Question

我在Header和Detail之间有一对多，如下面的类

所示

public class Header
{
    public virtual string ScriptNumber { get; set; }
    public virtual IList<Detail> Details { get; set; }
    public virtual string StartTime { get; set; }
}

public class Detail
{
    public virtual string ScriptNumber { get; set; }
    public virtual DateTime UpdatedDate { get; set; }
    public virtual Header ProgramHeader { get; set; }   
}

我正在尝试通过ScriptNumber查询Detail以分组，并从Header表中获取相应的StartTime。任何人都可以帮我如何做到这一点。目前我的NHibernate查询是：

var changesInDetail = _session.QueryOver<Detail>()
                        .Where(x => x.UpdatedDate.IsBetween(changedFrom).And(changedTo))
                        .SelectList(list => list.SelectGroup(pr => pr.ScriptNumber))
                        .Future<string>();

How to get the StartTime from Header for the grouped by value in Detail?

以下按预期工作。任何人都可以确认这是否是最佳方法？

        var changedScriptsInDetail1 = _session.QueryOver<Detail>(() => detailAlias)
                .JoinQueryOver(d => d.ProgramHeader, () => headerAlias)
                .Where(() => detailAlias.UpdatedDate.IsBetween(changedFrom).And(changedTo))
                .SelectList(list => list
                    .SelectGroup(pr => pr.ScriptNumber)
                    .SelectGroup(()=>headerAlias.StartTime)
                 )
                 .List<object[]>();

Answer 1

    var changedScriptsInDetail1 = _session.QueryOver<Detail>(() => detailAlias)
            .JoinQueryOver(d => d.ProgramHeader, () => headerAlias)
            .Where(() => detailAlias.UpdatedDate.IsBetween(changedFrom).And(changedTo))
            .SelectList(list => list
                .SelectGroup(pr => pr.ScriptNumber)
                .SelectGroup(()=>headerAlias.StartTime)
             )
             .List<object[]>();

NHibernate group by parentId in child，并从父表中获取此parentId的值

1 个答案: