I am trying to save a object to database but it's not getting saved into the database.
UserDetails.java
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name="USER_DETAILS")
public class UserDetails {
@Id @GeneratedValue()
@Column(name="USER_ID")
private int userId;
@Column(name="USER_NAME")
private String userName;
//...getter and setters
}
App.java
public class App {
public static void main(String[] args) {
UserDetails user = new UserDetails();
user.setUserName("abc");
SessionFactory factory = new Configuration().configure().buildSessionFactory();
Session session = factory.openSession();
Object o = session.save(user);
System.out.println("User saved with id - " +o);
System.out.println("HashCode of session 1st "+session.hashCode());
session.close();
session = factory.openSession();
System.out.println("HashCode of session 2nd "+session.hashCode());
UserDetails user1 =(UserDetails)session.get(UserDetails.class,Integer.valueOf(o.toString()));
System.out.println(user1.getUserName());
session.close();
}
}
Logs:
Hibernate: insert into USER_DETAILS (USER_ID, USER_NAME) values (default, ?)
Hibernate: values identity_val_local()
User saved with id - 1
HashCode of session 1st 9299042
HashCode of session 2nd 12206609
Hibernate: select userdetail0_.USER_ID as USER1_0_0_, userdetail0_.USER_NAME as USER2_0_0_ from USER_DETAILS userdetail0_ where userdetail0_.USER_ID=?
abc
I am not using the transaction and I know if I put the session.save code within session.beginTransaction() and session.getTransaction().commit() the data will be saved in database. But as I am also doing a session.get on the ID which I am getting while doing session.save() how am I getting the object back?
If it's first level cache then how .. because I am also closing the session and opening a new session.I have also not configured any second level cache.
Please provide valuable inputs.
