DataSource Controls :: LINQ To Entities Sub - Query - Doesn't Support The "IN" Clause
Apr 7, 2010
I'm having trouble writing what should be a simple sub-query using LINQ to Entities. I have two tables: Customers and Orders that have a relation on the CustID field. Not all Customers have a record in the Orders table, while some have mutiple records. In traditional SQL, you could write the query like this: SELECT * FROM Orders where CustID IN (SELECT CustID FROM Customers) I know this could be done as a JOIN in both SQL and L2E, but my actual query is more complex (about 8-9 joins), so I am hoping to find a L2E sub-query equivalent. Something like this:
[Code]....
I know LINQ to Entities does not support the " IN " clause, so I am looking for something that will work in its place.
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[Code]....
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Feb 22, 2010
In the code bdehind && syntax does not work, any ideas?
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Feb 26, 2010
I have records with and without a email entered in the field called 'email'.
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May 25, 2010
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May 25, 2010
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Feb 15, 2010
I know I'm missing something here but I can't figure out what it is. I've got a query joining three tables....accounts, payments, and a table linking the two (there is a M:M relationship).I'm trying to pull a list of all accounts in the account table that have a payment that needs to be resequenced, and also the maximum payment priority if there are any payments that haven't been fully paid. If all payments HAVE been fully paid, I want to return a 0.
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[Code]....
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Private Sub GridView1_RowDeleting(sender As Object, e As System.Web.UI.WebControls.GridViewDeleteEventArgs) Handles GridView1.RowDeleting
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End Sub
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Jun 27, 2010
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Mar 9, 2010
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[Code]....
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for example,
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Nov 23, 2010
Im my MVC 3.0 Application, I created a helper like below;
[Code]....
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[Code]....
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Exception Details: System.NotSupportedException: LINQ to Entities does not recognize the method 'System.String GenerateURl(System.String)' method, and this method cannot be translated into a store expression. Source Error:
Line 43: public Blogs GetBlog(string urlstring) {
Line 44:
Line 45: return GetAll().SingleOrDefault(x => BlogUrlGeneration.GenerateURl(x.ArticleTitle).Equals(urlstring));
Line 46: }
Line 47:
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Mar 18, 2010
I have a problem. (this a simplfied example)
In Entity framework I have a class which is effectively
fooEntity
{
public Guid Id {get; set;}
and a collection of fooChildEntity
}
a fooChildEntity is again an entityframework class
fooChildEntity
{
public Guid kidId {get; set;}
}
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foo
{
public Guid Id {get; set;}
ilist<fooChild> Children {get;set;}
}
fooChild
{
public Guid kidId {get; set;}
}
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select Groupid,GroupName,onorusername from palgroup where groupid in (select distinct Groupid
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I mean, what is the faster way to get as fast as I can more than one table with stored procedure? Is there any study what is faster and why? There is a big problem getting more than one table at once with Entities, so the only way is DataSet. But I was told DataSet work very slow. Is that true?
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I am using Entity Framework to contact my data base. as part of my web code I am using Linq to entities, and I want to determine the number of elements in an anonymous type list. I can't get it to work, I get the exception: "LINQ to Entities does not recognize the method 'Int32 Parse(System.String)' method, and this method cannot be translated into a store expression."
var questItem = from chapters in context.TestChapter
from questions in context.Question
where chapters.ID == int.Parse(Request.QueryString["id"])
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select questions.ID;
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I have something like the following in pages in two different projects, which saves to a DB with a LINQ to SQL operation:
[Code]....
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Aug 25, 2010
I have a few tables, Listings, ListingImages and a few others related to Listings. ListingImages is related to Listings so that you can have many ListingImages per Listing.
When I query this table I do;
[code].....
Now this is fine. However, I now want to sort the ListingImages independently within each Listing (by an ImageOrder column I have in that table).
How can I do this and pass all my Includes(...). Would it be bad form to sort the ListingImages within the View as this solution seems to work?
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Jun 25, 2010
I´m using Linq to Sql in my asp.net application, but the problem is:I have a query like this:
[Code]....
My query is not returning anything, how do I do to get this?my problem is with this interval I need to have.
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Aug 10, 2010
When i type and run the following query in ASP.net, then get a error ("Comparison of the data types ntext, text, XML and image data types can not be processed by SQL Server.") (translated from Dutch...)
var gebruikerrow = from u in db.Users
where u.login=="dsf"
select u.login;
foreach (var Result in gebruikerrow)
{
Label50.Text += Result.ToString() + " ";
}
What am i doing wrong?
the Datatype for login (in the table Users) is Text.
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May 31, 2010
I want to use from two db connection in one linq query
My sample is:
int a=1;
if(a==1)
DataClasses1DataContext1 db = new DataClasses1DataContext1();
else
DataClasses1DataContext2 db = new DataClasses1DataContext2();
var q =
from c
in db.F_Groups
select c;
In this code a=1 so db connection is DataClasses1DataContext1
I want if a=2 then db connection = DataClasses1DataContext2
but this code is error.
db connections is completely same but in two deferent class a db connection is sql and another is oracle
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