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按月分组,在Hibernate中使用标准

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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!

2 回答

  • 0

    我找到了答案,而且非常简单 . 我更改了ProjectionList标准中的“groupProperty”:

    projectionList.add(Projections.sqlGroupProjection(
        "month({alias}.DATE) as month, year({alias}.DATE) as year", 
        "month({alias}.DATE), year({alias}.DATE)", 
        new String[]{"month","year"}, 
        new Type[] {Hibernate.DOUBLE}));
    

    好的 . 我将解释sqlGroupProjection . 第一个参数是“select”之后的查询部分,例如:

    Select [firstPartOfSqlGroupProjection] * boo;
    

    ”是休眠在查询中用于引用表的别名 .

    sqlGroupProjection函数的第二个参数是按标准分组,第三个参数是您将从组中获取的列名,最后是您将使用的数据类型 .

  • 39

    你可以在hibernate中使用SQLQuery,这是一个例子:

    public List<MonthlyPoint> groupByMonth(ChartRequest request){
    
       SQLQuery query = getSession().createSQLQuery("SELECT \n" +
            "sum(this_.amount) as amount, \n" +
            "extract(month from this_.fecha) as month, \n" +
            "extract(year from this_.fecha) as  year\n" +
            "FROM jornada this_ \n" +
            "GROUP BY \n" +
            "month, \n" +
            "year \n" +
            "ORDER BY \n" +
            "year asc, \n" +
            "month asc");
    
          query.setResultTransformer(Transformers.aliasToBean(MonthlyPoint.class));
          return query.list();
    }
    
    
    public class MonthlyPoint {
        private Double year;
        private Double month;
        private Double amount;
      //-- getters and setters here --
    }
    

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