LabelEntityMgr.java 文件源码

public static Label findByValue(EntityManager em, String labelValue, Long vcId) {

        CriteriaBuilder cb = em.getCriteriaBuilder();

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

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

        query = query.select(root)
                .where(cb.equal(root.get("value"), labelValue),
                        cb.equal(root.join("securityGroupMembers").join("securityGroup").join("virtualizationConnector").get("id"), vcId));

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