JPA Database Utilities

Make a class out of the following code to insert and update from the database. This will make your life easier as a programmer because you'll be able to reuse this code in any application that uses JPA.

import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.EntityTransaction;
import javax.persistence.NoResultException;
import javax.persistence.TypedQuery;

public class CustomerDB {

    public static void insert(Customer customer) {
        EntityManager em = DBUtil.getEmFactory().createEntityManager();
        EntityTransaction trans = em.getTransaction();
        trans.begin();
        try {
            em.persist(user);
            trans.commit();
        } catch (Exception e) {
            System.out.println(e);
            trans.rollback();
        } finally {
            em.close();
        }
    }

    public static void update(Customer customer) {
        EntityManager em = DBUtil.getEmFactory().createEntityManager();
        EntityTransaction trans = em.getTransaction();
        trans.begin();
        try {
            em.merge(user);
            trans.commit();
        } catch (Exception e) {
            System.out.println(e);
            trans.rollback();
        } finally {
            em.close();
        }
    }

    public static void delete(Customer customer) {
        EntityManager em = DBUtil.getEmFactory().createEntityManager();
        EntityTransaction trans = em.getTransaction();
        trans.begin();
        try {
            em.remove(em.merge(user));
            trans.commit();
        } catch (Exception e) {
            System.out.println(e);
            trans.rollback();
        } finally {
            em.close();
        }
    }
}