小编RoD*_*RoD的帖子

我正在尝试使用Criteria和ProjectionList获取报告,而我通过hibernate使用它是非常新的.所以我有这个模型:

private Long _userId;

 private Category _category;

 private Long _companyId;

 private Double _amount;

 private Date _date;

我用这个构建查询:

  public List sumPaymentsByUserCategoryPeriod(Category category, Long userId,Integer period){
  GregorianCalendar from = new GregorianCalendar();
  from.add(Calendar.MONTH, -period);
  List<CategoryAmount> resultDTO= new ArrayList<CategoryAmount>();

  Criteria criteria = getSession().createCriteria(Payment.class);
  criteria.add(Restrictions.eq("_category", category));
  criteria.add(Restrictions.eq("_userId",userId));
  criteria.add(Restrictions.between("_date", from.getTime(), new Date()));

  ProjectionList projectionList = Projections.projectionList();
  projectionList.add(Projections.sum("_amount"));
  projectionList.add(Projections.groupProperty("_date"));
  criteria.setProjection(projectionList);
  return  criteria.list();

 }

基本上这种方法会收到一个Category和一个userId来过滤付款记录和一个期间,这个期间将指示从现在到我想要总和多少个月.如何按月分组总和结果？

任何帮助或提示,我会很感激!