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优化NHibernate查询

orm nhibernate sql-server .net c#

asgerhallas · 技术社区 · 16 年前

在我的系统中,我对一个有很多集合的聚合进行集中计算。我需要在计算之前加载所有集合,因此我使用了一个在根上连接集合的多标准。

IMultiCriteria criteria = session.CreateMultiCriteria()
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("ACollection", JoinType.LeftOuterJoin)
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("BCollection", JoinType.LeftOuterJoin)
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("CCollection", JoinType.LeftOuterJoin)
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("ECollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("FCollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("GCollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("HCollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("JCollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("KCollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("LCollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("MCollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("NCollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("OCollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("PCollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("QCollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("RCollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("SCollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("TCollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("UCollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("VCollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("WCollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("XCollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("YCollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("ZCollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("AACollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("ABCollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("ACCollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("ADCollection", JoinType.LeftOuterJoin))
.Add(DetachedCriteria.For<Building>()
     .Add(Restrictions.Eq("Id", BuildingId))
     .CreateCriteria("AECollection", JoinType.LeftOuterJoin));

2 回复 | 直到 16 年前

Chris Marisic 16 年前

这样我就可以一次性加载整个聚合,而忘记连接。

因此,对于遇到上述情况的人来说,可以考虑使用面向文档的方法。

我的初步测试显示了希望:)

http://mookid.dk/oncode/archives/1057

asgerhallas 16 年前

我建议的第一件事是启动您的Sql Profiler并获取传入的Sql的精确副本。然后,我会将其放入Sql Tuner中,这很可能会建议创建新的索引并添加/更新部分或所有表的统计信息。

在这一点上,我会先进行性能测试,然后再尝试对HQL进行性能调优。