I have a list<> of phone numbers and I am trying to join that with the corresponding records in the db table and get an order number and a customer ID. Also the list has the whole number as one string and the DB has it broken to area code, prefix, number each as separate fields.
I am fairly new to LINQ, so this is a beyond what I currently know. Any suggestions are GREATLY appreciated.
var tnbrs = new List<string>();
have tried:
var tntable = tnbrs.Cast<DataSet>();
var tntable = tnbrs.AsQueryble();<code>
var custdata = from c in db.CUSTs
join t in tntable on c.NPA + c.NXX + c.LINE_NBR equals t.???
select new { c.PON, c.PartnerID };
You dont have to cast tnbrs to dataset
try this instead
var custdata = from c in db.CUSTs
where tnbrs.Contains(c.NPA + c.NXX + c.LINE_NBR)
select new { c.PON, c.PartnerID };
It generates sql query something like this
SELECT [t0].[PON], [t0].[PartnerID]
FROM [dbo].[CUSTs ] AS [t0]
WHERE [t0].[NPA]) + [t0].[Nxx] + [t0].[LINE_NBR] IN (#p0, #p1)
Related
I have a query wherein I need to get the count from 2 different tables. Here is a very simple form of the query (my query has more joins and conditions but this is the part I am stuck on):
select (select count(1) from Table1) as One, (select count(1) from Table2) as Two
The following linq queries works but I would like to do the above with a single linq query sent to the SQL Server. This query and many other versions I have tried, result in 2 queries sent to the server:
var query1 = from m in this.Table1 select m;
var query2 = from sr in this.Table2 select sr;
var final = new { One = query1.Count(), Two = query2.Count() };
I also tried this and this also sends 2 queries:
var final = from dummy in new List<int> { 1 }
join one in query1 on 1 equals 1 into ones
join two in query2 on 1 equals 1 into twos
select new { One = ones.Count(), Two = twos.Count()};
You need to make it a single LINQ query that can be translated:
var final = (from m in this.Table1.DefaultIfEmpty()
select new {
One = (from m in this.Table1 select m).Count(),
Two = (from sr in this.Table2 select sr).Count()
}).First();
Note that putting the sub-queries into an IQueryable variable will cause three separate queries to be sent.
Alternatively, since Count() doesn't have a query syntax equivalent, this is a little more compact in lambda syntax:
var final = this.Table1.DefaultIfEmpty().Select(t => new {
One = this.Table1.Count(),
Two = this.Table2.Count()
}).First();
I looked at some of the other related questions, but didn't find a good answer. My TSQL query works fine:
SELECT POR.ReqNum ,
POR.ReqLine ,
XF.* -- Expand this..
FROM E10DB.Erp.PORel POR
INNER JOIN E10DB.Erp.ReqDetail RD ON RD.ReqNum = POR.ReqNum
INNER JOIN E10DB.Ice.XFileAttch XF ON XF.Key1 = CONVERT(NVARCHAR(50),
RD.ReqNum)
WHERE POR.PONum = #ponum
AND RD.Company = #company
AND XF.Company = #company;
I would like to translate this into a LINQ result like:
var joinResultRows = from PORel , etc.,...........
so I can do loop through them to do something :
foreach(var joinResult in joinResultRows)
{
string custID = joinResult.CustID;
string ponum = joinResult.PONum;
}
Any thoughts? Thanks!
So I have two DataTables that have the same schema, but different data. I want to join the two tables together where two fields, id3 and print and the same. How would I write this in LINQ?
Right now, this works and gives no compiler errors:
var singOneJoin =
from prod in singOneProd.Table.AsEnumerable()
join agg in singOneAgg.Table.AsEnumerable()
on prod.Field<string>("print") equals agg.Field<string>("print")
select new
{
print = prod.Field<string>("print")
};
But what I really want is this:
var singOneJoin =
from prod in singOneProd.Table.AsEnumerable()
join agg in singOneAgg.Table.AsEnumerable()
on (prod.Field<string>("print") equals agg.Field<string>("print") &&
prod.Field<Int32>("id3") equals agg.Field<Int32><("id3"))
select new
{
print = prod.Field<string>("print")
};
But this gives me compiler errors.
How do I join these two tables together on both the print and the id3 columns?
Regards,
Kyle
Use anonymous objects to join on multiple fields:
var singOneJoin =
from prod in singOneProd.Table.AsEnumerable()
join agg in singOneAgg.Table.AsEnumerable()
on new {
Print = prod.Field<string>("print"),
Id3 = prod.Field<Int32>("id3")
} equals new {
Print = agg.Field<string>("print"),
Id3 = agg.Field<Int32>("id3")
}
select new {
print = prod.Field<string>("print")
};
Keep in mind that anonymous object property names should match.
I want to convert the following SQL code into linq to sql but can't seem to find a way
select holder_name,agent_code,sum(total)
from agent_commission
group by agent_code
Can anyone help me? Am kinda stuck with this for quite a while.
Thanks in advance
UPDATE:
I tried the following
var query = (from p in context.Agent_Commissions
group p by new
{
p.agent_code
}
into s
select new
{
amount = s.Sum(q => q.total),
}
);
How do I select the other two columns? What am I missing?
In fact your SQL query works only when the corresponding relationship between holder_name and agent_code is 1-1, otherwise the Group by agent_code won't work. So your linq query should be like this:
var query = from p in context.Agent_Commissions
group p by p.agent_code into s
select new {
holder_name = s.FirstOrDefault().holder_name,
agent_code = s.Key,
amount = s.Sum(q => q.total)
};
Here is your linq query
from a in ctx.agent_code
group a by a.holder_name, a.code into totals
select { holder_name = a.holder_name,
code = a.code,
total = totals.Sum(t=>t.total)}
Given that you have linq2sql context in ctx variable and it has your table in it.
I am using a linq query to obtain a table of customers with their total money amount for each monetary unit exist in my database(this one is ok.)
when show the result of my query with Microsoft Report Viewer the result is like Table 1 but what i want is Table 2, only the customer name like "A" and a cell with all the monetory unit records > 0.
Is there any way you can suggest?
This is my code which produces Table 1:
var query = from kur in kurToplamlist
join cariBilg in db.TBLP1CARIs
on kur.CariIdGetSet equals cariBilg.ID
select new
{
cariBilg.ID,//customerid
EUROBAKIYE = cariBilg.HESAPADI,
cariBilg.K_FIRMAADI,//other column names
cariBilg.K_YETKILIADI,//other column names
cariBilg.K_FIRMATELEFON,//other column names
cariBilg.K_YETKILITELEFON,//other column names
AUDBAKIYE = cariBilg.B_CEPTELEFON,//other column names
MonetaryUnit = String.Concat(kur.KurToplamMiktarGetSet.ToString(), kur.DovizTuruGetSet.ToString()),//concatenates "100" and "TL/USD etc."
};
What i want is to obtain Table 2 in the image
Thank you in advance.
Table image
var query = from kur in kurToplamlist
where kur.KurToplamMiktarGetSet > 0
join cariBilg in db.TBLP1CARIs
on kur.CariIdGetSet equals cariBilg.ID
select new
{
cariBilg.ID,
EUROBAKIYE = cariBilg.HESAPADI,
cariBilg.K_FIRMAADI,
cariBilg.K_YETKILIADI,
cariBilg.K_FIRMATELEFON,
cariBilg.K_YETKILITELEFON,
AUDBAKIYE = cariBilg.B_CEPTELEFON,
TLBAKIYE = String.Concat(kur.KurToplamMiktarGetSet.ToString(), kur.DovizTuruGetSet.ToString()),
};
var dfg = from qre in query
select qre.TLBAKIYE;
var aq = (from qw in query
select new {
qw.ID,
EUROBAKIYE = qw.EUROBAKIYE,
qw.K_FIRMAADI,
qw.K_YETKILIADI,
qw.K_FIRMATELEFON,
qw.K_YETKILITELEFON,
AUDBAKIYE = qw.AUDBAKIYE,
TLBAKIYE = String.Join(",", (from qre in query
where qre.ID == qw.ID
select qre.TLBAKIYE).Distinct())
}).Distinct();
return aq;
This is my answer.