怎么判断时间类型的值是否为空
数据库有个一列是datetime的类型
if(receiveTime.toString()!= null && receiveTime.toString().length()>0 )
{
findCondition.put("f.receiveTime", "%" + receiveTime.toString().trim() + "%");
hql+=" and receiveTime= '" + receiveTime.toString()+"'" ;
}
这样写不对,获取不到一直报空指针错误