ToRowCountQuery 似乎忽略分组 [英] ToRowCountQuery seems to ignore groupings

问题描述

我正在尝试从常规查询创建行计数查询，但生成的 SQL 似乎缺少 GROUP BY，从而导致计数错误.有谁知道我做错了什么.

I'm trying to create a rowcount-query from a regular query, but the resulting SQL seems to lack the GROUP BY resulting in a wrong count. Does anyone know what I'm doing wrong.

首先是查询:

var query = Session.QueryOver<InkoopFactuurListItem>()
    .Where(i => i.KlantId == Klant.Id)
    .AndRestrictionOn(i => i.Status).IsIn(statussen)
    .SelectList(list => list
        .SelectGroup(h => h.Id).WithAlias(() => dto.Id)
        .SelectGroup(h => h.Banknummer).WithAlias(() => dto.Banknummer)
        .SelectGroup(h => h.CrediteurNaam).WithAlias(() => dto.CrediteurNaam)
        .SelectGroup(h => h.DienstType).WithAlias(() => dto.DienstType)
        .SelectGroup(h => h.DocumentId).WithAlias(() => dto.DocumentId)
        .SelectGroup(h => h.DocumentNaam).WithAlias(() => dto.DocumentNaam)
        .SelectGroup(h => h.Factuurbedrag).WithAlias(() => dto.Factuurbedrag)
        .SelectGroup(h => h.Klantnummer).WithAlias(() => dto.Klantnummer)
        .SelectGroup(h => h.Factuurbtw).WithAlias(() => dto.Factuurbtw)
        .SelectGroup(h => h.FactuurDatum).WithAlias(() => dto.FactuurDatum)
        .SelectGroup(h => h.Factuurnummer).WithAlias(() => dto.Factuurnummer)
        .SelectGroup(h => h.IMSNummer).WithAlias(() => dto.IMSNummer)
        .SelectGroup(h => h.KlantId).WithAlias(() => dto.KlantId)
        .SelectGroup(h => h.Soortfactuur).WithAlias(() => dto.Soortfactuur)
        .SelectGroup(h => h.Status).WithAlias(() => dto.Status)
        .SelectGroup(h => h.VerwerktOp).WithAlias(() => dto.VerwerktOp)
        .SelectMin(h => h.Van).WithAlias(() => dto.Van)
        .SelectMax(h => h.Tot).WithAlias(() => dto.Tot))
    .TransformUsing(Transformers.AliasToBean<InkoopFactuurListItem>());

var rowcount = query.ToRowCountQuery().FutureValue<int>();

IEnumerable<InkoopFactuurListItem> results;
if (command.Page > 0 && command.PageSize > 0)
{
    results = query
        .Skip((command.Page - 1) * command.PageSize)
        .Take(command.PageSize).Future<InkoopFactuurListItem>();
}
else
{
    results = query
        .Take(command.PageSize)
        .Future<InkoopFactuurListItem>();
}

count = rowcount.Value;

结果 SQL:

SELECT count(*) as y0_ 
FROM vwInkoopFactuurListItem this_ 
WHERE this_.KlantId = @p0 and this_.Status in (@p1, @p2, @p3, @p4, @p5);

SELECT TOP (@p6) y0_, y1_, y2_, y3_, y4_, y5_, y6_, y7_, y8_, y9_, y10_, y11_, y12_, y13_, y14_, y15_, y16_, y17_ 
FROM (
    SELECT this_.InkoopFactuurId as y0_, this_.Banknummer as y1_, this_.CrediteurNaam as y2_, this_.DienstType as y3_, this_.DocumentId as y4_, this_.DocumentNaam as y5_, this_.Factuurbedrag as y6_, this_.Klantnummer as y7_, this_.Factuurbtw as y8_, this_.FactuurDatum as y9_, this_.Factuurnummer as y10_, this_.IMSNummer as y11_, this_.KlantId as y12_, this_.Soortfactuur as y13_, this_.Status as y14_, this_.VerwerktOp as y15_, min(this_.Van) as y16_, max(this_.Tot) as y17_,
    ROW_NUMBER() OVER(ORDER BY CURRENT_TIMESTAMP) as __hibernate_sort_row
    FROM vwInkoopFactuurListItem this_
    WHERE this_.KlantId = @p8 and this_.Status in (@p9, @p10, @p11, @p12, @p13)
    GROUP BY this_.InkoopFactuurId, this_.Banknummer, this_.CrediteurNaam, this_.DienstType, this_.DocumentId, this_.DocumentNaam, this_.Factuurbedrag, this_.Klantnummer, this_.Factuurbtw, this_.FactuurDatum, this_.Factuurnummer, this_.IMSNummer, this_.KlantId, this_.Soortfactuur, this_.Status, this_.VerwerktOp
) as query 
WHERE query.__hibernate_sort_row > @p7
ORDER BY query.__hibernate_sort_row; ;@p0 = 1 [Type: Int64 (0)], @p1 = 'OverigMatchingInkoop' [Type: String (255)], @p2 = 'OverigMatchingVerkoop' [Type: String (255)], @p3 = 'Overig' [Type: String (255)], @p4 = 'Geboekt' [Type: String (255)], @p5 = 'Geexporteerd' [Type: String (255)], @p6 = 10 [Type: Int32 (0)], @p7 = 284590 [Type: Int32 (0)], @p8 = 1 [Type: Int64 (0)], @p9 = 'OverigMatchingInkoop' [Type: String (255)], @p10 = 'OverigMatchingVerkoop' [Type: String (255)], @p11 = 'Overig' [Type: String (255)], @p12 = 'Geboekt' [Type: String (255)], @p13 = 'Geexporteerd' [Type: String (255)]

那么行计数查询中的 GROUP BY 在哪里?

So where is the GROUP BY in the rowcount-query?

更新事实证明，ToRowCountQuery 从原始查询中去除了选择和分组.那么我该如何做这样的事情:

UPDATE As it turns out, ToRowCountQuery strips the selection and groupings from the original query. So how can I do something like this:

select count(*)
from (... query ...)

Firo 的答案似乎是朝着正确方向迈出的一步，但我不能使用 CountDistinct，因为我需要对所有字段进行计数，包括选择列表中显示的最小/最大字段.除此之外，CountDistinct 不会将 IProjection 作为参数:

The answer by Firo seems to be a step in the right direction, but I cannot use CountDistinct as I need the count over all fields, including the min/max fields as shown in the selectlist. Next to that, CountDistinct doesn't take an IProjection as argument:

//
// Summary:
//     A distinct property value count
public static CountProjection CountDistinct(Expression<Func<object>> expression);
//
// Summary:
//     A distinct property value count
public static CountProjection CountDistinct<T>(Expression<Func<T, object>> expression);
//
// Summary:
//     A distinct property value count
//
// Parameters:
//   propertyName:
public static CountProjection CountDistinct(string propertyName);

更新 2

根据 Firo 回答中的链接，我想出了这个替代方案.我将 query 修改为一个分离的 QueryOver 对象.接下来，我尝试了这个:

Based on the links in Firo's answer, I came up with this alternative. I modified query to be a detached QueryOver object. Next, I tried this:

var rowcount = Session.QueryOver<InkoopFactuurListItem>()
    .Select(
        Projections.Alias(
            Projections.Count(Projections.SubQuery(detachedQuery)), "count"
        )
    )
    .FutureValue<int>();

然而，这会导致 ArgumentOutOfRangeException:

Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index

推荐答案

已

ToRowCountQuery 删除所有投影甚至分组.如果您自己运行查询，您将看到 count(*) 在带有 group by 的查询中将返回每个组的计数而不是组数.您必须 COUNT DISTINCT 所有组列才能获得组数.

ToRowCountQuery removes all Projections even the groupings. If you run the query yourself you will see that count(*) in a query with group by will return the count of each group not the number of groups. you have to COUNT DISTINCT all group-columns to get the number of groups.

您需要诸如 SELECT count(*) FROM (query) 之类的东西，这是不可能直接实现的.我只能想到一个脆弱的解决方案，您可以在其中生成如图所示的 sql 这里 然后

You need someting like SELECT count(*) FROM (query) which is not directly possible. i can only think of a fragile solution where you generate the sql like shown here and then

string sql = GenerateSQL(query.UnderlyingCriteria);
rowcount = session.CreateSQLQuery(string.Format("SELECT Count(*) FROM ({0})", sql)).SetParameter("???", KlantId).FutureValue<int>();

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