Question

我有一个有状态的支持bean，在@Create方法（下面显示的查询）中调用以下的hibernate查询：

@Override
@SuppressWarnings("unchecked")
public List<Session> getUserSessions(User user, Date startDate, Date endDate){
    String s = "select distinct s from Session s";
    s += " where s.user = :user and s.date >= :startDate and s.date <= :endDate order by s.date desc";
    Query query = this.getEntityManager().createQuery(s);
    System.out.println("Making Query");
    query.setParameter("user", user);
    query.setParameter("startDate", startDate);
    query.setParameter("endDate", endDate);
    return query.getResultList();
}

但是，当我打开SQL日志时，我可以看到查询运行了两次？见下面的日志

16:49:04,563 DEBUG [actions.sessions.SessionActionsBean] Searching for sessions from:     Wed Feb 01 00:00:00 GMT 2012 to: Wed Feb 29 23:59:59 GMT 2012
16:49:04,564 INFO  [STDOUT] Making Query
16:49:04,564 INFO  [STDOUT] Making Query
16:49:04,565 INFO  [STDOUT] Hibernate: select distinct session0_.session_id as session1_101_, session0_.av_pace as av2_101_, session0_.calories as calories101_, session0_.date_created as date4_101_, session0_.date as date5_101_, session0_.distance as distance101_
16:49:04,565 INFO  [STDOUT] Hibernate: select distinct session0_.session_id as session1_101_, session0_.av_pace as av2_101_, session0_.calories as calories101_, session0_.date_created as date4_101_, session0_.date_swam as date5_101_, session0_.distance as distance101_

从JSF调用的支持bean只运行一次，但DAO查询bean似乎两次调用getUserSessions（）？

有这个原因，还是记录问题？

由于

Answer 1

这两个查询并不完全相同。第一个SELECT子句要求列session0_.date，而第二个选择session0_.date_swam。

你确定没有其他事情发生吗？

SEAM hibernate查询DAO执行两次

1 个答案: