how to covert to LINQ :
from p in Product
join c in Catalog on c.Id equals p.CatalogId
join m in Manufacturer on m.Id equals p.ManufacturerId
where p.Active == 1
select new { Name = p.Name, CatalogId = p.CatalogId,
ManufacturerId = p.ManufacturerId, CatalogName = c.Name,
ManufacturerName = m.Name };
help!
Don't try to translate the query literally. In LINQ, you don't need to join entities as long as they already have a relationship because LINQ will automatically use the relationship to join the entities:
So assuming your Product has a Catalog property which in turn has Manufacturer property, you can write your LINQ without joins like this:
from p in Product
where p.Active == 1
select new {
Name = p.Name,
CatalogId = p.CatalogId,
ManufacturerId = p.ManufacturerId,
CatalogName = p.Catalog.Name,
ManufacturerName = p.Manufacturer.Name };
The solution is to build a temp result after the first join and use it as the first sequence in the second join
var result = product.Where(p => p.Active == 1), // 1st sequence
.join(catalog, // 2nd sequence
p => p.CatalogId, // selector from 1st sequence
c => c.Id, // selector from 2nd sequence
(p, c) => // take the elements where the selector match
new {ManufacturerId = p.ManufacturerId,
Name = p.Name,
CatalogId = p.CatalogId,
CatalogName = c.Name}) // result is 1st sequence next join
.Join(Manufacturer, // 2nd sequence 2nd join
r => r.ManufacturerId, // selector result 1st join
m => m.Id, // selector 2nd sequence 2nd join
(r, m) => // two elements where the selectors match
new {Name = r.Name, // build the result object
CatalogId = r.CatalogId,
ManufacturerId = r.ManufacturerId,
CatalogName = r.CatalogName,
ManumfacturerName = r.Name});
Piece of cake ^^
Just call ToString() method of IQueryable will return SQL Representation.
var query = from p in Product
join c in Catalog on c.Id equals p.CatalogId
join m in Manufacturer on m.Id equals p.ManufacturerId
where p.Active == 1;
string sqlQuery = query.ToString(); //SQL Query Saved Here
Related
I have 3 simple tables
tblQual (ID, QualName)
tblPerson (ID, PersonName)
tblPersonQual (ID, PersonID, QualID, ExpiryDate)
I would like to display a matrix with PersonName down the left, QualName at the top and ExpiryDate in the middle. How do I go about doing this?
I've tried this but no joy.
var QualMatrix = from c in db.tblPersonQual
join q in db.tblQual on c.QualID equals q.ID
join p in db.tblPerson on c.PersonID equals p.ID
group c by c.ID into g
select new
{
rowKey = g.Key,
rowData = g.Select(c => new { Qual = q.QualName, Expiry = c.Expiry })
};
In terms of output view something similar to this
As my understanding, you want to display a matrix with QualName, ExpiryDate and QualName. We can use the same query by just modifying group by clause.
var QualMatrix = from c in db.tblPersonQual
join q in db.tblQual on c.QualID equals q.ID
join p in db.tblPerson on c.PersonID equals p.ID
group new { q.QualName,p.PersonName} by new { c.ID,c.ExpiryDate } into g
select new
{
QualName=g.Select(e=>e.QualName).FirstOrDefault(),
ExpirtyDate=g.Key.Expiry,
PersonName=g.Select(e=>e.PersonName).FirstOrDefault(),
};
Hopefully, This will fulfil your requirement.
I'm trying to join two group by queries to get one results set.
var query = from PP in _db.paymentPlans
join APP in _db.Applications on PP.applicationID equals APP.ApplicationId
join C in _db.Courses on APP.courseID equals C.courseID
where PP.active == true && APP.agentID == agentID
orderby C.courseID ascending
group new {C,PP} by new {C.courseID} into totalRecievable
// Query 1
from PD in _db.paymentDetails
join PP in _db.paymentPlans on PD.paymentPlanID equals PP.paymentPlanID
join APP in _db.Applications on PP.applicationID equals APP.ApplicationId
join C in _db.Courses on APP.courseID equals C.courseID
where PP.active == true && APP.agentID == agentID
orderby C.courseID ascending
group new { C,PD } by new { C.courseID, C.cricosCode, C.courseName } into paymentsCourseWise
// Query 2
select new PdPpAppCourseModel
{
courseID = paymentsCourseWise.Key.courseID,
cricosCode = paymentsCourseWise.Key.cricosCode,
courseName = paymentsCourseWise.Key.courseName,
totalAmount = totalRecievable.Sum(x => x.PP.totalAmount),
paidAmount = paymentsCourseWise.Sum(x => x.PD.paidAmount)
}).ToList();
Total about is taken from query 1 as it should group in payment plan(PP) level.
You can only combine enumerations of the same type, you could project both to a common class and then concatenate them:
var result1 = db1.table.Where(a=>a.value>0).Select( x=> new Foo() { //set props });
var result2 = db2.table.Where(a=>a.value>0).Select( x=> new Foo() { //set props });
var resultSum = result1.Concat(result2);
Similarly you can apply this in your code and join this two groups.
I have this sql query that does exactly what i want but i need it in linq. It returns a few AVC rows and counts how many PersonAVCPermission that has status 1 linked to it
SELECT a.Id, a.Name, a.Address, COUNT(p.AVCID) AS Count
FROM AVC AS a
LEFT OUTER JOIN
(
SELECT PersonAVCPermission.AVCId
FROM PersonAVCPermission
WHERE PersonAVCPermission.Status = 1
) AS p
ON a.Id = p.AVCId
GROUP BY a.Id, a.Name, a.Address
I have this query in linq and it does the same thing except when there are no PersonAVCPermission it still counts 1
var yellows = odc.PersonAVCPermissions.Where(o => o.Status == (int)AVCStatus.Yellow);
var q = from a in odc.AVCs
from p in yellows.Where(o => o.AVCId == a.Id).DefaultIfEmpty()
group a by new { a.Id, a.Name, a.Address } into agroup
select new AVCListItem
{
Id = agroup.Key.Id,
Name = agroup.Key.Name,
Address = agroup.Key.Address,
Count = agroup.Count(o => o.Id != null)
};
Im guessing that with DefaultIfEmpty() it places null rows in the list that then gets counted so i try to exclude them with (o => o.Id != null) but it still counts everything as at least one
If i dont use DefaultIfEmpty() it skips the rows with count 0 completely
How can i exclude them or am i doing it completely wrong?
How about using .Any() and a Let?
var yellows = odc.PersonAVCPermissions.Where(o => o.Status == (int)AVCStatus.Yellow);
var q = from a in odc.AVCs
let Y = (from p in yellows.Where(o => o.AVCId == a.Id) select p).Any()
where Y == true
group a by new { a.Id, a.Name, a.Address } into agroup
select new AVCListItem
{
Id = agroup.Key.Id,
Name = agroup.Key.Name,
Address = agroup.Key.Address,
Count = agroup.Count(o => o.Id != null)
};
You don't need the join, nor the grouping:
var q = from a in odc.AVCs
select new AVCListItem
{
Id = a.Id,
Name = a.Name,
Address = a.Address,
Count = yellows.Where(o => o.AVCId == a.Id).Count()
};
I need to write a Linq-Entity state that can get the below SQL query
SELECT RR.OrderId
FROM dbo.TableOne RR
JOIN dbo.TableTwo M ON RR.OrderedProductId = M.ProductID OR RR.SoldProductId= M.ProductID
WHERE RR.StatusID IN ( 1, 4, 5, 6, 7 )
I am stuck with the below syntax
int[] statusIds = new int[] { 1, 4, 5, 6, 7 };
using (Entities context = new Entities())
{
var query = (from RR in context.TableOne
join M in context.TableTwo on new { RR.OrderedProductId, RR.SoldProductId} equals new { M.ProductID }
where RR.CustomerID == CustomerID
&& statusIds.Any(x => x.Equals(RR.StatusID.Value))
select RR.OrderId).ToArray();
}
this gives me below error
Error 50 The type of one of the expressions in the join clause is incorrect. Type inference failed in the call to 'Join'.
How can I do a Multiple condition join for a table.
You don't have to use the join syntax. Adding the predicates in a where clause has the same effect and you can add more conditions:
var query = (from RR in context.TableOne
from M in context.TableTwo
where RR.OrderedProductId == M.ProductID
|| RR.SoldProductId == M.ProductID // Your join
where RR.CustomerID == CustomerID
&& statusIds.Any(x => x.Equals(RR.StatusID.Value))
select RR.OrderId).ToArray();
Change your query syntax from using join to using an additional from clause
var query = (from RR in context.TableOne
from M in context.TableTwo.Where(x => x.ProductID == RR.OrderedProductId || x.ProductID == RR.SoldProductId)
where statusIds.Any(x => x.Equals(RR.StatusID.Value))
select RR.OrderId).ToArray();
Multiple Joins :
var query = (from RR in context.TableOne
join M in context.TableTwo on new { oId = RR.OrderedProductId, sId = RR.SoldProductId} equals new { oId = M.ProductID, sId = M.ProductID }
where RR.CustomerID == CustomerID
&& statusIds.Any(x => x.Equals(RR.StatusID.Value))
select RR.OrderId).ToArray();
I have two queries that I would like to merge. This might be a left outer join, but it seems different.
The first query selects distinct stuff from a table:
var d = from d in db.Data
select (d.ID, d.Label, Value = 0).Distinct;
Lets suppose this returns the following:
{1,"Apple",0}
{2,"Banana",0}
{3,"Cabbage",0}
I then have another query that makes a different selection:
var s = from d in db.Data
where d.Label != "Apple"
select (d.ID, d.Label, d.Value);
This returns:
{2,"Banana",34}
{3,"Cabbage",17}
I then want a third query that joins the d and s together based upon their ID and their Label. I want the result to look like this:
{1,"Apple",0}
{2,"Banana",34}
{3,"Cabbage",17}
I'm basically just updating the numbers in the third query, but I have no idea how I should be doing this. It feels like it should be a simple join, but I just cannot get it to work.
This should work:
var query1 = from d in db.Data
select new { d.ID, d.Label, Value = 0 }.Distinct();
var query2 = from d in db.Data
where d.Label != "Apple"
select new { d.ID, d.Label, d.Value };
var result =
from d1 in query1
join d2 in query2 on new { d1.ID, d1.Label } equals new { d2.ID, d2.Label } into j
from d2 in j.DefaultIfEmpty()
select new
{
d1.ID,
d1.Label,
Value = d2 != null ? d2.Value : d1.Value
};
Note: are you sure you want to join on the ID and the label ? It seems rather strange to me... the label shouldn't be part of the key, so it should always be the same for a given ID
Here is one using method chain, which is my personal favorite.
var one = db.Data.Select(f => new {f.Id, f.Label, Value = 0});
var two = db.Data.Select(f => f).Where(f => f.Label != "Apple");
var three = one.Join(two, c => c.Id, p => p.Id, (c, p) => new {c.Id, c.Label, p.Value});
Could you just do
var s = from d in db.Data
select new
{
Id = d.ID,
Label = d.Label,
Value = (d.Label == "Apple" ? 0 : d.Value)
};