For循环在Hibernate中保存数据，但不添加所有项

Question

configureSessionFactory();
Session session = null;
Transaction tx=null;
try {
    session = sessionFactory.openSession();
    SyndEntry entry = null;
    URL feedUrl = new URL(rssUrl);
    SyndFeedInput input = new SyndFeedInput();
    SyndFeed feed = input.build(new XmlReader(feedUrl));
    tx = session.beginTransaction();
    BroadcastItem item = new BroadcastItem();
    for (int i = 0 ; i < 5 ; i++) {
         entry = (SyndEntry) feed.getEntries().get(i);
         item.setMessage(entry.getTitle());
         item.setLinkUrl(entry.getLink());
         session.save(item);
    }
    tx.commit();
} catch (Exception ex) {
  ex.printStackTrace();
  // Rolling back the changes to make the data consistent in case of any failure in between multiple database write operations.
   tx.rollback();
} finally{
  if(session != null) {
      session.close();
  }
}

不支持嵌套事务

1. 如何实现我想要的（循环5次，每次向数据库中添加一个数据项）？
2. 为什么提交在这里只运行一次？

Answer 1

当你写的时候

    BroadcastItem item = new BroadcastItem();

    for (int i = 0 ; i < 5 ; i++) {
        entry = (SyndEntry) feed.getEntries().get(i);

        item.setMessage(entry.getTitle());
        item.setLinkUrl(entry.getLink());

        session.save(item);
    }

第一次保存（创建）项，在循环的其他时间，保存（更新）项。

您只需将broadcastitem的创建放在循环中，如下所示：

    for (int i = 0 ; i < 5 ; i++) {
        entry = (SyndEntry) feed.getEntries().get(i);
        BroadcastItem item = new BroadcastItem();

        item.setMessage(entry.getTitle());
        item.setLinkUrl(entry.getLink());

        session.save(item);
    }