findByCriteria(detachedCriteria)的使用

为了使用findByCriteria(detachedCriteria)，首先写个接口：

protected RetCode findByCriteria(HibernateDaoSupport dao,DetachedCriteria detachedCriteria) {

        RetCode ret = new RetCode();        
        List results = dao.getHibernateTemplate()
                .findByCriteria(detachedCriteria);
        if (results == null || results.size() == 0) {

            ret.setCode(1001);
            ret.setDesc("无查询数据!");
            ret.setDetail("未找到查询的相应数据");
            ret.setObj(null);
        } else {
            ret.setCode(0);
            ret.setDesc("操作成功!");
            ret.setObj(results);
        }
        return ret;
  } 

然后便可以利用这个接口了：

/**
     * 查出所有处于生效状态的活动
     * @param dbIcTask
     * @param currentPage
     * @param pageSize
     * @return
     */
    public RetCode findAll() {
        return this.findByCriteria(dbIcTaskDAO, getAllUsefuleTaskCriteria());
    }

最后，便是在getAllUsefuleTaskCriteria()这个方法里面写上SQL语句的条件：

private DetachedCriteria getAllUsefuleTaskCriteria() {
        DetachedCriteria crt = DetachedCriteria.forClass(DbIcTask.class);
        crt.add(Restrictions.sqlRestriction("state='1'"));
        crt.add(Restrictions.sqlRestriction("sysdate <= to_date(endtime,'yyyy-mm-dd hh24:mi:ss')"));
        crt.add(Restrictions.sqlRestriction("sysdate >= to_date(begintime,'yyyy-mm-dd hh24:mi:ss')"));
        return crt;

    }