Question

How can I write DAO method which will return as a result only first entry from the database. For instance lets say I’m looking at Users table and I want to retrieve only the first entry, I’d declare method like:

public User getFirstUser(){
    //method logic
}

EDIT:

User has primary key id if that matters at all.

I apologize if this question is too simple/stupid/whatever I’m beginner with Java so I’m trying new things. thank you

My attempt :

   public User getFirstUser(){
            try { 
                final String getQuery = "SELECT * FROM Users WHERE Id = (SELECT MIN(Id) FROM Users)"; 
                final Query query = getSession().createQuery(getQuery); 
                final int rowCount = query.executeUpdate(); // check that the rowCount is 1 
                log.debug("get successful"); 
//             return what??
            } catch (RuntimeException re) { 
                log.error("get not successful", re); 
                throw re; 
            } 
    }

Answer 1

You can

• use:

  Query query = session.createQuery("from User");
  query.setMaxResults(1);
  User result = (User) query.uniqueResult();
  

• use User user = session.get(User.class, id); if you know the ID upfront.