Question

我正在尝试在NHibernate中使用QueryOver创建查询，但没有成功。我需要得到的结果如下：

select mn.Story_ID from Membership_Updates mn
join Updates upd on mn.Story_ID = upd.Story_ID
where mn.MembershipUser_ID = 1
group by mn.Story_ID having MAX(mn.DismissTime) <= MAX(upd.CreationDate)

我的课程：

public class MembershipUpdates
{
  public MembershipUpdates()
  {
    DismissTime = DateTime.Now;
  }

  public virtual int Id  { get; set; }
  public virtual MembershipUser User { get; set; }
  public virtual Story Story { get; set; }
  public virtual DateTime DismissTime { get; set; }
}

public class Updates 
{
  public Updates()
  {
    CreationDate = DateTime.Now;
  }

  public virtual int Id  { get; set; }
  public virtual DateTime CreationDate { get; private set; }
  public virtual Story Story { get; set; }
  public virtual string Message{ get; set; }
}

也许我错过了一些明显的东西

Answer 1

我可能错了，但我认为QueryOver不允许你加入不相关的实体（不使用子查询）。

我会使用HQL：

select mn.Story
from MembershipUpdates mn, Updates upd
where upd.Story = upd.Story
and mn.User.id = 1
group by mn.Story
having MAX(mn.DismissTime) <= MAX(upd.CreationDate)

旁注：您的实体类名称应该是单数。

在nhibernate中加入queryover

1 个答案: