List<Vkprlist> vks = Vkprlist.getData();

	EntityManagerFactory emf = Persistence
				.createEntityManagerFactory("test2");
	EntityManager em = emf.createEntityManager();
	em.getTransaction().begin();

	Connection con = em.unwrap(Connection.class);

        // do some JDBC processing

	for (Vkprlist vk : vks) {
			em.merge(vk);
	}
		
			
	em.flush();

        // do some JDBC processing
		
	try {
		con.commit();
		} catch (SQLException e) {
		e.printStackTrace();
	}

	em.close();