问题
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.
First the queries:
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;
The resulting 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)]
So where is the GROUP BY in the rowcount-query?
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 ...)
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);
UPDATE 2
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>();
However, this results in an ArgumentOutOfRangeException
:
Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
回答1:
Edited:
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.
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>();
来源:https://stackoverflow.com/questions/8012966/torowcountquery-seems-to-ignore-groupings