ApplianceEntityMgr.java 文件源码

public static Appliance findByModel(EntityManager em, String model) {
    CriteriaBuilder cb = em.getCriteriaBuilder();

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

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

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

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