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/**	 * 随机取出N条记录	 * 	 * @param filetype	 * @param position	 * @param dialog_box_type	 * @param total	 *            记录总数	 * @param count	 *            要取出几条	 * @return	 */	@Override	public List
   
     getAdvs(String filetype, String position,			String dialog_box_type, int total, int count) {		String hql = "from Adv as adv where adv.id is not null ";		if (StringUtils.isNotBlank(filetype)) {			hql += " and adv.filetype ='" + filetype + "' ";		}		if (StringUtils.isNotBlank(position)) {			hql += " and adv.position ='" + position + "' ";		}		if (StringUtils.isNotBlank(dialog_box_type)) {			hql += " and adv.type.id ='" + dialog_box_type + "' ";		}		int first = total - count;		first = first >= 0 ? first : 0;		first = (int) Math.floor(Math.random() * first);		return getSession().createQuery(hql).setFirstResult(first)				.setMaxResults(count).list();	}
   

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