Question

我在QueryOver中遇到问题，其中使用Group by并在where子句中有一些标准。想要在Having子句中使用SUM（）值移动某些条件，但每次它出现在Where子句中并导致错误。 **Error** ="*An aggregate may not appear in the WHERE clause unless it is in a subquery contained in a HAVING clause or a select list, and the column being aggregated is an outer reference*"

Conjunction conjunction = Restrictions.Conjunction();
Conjunction havingconjun = Restrictions.Conjunction();

conjunction.Add<Vendor>(p => v.Name == "Some Vendor");
havingconjun.Add(Restrictions.Gt(
   Projections.Sum(Projections.Property(() => v.Payments),
   Convert.ToDouble(SomeInvoice.Value)));

var reportModels =
            Session.QueryOver<Vendor>(() => v)
    .Where(conjunction)
    .Where(havingconjun)
    .SelectList(list => list
                    .SelectGroup(() => v.Number).WithAlias(() => vModel.VendorNumber)
                    .SelectGroup(() => vtypeCode.Code).WithAlias(() => vModel.VendorType)
                    .SelectGroup(() => v.Name).WithAlias(() => vModel.VendorName))
             .TransformUsing(Transformers.AliasToBean<VendorAnalysisReportModel>())
             .List<VendorAnalysisReportModel>();

预期结果：

SELECT 
    V.VENDORNUMBER, V.VENDORTYPE, V.VENDORNAME, SUM(V.PAYMENTS)
 FROM VENDOR V
    WHERE V.NAME = "Some Vendor"
 GROUP 
    BY V.VENDORNUMBER, V.VENDORTYPE, V.VENDORNAME
 HAVING SUM(V.PAYMENTS) > somevalue

立即行动：

SELECT 
    V.VENDORNUMBER, V.VENDORTYPE, V.VENDORNAME, SUM(V.PAYMENTS)
 FROM VENDOR V
    WHERE V.NAME = "Some Vendor" AND
    SUM(V.PAYMENTS) > somevalue
 GROUP 
    BY V.VENDORNUMBER, V.VENDORTYPE, V.VENDORNAME

Answer 1

很多人在NHibernate中找不到这个解决方案，然后我用一些简单的技巧来实现我的结果，直到NHibernate修复它才能解决这个问题。

在获得删除条件并执行简单查询后，它看起来像这样。

var reportModels =
            Session.QueryOver<Vendor>(() => v)
    .Where(conjunction)
    .SelectList(list => list
                    .SelectGroup(() => v.Number).WithAlias(() => vModel.VendorNumber)
                    .SelectGroup(() => vtypeCode.Code).WithAlias(() => vModel.VendorType)
                    .SelectGroup(() => v.Name).WithAlias(() => vModel.VendorName))
             .TransformUsing(Transformers.AliasToBean<VendorAnalysisReportModel>())
             .List<VendorAnalysisReportModel>();

var vlst2 =
                    (from vendrs in reportModels orderby vendrs.VendorName ascending select vendrs)
                        .ToList<VendorAnalysisReportModel>().AsQueryable();

然后你可以在任何字段上放置任意数量的where子句。

vlst2 = vlst2.Where(p => p.OutstandingComm > Convert.ToDecimal(toDateComAmount.Value));

vlst2 = vlst2.Where(p => p.ToDateOrders < Convert.ToDecimal(toDateOrdAmount.Value));

我的问题已经解决，复杂的报告已成功运行，我们也在其他查询中也遵循相同的说法。

QF

NHibernate - QueryOver标准出现在Where而不是Having子句中，错误

1 个答案: