfo) {
        getCurrentSession.save(userInfo);
    }

    @Override
    public Collection<UserInfo> findAll() {

        final Criteria root = getCurrentSession().createCriteria(UserInfo.class);
        return Collections.checkedList(root.list(), UserInfo.class);
    }

    private Session getCurrentSession() {
        return sessionFactory.getCurrentSession();
    }
}

Then in your controller method you need to invoke save(newlyCreatedUserInfo) to store your info in the database and

modelAndView.addObject("userInfos", repository.findAll());

to retrieve all data and pass it to a view.

Of course remember about

...
@Autowired
private UserInfoRepository userInfoRepository;
...

in controller.

Note that since spring-data-jpa provides you more powerful repositories out of the box, this is reinventing a wheel.