被这句话吓到了，怎么理解这段代码? 400 报错

被这句话吓到了，怎么理解这段代码? 400 报错 public DataPackage<Template> getUntransmitTemplates(int pageNo, int pageSize)
throws Exception {
StringBuffer hql = new StringBuffer("FROM Template t where status_Id=");
hql.append(Constant.FlowStatus.Audited.getValue());
hql.append(" and transmitState in(").append(
Constant.TransmitState.Untransmit.getValue());
hql.append(",").append(Constant.TransmitState.Fault.getValue()).append(
")");
hql.append(" and transmitFaultTime<").append(Constant.FAULT_TIME);
// 默认失败次数小于3，需要优化
hql.append(" and state=" + Constant.VALID + " order by templateId");
return queryPagination(hql.toString(), pageNo, pageSize);
}