DefaultBaseDao.java 文件源码

/**
 * Returns a page of objects.
 *
 * @param entityClass The entity class.
 * @param page The page index (zero indexed).
 * @param pageSize The page size.
 * @return A page of objects.
 */
@Override
public <T extends BaseEntity> List<T> readPage(
        final Class<T> entityClass,
        final int page,
        final int pageSize) {

    final CriteriaBuilder cb = em.getCriteriaBuilder();
    final CriteriaQuery<T> cq = cb.createQuery(entityClass);
    final Root<T> root = cq.from(entityClass);
    cq.select(root);
    cq.orderBy(cb.desc(root.get("id")));
    return em.createQuery(cq)
            .setFirstResult(page * pageSize)
            .setMaxResults(pageSize)
            .getResultList();
}