WeeklyStatsDataAccessObject.java 文件源码

public static WeeklyStats persist (WeeklyStats stats) {
    if (stats != null) {
           EntityManager em = EMFUtil.getEMFactory().createEntityManager();
           EntityTransaction trans = em.getTransaction();
           try {
               trans.begin();
               em.persist(stats);
               trans.commit();
               return stats;
           } catch (Exception e) {
               e.printStackTrace();
               trans.rollback();
           } finally {
               em.close();
           }
    }
    return null;
}