SubnetEntityManager.java 文件源码

public static Subnet findByOpenstackId(EntityManager em, String id) {

        CriteriaBuilder cb = em.getCriteriaBuilder();

        CriteriaQuery<Subnet> query = cb.createQuery(Subnet.class);

        Root<Subnet> root = query.from(Subnet.class);

        query = query.select(root)
            .where(cb.equal(root.get("openstackId"), id));

        try {
            return em.createQuery(query).getSingleResult();
        } catch (NoResultException nre) {
            return null;
        }
    }