I have a search request as below:
var response = client.Search<ProductElastic>(s => s
.Query(q => q
.Bool(b => b
.Should(mu => mu
.Match(m => m
.Field(f => f.title)
.Boost(1.5)
.Query(inputfilter.q)
), mu => mu
.Match(m => m
.Field(f => f.content)
.Query(inputfilter.q)
)
)
)
)
.Aggregations(a => a
.Terms("doctype_i", he => he
.Field(g => g.doctype_i)
)
.Terms("category_i", e => e
.Field(ge => ge.category_i)
.Size(100)
)
)
);
inputfilter.q holds the search term. When inputfilter.q is null it returns all the results and my aggregation bucket numbers are accurately represented. When inputfilter.q is defined (ex. searching for "test") it refines the results set, however, my aggregation buckets still give me the full numbers as before, as if nothing was searched for. For the record, doctype_i and category_i are integer type fields in Elastic.
How do I make my .Aggregations acknowledge the .Query so the aggregation buckets reflect numbers based on the results set?
Related
I have a problem with translating this SQL into QueryOver notation. Can you help me?
SELECT * FROM Alerts a
WHERE a.CreatedOn = (
SELECT MAX(b.CreatedOn) FROM Alerts b WHERE b.UserFk=a.UserFk);
I try to select last alert for every user. I use CreatedOn and cannot use Id.
I have so far:
session.QueryOver(() => alertAlias)
.SelectList(list => list
.Select(() => alertAlias.User.Id)
.SelectSubQuery(
QueryOver.Of<Alerts>()
.Where(x => x.User.Id == alertAlias.User.Id)
.OrderBy(x => x.CreatedOn).Desc
.Select(x => x.CreatedOn)
.Take(1)));
I know it adds user's last alert date to every user's alert row. But I want to have only last alerts.
Your attempt is using subquery inside of a SELECT statement. But we need to move it into WHERE. This should be the way:
// this is a subquery (SELECT ....
var subquery = QueryOver.Of<Alerts>()
.Where(x => x.User.Id == alertAlias.User.Id)
.OrderBy(x => x.CreatedOn).Desc
.Select(x => x.CreatedOn)
.Take(1)));
// main Query could now have or do not have that subquery selected
var query = session.QueryOver(() => alertAlias)
.SelectList(list => list
.Select(() => alertAlias.User.Id)
// could be there
.SelectSubQuery(subquery)
)
// but mostly here we do use WHERE clause
.WithSubquery
.WhereProperty(() => alertAlias.CreatedOn)
.Eq(subquery)
;
// such a query could be returned as a list of arrays
var results = query.List<object[]>();
We can also use some Result Transformer, but this is another story...
I have some QueryOver with several joins and the result I get is OK in terms of the returned objects. This is the code>
var l = session.QueryOver<Discount>(() => discount)
.JoinQueryOver<ConPrdGrp>(r => r.ConPrdGrps)
.JoinQueryOver<PrdGroupTree>(k => k.PrdGroupTree)
.JoinQueryOver<Product>(g => g.Products)
.Where(p => p.ProductID == Product.ProductID)
.And(() => discount.FomDato <= DateTime.Now && discount.TomDato >= DateTime.Now).List();
But if I look at the SQL statement, I can see that the generated query selects ALL columns from all joined tables although the result only returns a list of Discount objects. I can get some properties of Discount using projections and the query will be much smaller. But how I can instruct NHibernate to get just columns from the Discount table and not from all joined tables?
As far as I know there is NOT a simple way like: .Select(Projections.Properties<Discount>()). Check this a bit outdated question (NHIbernate: Shortcut for projecting all properties?)
What you can do is explicitly name the columns you would like to see:
... // the QueryOver you have
.SelectList (l => l
.Select(() => discount.ID).WithAlias(() => discount.ID)
.Select(() => discount.Code).WithAlias(() => discount.Code)
...
)
.TransformUsing(Transformers.AliasToBean<Discount>())
...
The second approach could be to create the Subquery, and then just QueryOver<Discount>() 16.8. Subqueries
QueryOver<Discount> subQuery =
QueryOver.Of<Discount>(() => innerDiscount)
.JoinQueryOver<ConPrdGrp>(r => r.ConPrdGrps)
.JoinQueryOver<PrdGroupTree>(k => k.PrdGroupTree)
.JoinQueryOver<Product>(g => g.Products)
.Where(p => p.ProductID == Product.ProductID)
.And(() => innerDiscount.FomDato <= DateTime.Now
&& innerDiscount.TomDato >= DateTime.Now).List()
.Select( Projections.Property(() => innerDiscount.ID))
;
var query = session.QueryOver<Discount>(() => discount)
.Where(Subqueries.PropertyIn("ID", subQuery.DetachedCriteria))
;
I'm in the process of learning Fluent nHibernate. I'm having trouble with building a query thats not quite the same as the classic examples I've found online. Typically I've found this example:
IQueryOver<Cat,Cat> catQuery =
session.QueryOver<Cat>(() => catAlias)
.JoinAlias(() => catAlias.Kittens, () => kittenAlias)
.Where(() => catAlias.Age > 5)
.And(() => kittenAlias.Name == "Tiddles");
So from what I understand in this example a Cat object is being returned after being joined on Kittens and then filtered using the kittens name and the cat's age. And the join works because the Cat object has a property called Kittens.
An example of what I'm trying to do would look like this:
Forest f = null;
Tree t = null;
ForestsFound = session.QueryOver<Forest>(() => f)
.JoinAlias(() => t.Forest, () => f)
.Where(() => t.NumberOfTrees > 1000)
.List<Forest>()
.ToList<Forest>();
A forest is essentially a lookup table, it's the Tree that has a link to what forest the tree is in but I want to return a distinct list of forests. So in regular sql it would look like:
select f.*
from Forest f
inner join Tree t
on t.Forest_id = f.ID
where t.NumberOfTrees > 1000
If you have a relationship from Forest -> Trees then you can do this:
Forest f = null;
Tree t = null;
ForestsFound = session.QueryOver<Forest>(() => f)
.JoinAlias(() => f.Trees, () => t)
.Where(() => t.NumberOfTrees > 1000)
.List<Forest>();
BACKGROUND:
Given 3 tables
results contains 2 columns vId and pId
vTable contains 2 columns vId and data
pTable contains 2 columns pId and data
I want to accomplish this sort of SQL query using QueryOver
SELECT v.data, p.data
from results r
inner join vTable v on r.vId = v.vId
inner join pTable p on r.pId = p.pId
I've tried the following:
var res = GetResults(some parameters)
.Select(x => x.vId
.Select(x => x.pID);
var dataset = session.QueryOver<vTable>()
.WithSubquery.WhereProperty(v => v.vId).In(res)
.Select(v => v.vId)
.Select(v => v.data)
which works just fine to get data from vTable
however, when I add the 2nd table
var dataset = session.QueryOver<vTable>()
.WithSubquery.WhereProperty(v => v.vId).In(res)
.JoinQueryOver<pTable>(p => p.pId)
.WithSubquery.WhereProperty(p => p.pId).In(res)
.Select(v => v.vId)
.Select(v => v.data)
.Select(p => p.pId)
.Select(p => p.data)
I get the error
Delegate 'System.Func<System.Collections.Generic.IEnumerable<pTable>>' does not take 1 arguments
What am I doing wrong?
.JoinQueryOver<pTable>(p => p.pId)
has to point to a mapped entity or collection not it an id, if you can't map it in the hbm. And also the JoinQueryOver will return pTables not vTables, you might want to use JoinAlias instead if you wan to retain the return type to be a list of vTables, but if all you want is that projection make sure you add aliases the QueryOver and JoinQueryOver calls
I'm writing part of turist blog so I have two entities: place and photo in relation 1 to many, so every place can have multiple photos, but single photo belongs to one place.
My aim is to create summary: last added 3 places and with every place I want to have one photo (for example photo with the lower id, it doesn't matter). It's important to have not only the id of the photo, but more info (columns) like photo label, path to photo,etc.
Using SQL in MS SQL 2008 it can be done by using rank functions:
select top 3 * from
(
SELECT p.id, p.label, p.VisitDate, ph.id AS photo_id, ph.Label, ph.Path,
RANK() OVER (PARTITION BY p.id ORDER BY ph.id) AS _rank
FROM place AS p INNER JOIN
photo AS ph ON p.id = ph.place_id
) ranked
where _rank = 1
order by VisitDate desc
Or it can be resolved without ranking:
SELECT TOP (3) a.id AS ida, z.id AS idz, z.etykieta, z.sciezka, a.data_odwiedzenia
FROM place AS a INNER JOIN
photo AS z ON a.id = z.id_atrakcji
and z.id in
(
SELECT min(z.id) AS idz
FROM photo z
where z.id_atrakcji in (select top 3 a.id from place a order by a.data_dodania desc)
group by z.id_atrakcji
)
ORDER BY a.data_odwiedzenia DESC
I started writing this query without ranking, but I've stucked.
summaryList =
session.QueryOver(() => placeAlias)
.JoinAlias(o => o.Photos, () => photoAlias)
.SelectList(list => list
.Select(() => placeAlias.Id).WithAlias(() => summaryAlias.PlaceId)
.Select(() => placeAlias.Etykieta).WithAlias(() => summaryAlias.PlaceName)
.Select(() => photoAlias.Etykieta).WithAlias(() => summaryAlias.PhotoLabel)
.Select(() => photoAlias.Id).WithAlias(() => summaryAlias.PhotoId)
)
.OrderByAlias(() => placeAlias.VisitDate).Desc
.WithSubquery.WhereProperty(x => x.Id).In(lastPlaces)
.TransformUsing(Transformers.AliasToBean<PlacesSummary>())
.List<PlacesSummary>();
Can you help me with this? How to write lastPlaces queryover or maybe there's another approach?
Regards,
Macko
var subquery = QueryOver.Of(() => photoAlias)
.Where(photo => photo.Place.Id == placeAlias.Id)
.Select(Projections.Max<Photo>(photo => photo.Id));
var summaryList = session.QueryOver(() => placeAlias)
.OrderBy(() => placeAlias.VisitDate).Desc
.JoinQueryOver(() => placeAlias.Photos, () => photoAlias)
.WithSubquery.WhereProperty(photo => photo.Id).Eq(subquery)
.SelectList(list => list
.Select(() => placeAlias.Id).WithAlias(() => summaryAlias.PlaceId)
.Select(() => placeAlias.Etykieta).WithAlias(() => summaryAlias.PlaceName)
.Select(() => photoAlias.Etykieta).WithAlias(() => summaryAlias.PhotoLabel)
.Select(() => photoAlias.Id).WithAlias(() => summaryAlias.PhotoId)
)
.TransformUsing(Transformers.AliasToBean<PlacesSummary>())
.List<PlacesSummary>();
cant test it right now
it doesn't work as it should but you it is very close:
summaryList =
session.QueryOver(() => placeAlias)
.OrderByAlias(() => placeAlias.VisitDate).Desc
.JoinAlias(o => o.Photos, () => photoAlias)
**.WithSubquery.WhereProperty(()=> photoAlias.Id).Eq(subquery)**
.SelectList(list => list
.Select(() => placeAlias.Id).WithAlias(() => summaryAlias.PlaceId)
.Select(() => placeAlias.Etykieta).WithAlias(() => summaryAlias.PlaceName)
.Select(() => photoAlias.Etykieta).WithAlias(() => summaryAlias.PhotoLabel)
.Select(() => photoAlias.Id).WithAlias(() => summaryAlias.PhotoId))
.TransformUsing(Transformers.AliasToBean<PlacesSummary>())
.Take(3)
.List<PlacesSummary>();
It differs in only one line .WithSubquery where orginally it refers to Place instead it should refer to Photo. Now it's working and it produces following SQL:
SELECT TOP (3) this_.id as y0_, this_.PlaceName as y1_, photoalias1_.PhotoName as y2_, photoalias1_.id as y3_
FROM [place] this_ inner join [photo] photoalias1_ on this_.id=photoalias1_.id_place
WHERE photoalias1_.id = (SELECT min(this_0_.id) as y0_ FROM [photo] this_0_ WHERE this_0_.id_place = this_.id)
ORDER BY this_.DateVisit desc
It's working great but I have another question:
How to rewrite in QueryOver such SQL:
SELECT min(id)
FROM photo
where id in (... it doesn't matter what's here ...)
group by place_id
So I want only list of photo ids (only column) and this query will be used as subquery in another queryover. Can it be done by QueryOver syntax?