Hibernate实现对多个表进行关联查询

Hibernate实现对多个表进行关联查询？

String sTest = "from tBookInfo book, BookSelection sel where book.id = sel.bookId";
Collection result = new ArrayList();
Transaction tx = null;
try {
　Session session = HibernateUtil.currentSession();
　tx = session.beginTransaction();
　Query query = session.createQuery(sql);
　result = query.list();
　tx.commit();
} catch (Exception e) {
　throw e;
} finally {
　HibernateUtil.closeSession();
}
ArrayList sList = (ArrayList) result;
Iterator iterator1 = sList.iterator();
while (iterator1.hasNext()) {
　Object[] o = (Object[]) iterator1.next();
　tBookInfo bookInfo = (tBookInfo) o[0];
　BookSelection bookSelect = (BookSelection) o[1];
　System.out.println("BookInfo-Title: " + bookInfo.getTitle());
　System.out.println("BookSelection-BookSelectionId: " + bookSelect.getId());
}