使用 nhibernate 获取关系计数大于 x 的实体

Question

说我有一个这样的实体

public class Something
{
    public int Id{get;set;}
    public string Name{get;set;}
    public IList<SomeOther> Assosiation{get;set}
}

我如何使用 nhibernate 查询以使用 Criteria API 获取具有超过 10 个关联的所有东西实体？

干杯科林

Answer 1

像这样的东西：

var dc = DetachedCriteria.For<SomeOther>()
    .SetProjection(Projections.GroupProperty("Something.Id"))
    .Add(Restrictions.Gt(Projections.RowCount(), 10));

var criteria = session.CreateCriteria(typeof (Something))
    .Add(Subqueries.PropertyIn("Id", dc));

这会产生这样的东西：

SELECT this_.Id             as Id7_0_,
       this_.Title          as Title7_0_
FROM   Something this_
WHERE  this_.Id in (SELECT   this_0_.SomethingId as y0_
                    FROM     SomeOther this_0_
                    GROUP BY this_0_.SomethingId
                    HAVING   count(* ) > 10 /* @p0 */)