How to get returning ID in JPA after native query insert

Question

I have the following code in JPA to return an auto generated ID after inserting using native query:

Query q = em.createNativeQuery("insert into .... returning ID", Long.class);
q.executeUpdate();

However, I'm getting the following error:

A result was returned when none was expected

Answer 1

好的，那很容易。我刚刚使用了q.getSingleResults（），效果很好！

Query q = em.createNativeQuery(sql);
BigInteger biid = (BigInteger) q.getSingleResult();
long id = biid.longValue();