ItemDaoImpl.java 文件源码

@Override
@Transactional(propagation = Propagation.MANDATORY)
public ListMultimap<Long, HistoryEvent> getHistoryForItemIds(Collection<Long> ids)
{
    if( ids.isEmpty() )
    {
        return ImmutableListMultimap.of();
    }
    List<Object[]> history = getHibernateTemplate().findByNamedParam(
        "select h, i.id from Item i join i.history h where i.id in (:items) order by index(h)", "items", ids);
    ListMultimap<Long, HistoryEvent> multiMap = ArrayListMultimap.create();
    for( Object[] historyRow : history )
    {
        multiMap.put((Long) historyRow[1], (HistoryEvent) historyRow[0]);
    }
    return multiMap;
}