jpql dynamic query

@PersistenceContext(unitName = "디비이름")
private EntityManager entityManager;

String jpql = "SELECT m FROM member m WHERE ";

if(!id.isEmpty()) {
	jpql += "m.memberId = :id ";
}

jpql += "ORDER BY createTimestamp DESC";

TypedQuery <Member> query = entityManager.createQuery(jpql, Member.class);

if(!id.isEmpty()) {
	query.setParameter("memberId", id);
}

List<Member> members = query.getResultList();