Question

Im working with hibernate and mysql, and i got it working to put data in the DB via hibernate, but when i try to retrieve data it always returns null…

Session session = HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();
User user = (User) session.get(User.class, username);
session.getTransaction().commit();

User is a class with annotations, but the variable user will always be null, even if i put a username that i know exists in the DB. Username is the ID of the table, so it should find it

EDIT

Can it be that i use <property name="hbm2ddl.auto">create</property> in the config? What should i use so the DB create the table only if it does not exist?

Answer 1

the create schema option will delete all the existing data!
Check out the documentation : here

Following are the specified options:

• validate: validate the schema, However no changes are made to the database.
• update: update the schema.
• create: creates the schema, destroying previous data.
• create-drop: drop the schema at the end of the session.

Try using the update version. The rest of the code snippet looks fine to me.

Hope this helps