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"));

以上查询为我提供了数据

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

有没有办法更改查询，以便将数据提供为

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

此处Manager和QA是唯一可以进入指定字段的值。

Answer 1

而不是

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

您需要两个投影，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)))

帮助NHibernate Criteria查询groupby属性

1 个答案: