DefaultEntryDao.java 文件源码

@Override
public int getPageCount(int pagesize) {
    EntityManager em = EntityManagerHelper.getEntityManager();
    int numberofentries = 0;
    try {
        // sql count is always returned as long from JPA
        TypedQuery q = em.createQuery("select count(*) from Entry", Long.class);
        numberofentries =  Math.toIntExact((long)q.getSingleResult());
    } catch(NoResultException nre){

    }
    catch (Exception e){
        throw new RuntimeException("Error getting pagecount", e);
    }
    EntityManagerHelper.closeEntityManager();
    return (int) Math.ceil(numberofentries / pagesize);
}