ConnectionHelper.java 文件源码

private static void _criteria(DbService dbService) {
    final EntityManager em = dbService.getEntityManager();

    // INSERT new record
    em.getTransaction().begin();
    em.persist(new Account("A"));
    em.persist(new Account("B"));
    em.persist(new Account("C"));
    em.getTransaction().commit();



    CriteriaBuilder builder = em.getCriteriaBuilder();
    CriteriaQuery<Account> query = builder.createQuery(Account.class);
    Root<Account> acc = query.from(Account.class);

    Predicate cond = builder.gt(acc.get("id"), 1);
    query.where(cond);
    TypedQuery<Account> q = em.createQuery(query);
    List<Account> resultList = q.getResultList();
    System.out.println(resultList);


}