The T-SQL statement is below, essentially I want to return a boolean computed field xmlHasValue
SELECT TOP 10
hrd.pkID
, etc= "etc..."
, xmlHasValue = CASE WHEN hdr.someVeryLongXml IS NULL THEN 0 ELSE 1 END
FROM MyLeftTable hdr
inner JOIN MyRightTable lines ON hdr.pkID = lines.fkID
WHERE hdr.SomeField == 123
ORDER BY hdr.pkID DESC
How can I write this in EntityFramework (Full Fx, not dotnet-core), such that EF produces the Case statement as above?
My attempt:
var query = from hdr in dbCtx.MyLeftTable
join lines in dbCtx.MyRightTable on hdr.pkID equals lines.fkID
where hdr.SomeField == 123
orderby hdr.pkID descending
select new //select into anon C# obj
{
pkID = hdr.pkID,
etc = "etc...",
xmlHasValue = hdr.someVeryLongXml //<== ??? stuck here ???
};
var anonObjList = query.AsNoTracking()
.Take(10)
.ToList(); //exec qry on the SERVER, and fill the anon object.
Related
I need to count how many records in the tableA are not in the tableA, how to do this with LINQ?
with SQL I do the following way
select count(*) as total from produtoitemgrade g
where g.id not in (select idprodutograde from produtoestoque where idProduto = 12)
and g.idProduto = 12
my linq code so far.
var temp = (from a in Produtoitemgrades
join b in Produtoestoques on a.IdUnico equals b.IdUnicoGrade into g1
where g1.Count(y => y.IdProduto == 12)>0 && !g1.Any()
select a).ToList();
I tried to follow that example LINQ get rows from a table that don't exist in another table when using group by?
but an error occurs when running, how can I do this?
Thanks!
Your query should looks like the following, if you want to have the same SQL execution plan:
var query =
from a in Produtoitemgrades
where !Produtoestoques.Where(b => a.IdUnico == b.IdUnicoGrade && b.idProduto == 12).Any()
&& a.idProduto == 12
select a;
var result = query.Count();
I have the following query:
var newsItems = tree.SelectNodes()
.Types(pageTypesArray)
.Path(path)
.OrderBy(orderBy)
.CombineWithDefaultCulture(false)
.Page(page, count)
.OnCurrentSite()
.NestingLevel(-1)
.Culture(CurrentDocument.DocumentCulture)
.InCategories(categories)
.TopN(topN)
.Where("ListableDocumentImage is not null AND ListableDocumentImage != ''")
.Columns(columns);
Which translates like so:
WITH AllData AS
(
SELECT TOP 6 * for brevity, ROW_NUMBER() OVER (ORDER BY [NewsOccurrenceDate] DESC) AS [CMS_RN]
FROM View_CMS_Tree_Joined AS V WITH (NOLOCK, NOEXPAND) INNER JOIN SOS_News AS C WITH (NOLOCK) ON [V].[DocumentForeignKeyValue] =
[C].[NewsID] AND V.ClassName = N'News' LEFT OUTER JOIN COM_SKU AS S WITH (NOLOCK) ON [V].[NodeSKUID] = [S].[SKUID]
WHERE [NodeSiteID] = #NodeSiteID AND (([DocumentCanBePublished] = 1 AND ([DocumentPublishFrom] IS NULL OR [DocumentPublishFrom] <= #Now)
AND ([DocumentPublishTo] IS NULL OR [DocumentPublishTo] >= #Now))
AND [NodeAliasPath] LIKE #NodeAliasPath AND [DocumentCulture] = #DocumentCulture
**AND 0 = 1)** <<<------------------- WHERE DID THIS COME FROM?????
)
SELECT *, (SELECT COUNT(*) FROM AllData) AS [CMS_TOT]
FROM AllData
WHERE CMS_RN BETWEEN 4 AND 6
ORDER BY CMS_RN
Has anyone ever come across anything like this before? I can't figure out why they're sticking in the AND 0=1 in my where clause.
Properly structuring your document API call will help with this. In your query results, you can see your WHERE condition is not even being added so it does make a difference the order of the methods being called.
For instance:
var newsItems = tree.SelectNodes()
.Types(pageTypesArray)
.Path(path)
.Where("ListableDocumentImage is not null AND ListableDocumentImage != ''")
.TopN(topN)
.OrderBy(orderBy)
.CombineWithDefaultCulture(false)
.Page(page, count)
.NestingLevel(-1)
.Culture(CurrentDocument.DocumentCulture)
.InCategories(categories)
.OnCurrentSite()
.Columns(columns);
Im using Linqpad to test out my EF query and I cant seem to get my end result to include a few extra columns that represent sums of a field based on different conditions
StorePaymentInvoices table contains a FK over to CustomerStatementBatchPayments. So I need to sum the CustomerStatementBatchPayment.net field if there is a corresponding value in StorePaymentInvoices
Getting the sums is turning out to be a real mess. Any suggestions?
Sometimes what is hard to do in one statement, ends up being easier done in multiple steps.
var retval = (
from a in CustomerStatementBatches
join b in CustomerStatementBatchPayments on a.ID equals b.CustomerStatementBatchID into grp1
from c in grp1
where a.CustomerStatementID == StatementId
group c by c.CustomerStatementBatchID into grp2
from e in grp2
select new {
StatementId = e.CustomerStatementBatch.CustomerStatementID,
BatchId = e.CustomerStatementBatchID,
Applied = CustomerStatementBatchPayments.Where(csbp => !StorePaymentInvoices.Select (pi => pi.CustomerStatementBatchPaymentID ).ToList().Contains(e.ID)).Sum (csbp => csbp.Net )
}
).ToList();
retval.Dump();
[ UPDATE 1]
This is what Ive done to get the "conditional" sum values and I seem to be getting the correct numbers. The resulting SQL that it generates is kinda ugly, but executes in < 1 second.
var retval1 = (
from a in CustomerStatementBatches
join b in CustomerStatementBatchPayments on a.ID equals b.CustomerStatementBatchID into grp1
from c in grp1
where a.CustomerStatementID == StatementId
group c by new { a.CustomerStatementID, c.CustomerStatementBatchID} into grp2
from e in grp2.Distinct()
select new {
StatementId = e.CustomerStatementBatch.CustomerStatementID,
BatchId = e.CustomerStatementBatchID
}
).ToList()
.Distinct()
.Select(a => new
{
StatementId = a.StatementId,
BatchId = a.BatchId,
AppliedTotal = (from b in CustomerStatementBatchPayments.Where(r => r.CustomerStatementBatchID == a.BatchId)
join c in StorePaymentInvoices on b.ID equals c.CustomerStatementBatchPaymentID
group b by b.CustomerStatementBatchID into g1
from d in g1
select new{ Total = (decimal?)d.Net}).DefaultIfEmpty().Sum (at => (decimal?)at.Total ) ?? 0.0m,
Unappliedtotal = (from b in CustomerStatementBatchPayments.Where(r => r.CustomerStatementBatchID == a.BatchId)
.Where(s => !StorePaymentInvoices.Any (pi => pi.CustomerStatementBatchPaymentID == s.ID ) )
select new{ Total = (decimal?)b.Net}).DefaultIfEmpty().Sum (at => (decimal?)at.Total ) ?? 0.0m
})
.ToList();
Try this
from a in db.CustomerStatementBatches
join b in db.CustomerStatementBatchPayments
//.Where(i => ...)
.GroupBy(i => i.CustomerStatementBatchesId)
.Select(i => new {
CustomerStatementBatchesId = i.Key,
SumOfPayments = i.Sum(t => t.Net)
}
)
into tmp from b in tmp.DefaultIfEmpty()
on a.CustomerStatementBatchesId equals b.CustomerStatementBatchesId
select new
{
StatementId = a.CustomerStatementId,
BatchId = a.CustomerStatementBatchId,
Applied = ((b == null) ? 0 : b.SumOfPayments)
}
i want to count null values in JPQL but count (case when "column" is null then.. end) doesn't work it work only on MYSQL ,i don't want to use count(*) what is the solution ??
String jpql ="select c.commande.user.login ,count(CASE WHEN c.commande.commandeTms is Null THEN 1 else 0 END) AS count1 from Designation c GROUP BY c.commande.user.login";
here my database
Here you go : I have used CriteriaBuilder to count them ... as a result, you get a List of Tuple containing the user login and count elements ... you may want to change names and "count cases" according to your needs :
public List<Tuple> test() {
CriteriaBuilder cb = entityManager.getCriteriaBuilder();
CriteriaQuery<Tuple> cq = cb.createQuery(Tuple.class);
Root<Designation> designation = cq.from(Designation.class);
Join<Designation, Commande> commande = designation.join("commande");
Join<Commande, User> user = commande.join("user");
Expression expr = commande.get("commandeTms");
cq.multiselect(user.get("login").alias("login"),
cb.sum(cb.<Long>selectCase().when(expr.isNotNull(), 1L).otherwise(0L)).alias("NotNull"),
cb.sum(cb.<Long>selectCase().when(expr.isNull(), 1L).otherwise(0L)).alias("Null"));
cq.groupBy(user.get("login"));
Query query = entityManager.createQuery(cq);
return query.getResultList();
}
You can use SUM aggregate function for this case
String jpql ="SELECT c.commande.user.login, SUM(CASE WHEN c.commande.commandeTms IS NULL THEN 1 ELSE 0 END) AS count1 FROM Designation c GROUP BY c.commande.user.login";
Please anyone can help me to write this sql query into Linq.
select
P.ID,
P.Name,
Set_selected=
case when exists(
select C.ClassifierID
from dbo.ProductClassifiers C
where C.ProductID=130 and C.ClassifierID=P.ID)
then 'Yes' else 'No' end
from dbo.Classifier P
var retVal = (from s in dataContext.ProductClassifiers
join k in dataContext.Classifier
on s.ClassifierId equals k.Id
where s.ProductId == 30
select new {write here what values you want to get like s.Id,k.Name etc}).ToList();
Here's an attempt:
var query = from p in dataContext.Classifiers
select new {
p.ID,
p.Name,
p.Selected = dataContext.ProductClassifiers
.Where(c => c.ProductID == 130 &&
c.ClassifierID == p.ID)
.Any()
};
(That will make the Selected property Boolean rather than Yes/No, but that's usually going to be easier to work with.)
You should look at what the translated SQL looks like though, and in particular what the query plan is like compared with your original.
Untested, but hopefully works:
var q = classifier.Select(
p => new {
p.ID,
p.Name,
Set_selected = productClassifiers
.Select(c => c.ProductID == 130 && c.ClassifierID == p.ID)
.Any() ? "Yes" : "No"
}
);
The code assumes that you have two IEnumerable<T> representing the Classifier and ProductClassifiers tables.