I am trying to convert this sql into linq but so far not able to
Below code is successfully giving result as I need
SELECT [dbo].[Ingredient].[IngredientId]
,[EnglishName]
,[HindiName]
,COUNT([dbo].[RecipeIngredient].RecipeId) As IngredientUsed
FROM [DB_A19C63_kmkb].[dbo].[Ingredient]
JOIN [dbo].[RecipeIngredient]
ON [dbo].[RecipeIngredient].IngredientId = [dbo].[Ingredient].[IngredientId]
WHERE [dbo].[RecipeIngredient].IngredientId = 39
GROUP BY [dbo].[Ingredient].[IngredientId]
,[EnglishName]
,[HindiName]
Result
IngredientId EnglishName HindiName IngredientUsed
39 Asafoetida Hing 628
My Linq Code
(from x in _unitOfWork.IngredientRepository.GetManyQueryable()
select new IngredientEntity
{
IngredientId = x.IngredientId,
EnglishName = x.EnglishName,
HindiName = x.HindiName,
Pros = x.Pros,
Cons = x.Cons,
Calories = x.Calories,
IngredientUsed = (from z in _unitOfWork.RecipeIngredientRepository.GetAll()
where z.IngredientId == x.IngredientId
select z.RecipeId).Count(),
DepartmentId = x.DepartmentId
}).OrderBy(x => x.EnglishName);
Thanks in Advance
Related
I need to convert my SQL statement to LINQ.
SELECT
dbo.Transactions.TypeRefID,
dbo.TransactionItems.ItemRefID,
SUM(dbo.TransactionItems.Quantity) AS Qty
FROM
dbo.TransactionItems
LEFT OUTER JOIN
dbo.Transactions ON dbo.TransactionItems.TransactionRefID = dbo.Transactions.TransactionID
GROUP BY
dbo.Transactions.TypeRefID, dbo.TransactionItems.ItemRefID
HAVING
(dbo.Transactions.TypeRefID = 1)
AND (dbo.TransactionItems.ItemRefID = 5)
I tried converting the above statement into LINQ and this is what I've done.
var query = from t in db.Transaction
join i in db.TransactionItem on t.TransactionID equals i.TransactionRefID
where t.TypeRefID == 1 && i.ItemRefID == 5
group i by new
{
t.TypeRefID,
i.ItemRefID
} into g
select new
{
TypeRefID = g.Key.TypeRefID,
ItemRefID = g.Key.ItemRefID,
Quantity = g.Sum(q => q.Quantity)
};
When I run my code I get error "System.Linq.Queryable.FirstOrDefault(...) returned null"
I'm using it like this
if (query != null)
string qty = query.FirstOrDefault().Quantity.ToString();
The error is called on "query.FirstOrDefault().Quantity.ToString()"
How to avoid this error?
I have a situation where two tables should be joined with multiple columns with or condition. Here, I have a sample of sql query but i was not able to convert it into linq query.
select cm.* from Customer cm
inner join #temp tmp
on cm.CustomerCode = tmp.NewNLKNo or cm.OldAcNo = tmp.OldNLKNo
This is how i have write linq query
await (from cm in Context.CustomerMaster
join li in list.PortalCustomerDetailViewModel
on new { OldNLKNo = cm.OldAcNo, NewNLKNo = cm.CustomerCode } equals new { OldNLKNo = li.OldNLKNo, NewNLKNo = li.NewNLKNo }
select new CustomerInfoViewModel
{
CustomerId = cm.Id,
CustomerCode = cm.CustomerCode,
CustomerFullName = cm.CustomerFullName,
OldCustomerCode = cm.OldCustomerCode,
IsCorporateCustomer = cm.IsCorporateCustomer
}).ToListAsync();
But this query doesn't returns as expected. How do I convert this sql query into linq.
Thank you
You didn't tell if list.PortalCustomerDetailViewModel is some information in the database, or in your local process. It seems that this is in your local process, your query will have to transfer it to the database (maybe that is why it is Tmp in your SQL?)
Requirement: give me all properties of a CustomerMaster for all CustomerMasters where exists at least one PortalCustomerDetailViewModel where
customerMaster.CustomerCode == portalCustomerDetailViewModel.NewNLKNo
|| customerMaster.OldAcNo == portalCustomerDetailViewModel.OldNLKNo
You can't use a normal Join, because a Join works with an AND, you want to work with OR
What you could do, is Select all CustomerMasters where there is any PortalCustomerDetailViewModel that fulfills the provided OR:
I only transfer those properties of list.PortalCustomerDetailViewModel to the database that I need to use in the OR expression:
var checkProperties = list.PortalCustomerDetailViewModel
.Select(portalCustomerDetail => new
{
NewNlkNo = portalCustomerDetail.NewNlkNo,
OldNLKNo = portalCustomerDetail.OldNLKNo,
});
var result = dbContext.CustomerMasters.Where(customerMaster =>
checkProperties.Where(checkProperty =>
customerMaster.CustomerCode == checkProperty.NewNLKNo
|| customerMaster.OldAcNo == checkProperty.OldNLKNo)).Any()))
.Select(customerMaster => new CustomerInfoViewModel
{
Id = customerMaster.Id,
Name = customerMaster.Name,
...
});
In words: from each portalCustomerDetail in list.PortalCustomerDetailViewModel, extract the properties NewNKLNo and OldNLKNo.
Then from the table of CustomerMasters, keep only those customerMasters that have at least one portalCustomerDetail with the properties as described in the OR statement.
From every remaining CustomerMasters, create one new CustomerInfoViewModel containing properties ...
select cm.* from Customer cm
inner join #temp tmp
on cm.CustomerCode = tmp.NewNLKNo or cm.OldAcNo = tmp.OldNLKNo
You don't have to use the join syntax. Adding the predicates in a where clause could get the same result. Try to use the following code:
await (from cm in Context.CustomerMaster
from li in list.PortalCustomerDetailViewModel
where cm.CustomerCode == li.NewNLKNo || cm.OldAcNo = li.OldNLKNo
select new CustomerInfoViewModel
{
CustomerId = cm.Id,
CustomerCode = cm.CustomerCode,
CustomerFullName = cm.CustomerFullName,
OldCustomerCode = cm.OldCustomerCode,
IsCorporateCustomer = cm.IsCorporateCustomer
}).ToListAsync();
var result=_db.Customer
.groupjoin(_db.#temp ,jc=>jc.CustomerCode,c=> c.NewNLKNo,(jc,c)=>{jc,c=c.firstordefault()})
.groupjoin(_db.#temp ,jc2=>jc2.OldAcNo,c2=> c2.OldNLKNo,(jc2,c2)=>{jc2,c2=c2.firstordefault()})
.select(x=> new{
//as you want
}).distinct().tolist();
I am trying very hard but cannot reach my result. I am new to linq. What should be the proper linq query for this sql query. Please help me out of this.
update Teacher set RemainingCredit = RemainingCredit- Course.Credit
from
CourseAssignTeacher
join Course on CourseAssignTeacher.CourseId = Course.Id
join Teacher on CourseAssignTeacher.TeacherId = Teacher.Id
where CourseAssignTeacher.Id = 1
Write a query that selects what you want to update, then use a foreach loop and context.SubmitChanges:
using (DBDataContext db = new DBDataContext())
{
var toUpdate = from cat in db.CourseAssignTeacher
join c in db.Course on cat.CourseId equals c.Id
join t in db.Teacher on cat.TeacherId equals t.Id
where cat.Id = 1
select new { Teacher = t, Course = c, CourseAssignTeacher = cat };
foreach (var x in toUpdate)
{
x.Teacher.RemainingCredit = x.Teacher.RemainingCredit - x.Course.Credit;
}
db.SubmitChanges();
}
IBookingRepository bookingResp = new BookingRepository();
IQueryable<bookingTest> bookings = bookingResp.GetAllBookingsByView();
var grid = new System.Web.UI.WebControls.GridView();
grid.DataSource = from booking in bookings
join f in getallAttendees on booking.UserID equals f.UserID into fg
from fgi in fg.DefaultIfEmpty() //Where(f => f.EventID == booking.EventID)
where
booking.EventID == id
select new
{
EventID = booking.EventID,
UserID = booking.UserID,
TrackName = booking.Name,
BookingStatus = booking.StatusID,
AttendeeName = booking.FirstName,
// name = account.FirstName,
AmountPaid = booking.Cost,
AttendeeAddress = booking.DeliveryAdd1,
City = booking.DeliveryCity,
Postcode = booking.Postcode,
Date = booking.DateAdded,
hel = fgi == null ? null : fgi.HelmetsPurchased }// Product table
Hi, the above query doesnt executes it gives an error: The specified LINQ expression contains references to queries that are associated with different contexts. Any one can spot the what the problem is with the query.
I think that your getAllAttendees is from a different context than bookings so you won't be able to join them. To give a more exact answer you need to show where bookings and getAllAttendees comes from.
var q = (from Labels in dc.tblArtworkDataLabels select Labels).ToList();
But I need this to do the quivalent of:
SELECT d.ID, d.labelID, d.dataID, d.data, l.templateID
FROM tblArtworkDataLabels AS d INNER JOIN
tblArtworkData AS l ON d.dataID = l.ID
WHERE (l.templateID = 238)
How do I do this in LINQ?
Edit
Sorry! Missed the WHERE clause on original statmenet!
var result = dc.tblArtworkDataLabels
.Join(dc.tblArtworkData, l => l.ID, d => d.dataID, (l, d) => new {l, d})
.Select(o => new {
Id = o.d.ID,
LabelId = o.d.labelID,
DataId = o.d.dataID,
Data = o.d.data,
TemplateId = o.l.templateID,
})
.Where(o => o.l.templateID == 238);
If you have a correct foreign key on tblArtworkData to the primary key on the tblArtworkDataLabels and have imported them correctly into the DBML designer you can have LINQ2SQL implicitly creating the join:
from l in tblArtworkData
where l.templateID = 238
select new {
Id = l.tblArtworkDataLabel.ID,
LabelId = l.tblArtworkDataLabel.labelID,
DataId = l.tblArtworkDataLabel.dataID,
Data = l.tblArtworkDataLabel.data,
TemplateId = l.templateID,
}
See my answer on the question "LINQ to SQL: Multiple joins ON multiple Columns. Is this possible?" for how the implicit join translates to SQL.
Edit:
In the case I misunderstood your relations and you have many tblArtworkDataLabels to one tblArtworkData you have to turn the query the other way around
from d in tblArtworkDataLabels
where d.tblArtworkData.templateID = 238
select new {
Id = d.ID,
LabelId = d.labelID,
DataId = d.dataID,
Data = d.data,
TemplateId = d.tblArtworkData.templateID,
}
try
var q = (from Labels in dc.tblArtworkDataLabels
join data in dc.tblArtworkData on Labels.ID equals data.DataID select Labels).ToList();