nhibernate - 帮助 NHibernate Criteria 查询 groupby 属性

Question

我有以下查询，

SearchTemplate Template = new SearchTemplate();
            Template.Criteria = DetachedCriteria.For(typeof(table1));

            Template.Criteria.CreateCriteria("table2", "Usr", NHibernate.SqlCommand.JoinType.InnerJoin)

                 .SetProjection(Projections.ProjectionList()
                 .Add(Projections.Count("Usr.ID"), "UserCount")
                  .Add(Projections.GroupProperty("Location"), "ALocation")
                  .Add(Projections.GroupProperty("Company"), "ACompany")
                  .Add(Projections.GroupProperty("Usr.Designation"), "ADesignation"));  

上面的查询给了我数据，

Location   Company    Designation   Count
  Florida      A          Manager       3
  Florida      A          QA            5
  Texas        B          Manager       6
  Texas        B          QA            7

有没有办法改变查询，以便它提供数据，

  Location   Company    Manager    QA               
  Florida      A           3       5
  Texas        B           6       7

这里 Manager 和 QA 是唯一可以进入指定字段的可能值。

Answer 1

代替

.Add(Projections.Count("Usr.ID"), "UserCount")
.Add(Projections.GroupProperty("Usr.Designation"), "ADesignation")

您需要两个预测，每个结果列一个：

.Add(Projections.Sum(Projections.Conditional(
                                 Restrictions.Eq("Usr.Designation", "Manager"),
                                 Projections.Constant(1),
                                 Projections.Constant(0)))
.Add(Projections.Sum(Projections.Conditional(
                                 Restrictions.Eq("Usr.Designation", "QA"),
                                 Projections.Constant(1),
                                 Projections.Constant(0)))