一个简单的数据库数据存入取出动作，为什么出现有关问题

public static void addParent() throws InterruptedException { // 写死        Date insertTime = new Date();        Parent parent = new Parent();        parent.fullName = "新增家长";        parent.fullNamePinyin = "xin zeng jia zhang";        parent.save();//往数据库里面存入一条数据        List<Long> idFromDB = methodForDocs.getParentList(insertTime);//紧接着从数据库里面取出该条数据（更具createTime字段）        System.out.println("idFromDBSize:" + idFromDB.size());        for (int i = 0; i < idFromDB.size(); i++) {            System.out.println("***idFromDB:" + idFromDB.get(i));        }        renderJSON(new Result("测试通过！"));    }

（该方法是没有问题的）public static List<Long> getParentList(Date insertTime) {        String hql = "select id from Member where createTime>?";        System.out.println("insertTime:" + insertTime.toString());        List<Long> ids = Member.find(hql, insertTime).fetch();        return ids;    }