JPA run a query postres sql native code example

Example: sql request with jpa hiberna

Query q = em.createNativeQuery("SELECT a.firstname, a.lastname FROM Author a");
List<Object[]> authors = q.getResultList();
 
for (Object[] a : authors) {
    System.out.println("Author "
            + a[0]
            + " "
            + a[1]);
}