[英]NHibernate Projections and “Having” clause
I'm using NHibernate to query my database with the criteria API. 我正在使用NHibernate使用条件API查询我的数据库。 My criteria is below:
我的标准如下:
ICriteria c = Session.CreateCriteria(typeof(Transaction));
ProjectionList projections = Projections.ProjectionList();
projections.Add(Projections.Sum("Units"), "Units");
projections.Add(Projections.GroupProperty("Account"), "Account");
projections.Add(Projections.GroupProperty("Security"), "Security");
c.SetProjection(projections);
This is working fine, but what I would like is a way to be able to limit the query to only return when the "Units" property is > 0. In SQL I would simply us a Having Units > 0
clause however I haven't been able to find a way to do this in NHibernate. 这工作正常,但我想要的是一种方法,能够限制查询只在“Units”属性> 0时返回。在SQL中我只是我们一个
Having Units > 0
子句但是我没有能够在NHibernate中找到一种方法。 Does anyone have any ideas or is my only option to use HQL? 有没有人有任何想法或是我唯一的选择使用HQL?
You can access the ProjectionCriteria from the Criteria object. 您可以从Criteria对象访问ProjectionCriteria。
...
c.SetProjection(projections)
.ProjectionCriteria
.Add(Restrictions.Ge("Units", 0));
EDIT: This solution doesn't currently work, however it should work in NHibernate 2.1.0 编辑:此解决方案目前不起作用,但它应该在NHibernate 2.1.0中工作
For whomever drops by here with a similar problem, I just solved it this way: 对于那里有类似问题的人,我只是这样解决了:
IProjection howMany = Projections.Count("Id").As("HowMany");
ICriteria criteria = session
.CreateCriteria<L10N>()
.SetProjection(
howMany,
Projections.GroupProperty("Native"),
Projections.GroupProperty("Locale")
);
criteria.Add(Restrictions.Gt(howMany,1));
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