如何使用JPQL查询连接的最大值,如下所示:SELECT MAX(MESSAGENUMBER) FROM ARTICLE left join NEWSGROUP on ARTICLE.NEWSGROUP_ID=NEWSGROUP.ID WHERE NEWSGROUP.newsgroup = "gwene.com.economist"; * ARTICLE.NEWSGROUP_
> subscribed = getFolders(); for (Newsgroupnewsgroup(newsgroup.getNewsgroup());
LOG.fine(newsgroup + " " + messages.size() + " messages");("SELECT n FROM Newsgroup n
在NoResultException的情况下,如何实例化和持久化Newsgroup实体?String fullNewsgroupName = folder.getFullName(); TypedQuery<Newsgroup> query = em.createQuery("SELECT n FROM Newsgroup n WHERE n.newsgroup = :newsG