Linq Select IN() Query? : linq, select

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12.07.2007 at 03:55PM PST, ID: 23010122

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7.4

Linq Select IN() Query?

Zones: Language Integrated Query - LINQ, Microsoft Visual Basic.Net

Tags: linq, select

How would I replicate the following in Linq, a select in statement:
SELECT * FROM Products WHERE Products.ProductID IN(5,7,8,12)

Anyone?

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Question Stats

Zone: Microsoft

Question Asked By: alivemedia

Solution Provided By: sjturner2

Participating Experts: 4

Solution Grade: A

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12.13.2007 at 10:42AM PST, ID: 20466444

Masteraco:

http://msdn2.microsoft.com/en-us/library/bb308959.aspx

12.13.2007 at 10:46AM PST, ID: 20466477

Masteraco:

Dim db = New Northwind("c:\northwind\northwnd.mdf")
Dim londonCustomers = From cust In db.Customers _
Where cust.City = "London" _
Select cust
For Each cust in londonCustomers
Console.WriteLine("id = {0}, City = {1}", cust.CustomerID, cust.City)

Next

12.13.2007 at 10:48AM PST, ID: 20466500

Masteraco:

' Query for a specific customer
Dim id As String = "ALFKI"
Dim targetCustomer = (From cust In db.Customers _
Where cust.CustomerID = id).First
targetCustomer.CompanyName = "Dr. Frogg's Croakers"

12.13.2007 at 10:50AM PST, ID: 20466515

alivemedia:

Look at my SQL Query, none of the above answers are near doing that.

I ended up just creating a stored procedure, thanks for trying to help me though.

Thanks,
Max

12.13.2007 at 11:18AM PST, ID: 20466747

sjturner2:

The IN keyword is not supported in Linq. The best idea is to use a string builder to build up a long where clause i.e:

Products.ProductID = 5 OR Product.ProuctID = 7 OR ...

You can then use this string in the where method:

.Where(sb.ToString())

Accepted Solution

12.13.2007 at 11:22AM PST, ID: 20466781

Masteraco:

i tried to explain this to he but seems to not understand.

Author wrote

"Look at my SQL Query, none of the above answers are near doing that.
I ended up just creating a stored procedure, thanks for trying to help me though."

LOL

Ceiled

12.15.2007 at 06:44PM PST, ID: 20479519

I know this question's already been accepted, but I just wanted to point out that the "IN" keyword actually is supported in LINQ. I don't have Visual Basic installed here so I can't test it there, but the solution in C# is:

from p in db.Products
where
new int[] { 5, 7, 8, 12 }.Contains(p.ProductID)
select p

The SQL generated for this query is:
SELECT [t0].[ProductID]
FROM [dbo].[Product] AS [t0]
WHERE ([t0].[ProductID]) IN (@p0, @p1, @p2, @p3)

Hope this helps.

coyotee

12.20.2007 at 01:38AM PST, ID: 20505575

Ceiled!

Your query is valid. How would you do a general query like;

select Field1 from Table1 where Table1.Field1 not in (select Fieldx from Tablex) and Table1.Field1 not in (select FieldY from TableY)

Ceiled

12.20.2007 at 07:05AM PST, ID: 20507119

Well, this doesn't generate quite the same query, but it should be equivalent...

from p in data.Products
where
(from tablex in data.Tablex select tablex.Fieldx).Contains(p.ProductID.Value)
select p).CommandText

This generates the following query:

SELECT [t0].[ProductID]
FROM [dbo].[Product] AS [t0]
WHERE NOT (EXISTS(
SELECT NULL AS [EMPTY]
FROM [dbo].[Tablex] AS [t1]
WHERE [t1].[Fieldx] = ([t0].[ProductID])
))

NOT (EXISTS( SELECT...)) should be equivalent to your original query, so I suspect this will do the trick for you. Note that I'm not looking any of this up, I'm just reading your original query and thinking about how I would represent it in C#...LINQ is really extremely intuitive in this way. In C#, you use the Contains() method to find out if one value belongs to a collection of other values -- if you want to find out if it is NOT in that collection, you check !Contains(). If you want to append multiple clauses together, you use "&&" -- the same applies here.

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