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我有以下 SQL 查询返回我需要的结果：

SELECT     
Person.FirstName,Person.LastName,OrganisationUnit.Name AS UnitName, RS_SkillsArea.Name AS SkillsArea, Activity.Name AS ActivityName, Activity.CLASS, Activity.StartsOn, Activity.EndsOn, 

SUM(ActivityCost.CostAmount) / 

NULLIF(
 (
  SELECT COUNT(Registration.ActivityId) FROM         
  Registration INNER JOIN AttemptResultsSummary ON Registration.CurrentResultId = AttemptResultsSummary.AttemptResultsSummaryId AND 
  Registration.RegistrationId = AttemptResultsSummary.RegistrationId
  WHERE     (Registration.Status = 1) AND (Registration.ActivityId = Activity.ActivityId) 
  AND (AttemptResultsSummary.AttendanceStatus <> 1)
 ) 
 ,0) 
 AS IndividualCost

 FROM         Registration AS Registration_1 INNER JOIN
                      Activity ON Registration_1.ActivityId = Activity.ActivityId INNER JOIN
                      Person ON Registration_1.PersonId = Person.PersonId INNER JOIN
                      OrganisationUnit ON Person.OrganisationUnitId = OrganisationUnit.OrganisationUnitId INNER JOIN
                      AttemptResultsSummary ON Registration_1.CurrentResultId = AttemptResultsSummary.AttemptResultsSummaryId AND 
                      Registration_1.RegistrationId = AttemptResultsSummary.RegistrationId AND Activity.ActivityId = AttemptResultsSummary.ActivityId AND 
                      Person.PersonId = AttemptResultsSummary.PersonId INNER JOIN 
                      ActivityCost ON Activity.ActivityId = ActivityCost.ActivityId LEFT OUTER JOIN
                          (SELECT     Category.Name, Category.CategoryId
                            FROM          Category INNER JOIN
                                                   CategoryGroup ON Category.[Group] = CategoryGroup.CategoryGroupId
                            WHERE      (CategoryGroup.Name = N'Skills Area')) AS RS_SkillsArea INNER JOIN
                      ActivityInCategory ON RS_SkillsArea.CategoryId = ActivityInCategory.CategoryId ON Activity.ActivityId = ActivityInCategory.ActivityId

AND AttemptResultsSummary.AttendanceStatus <> 1



GROUP BY RS_SkillsArea.Name, Person.FirstName,Person.LastName,Activity.Name, Activity.CLASS, Activity.StartsOn, Activity.EndsOn, Activity.ActivityId, OrganisationUnit.Name, 
                      AttemptResultsSummary.CompletionStatus, AttemptResultsSummary.AttendanceStatus

HAVING AttemptResultsSummary.AttendanceStatus <> 1

本质上，有什么方法可以使用 DetachedCriteria 或 HQL 对实体而不是直接 SQL 执行相同的操作？

这两个挑战是：

  1. 每行成本计算的查询。

  2. 派生表连接（需要是外连接，因为该值可能不存在）

我会很感激任何指示。由于基础设施的变化和（缺乏）重构支持的问题，我宁愿不使用 SQL

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1 回答 1

2

看看官方的 HQL 示例@http ://docs.jboss.org/hibernate/stable/core/reference/en/html/queryhql.html#queryhql-examples。

在我看来，使用 HQL 更容易实现“派生连接”。

在性能方面，我的第一个开始是使用您喜欢的分析器来了解使用本机 SQL 的成本，然后是使用 NHProf 在 NHibernate 上的成本。

于 2010-07-19T12:16:01.630 回答