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JPA getSingleResult() or null

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ÓÃ×Ô¼ºÅªµÄÀà getSingleResultOrNullÌæ´ú

 public static <T> T getSingleResultOrNull(TypedQuery<T> query) {
    query.setMaxResults(1);
    List<T> list = query.getResultList();
    if (list.isEmpty()) {
        return null;
    }
    return list.get(0);
}

ÆäËû·½·¨²Î¿¼：http://stackoverflow.com/questions/2002993/jpa-getsingleresult-or-null