DataSource Controls :: SQL Query Re-Write In Linq To Entity?

Jan 26, 2010

Need to figure out the correct way to do a simple SUM function in Linq, but also manipulate one of the feilds coming back by doing a Substring on it, here is the original SQL query:


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DataSource Controls :: LINQ To Entity Query - Getting Data From The RDBMS

Jan 1, 2010

if LINQ to Entity queries the EDMX class or its .CSDL or SSDL XML on its way to getting data from the RDBMS?

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DataSource Controls :: Accessing FK From A Query Via Entity Query

Jan 21, 2010

I've got a query such as

Dim MediaQuery =
From m
In dB.DOWNLOADS _Where m.ID = id _Select

which returns a record from the database. One of the fields in the record is a FK to another table. I need to read this value to be able to set a dropdown based on the ID but I can't work out how to access it. For a standard record I can just do the following txtTitle.Text = MediaQuery.FirstOrDefault().TITLE

However with the foreign key it doesn't work like that. I've tried drpGroup.SelectedIndex = MediaQuery.FirstOrDefault().DOWNLOAD_GROUPS.ID where DOWNLOAD_GROUPS is the FK field but it returns Object reference not set to an instance of an object. If you're simply wanting to read some values from a single db record in the entitiy framework and one is a foreign key how should I go about getting the value?

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DataSource Controls :: How To Do In Linq To Entity

Feb 2, 2010

select * from MyTable select "MonthName"= case when datepart(month,date1) =1 then 'January' when datepart(month,date1) =2 then 'February' end , count(*) as CountByMonth from venkat group by datepart(month,date1)

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DataSource Controls :: LINQ To Entity Getting The First Row?

Jan 14, 2010

I am using the following LINQ to entity to get data from my db.

It should return only one row. So i want to be able to get the first row in the set and not have to go through a foreach.

I would also like to check and make sure it is only returning one row, if it returns multiple i need to throw an exception


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DataSource Controls :: How To Convert Sql Query Into Linq Query

Mar 10, 2010

select Groupid,GroupName,onorusername from palgroup where groupid in (select distinct Groupid

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DataSource Controls :: LINQ To SQL Doesn't Write To DB?

Mar 29, 2010

I have something like the following in pages in two different projects, which saves to a DB with a LINQ to SQL operation:


One of the pages works with this code and the other doesn't. The only difference is that the project in which it does work employs a data control tool (ListView) and a custom profile provider.

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C# - Rewrite SQL Query Using Linq To Entity

Jul 12, 2010

Hi guys I need to rewrite the sql query below using Linq to entity. Unfortunately I don't have a lot of experience of using Linq.

With TempTableName AS
(SELECT [ColumnName],
ROW_NUMBER() OVER (order by ColumnName desc) as RowNumber from TableName )
Between 10 and 100

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DataSource Controls :: How To Write The Sql Query Or Have To Do Programmatically

Mar 3, 2010

I have a table with columns A and B, values as follows..

-- --
1 11
1 12
1 13
2 21
2 22
2 23

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ADO.NET :: How To Write SQL Insert Into Query Using LINQ

Oct 13, 2010

How I can write following SQL query using LINQ. There is no default constraint define for the ID column so we have explicitly pass the NEWID().

I want to replicate the products of a company to another company.

Insert Into Products Select NEWID() AS ProductID, ProductName, CompanyID = @DestinationID, ProductCategoryID From Products Where CompanyID = @SourceID

Also once I get these result how can I use InsertAllOnSubmit to insert all the records at once without looping it.

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DataSource Controls :: Write SQL Query Result To Label

Mar 22, 2010

I have the following code which writes to a Gridview:


Using the same methods of connecting to the database, how can I amend this code to write the result of a second query (which only returns a number) to a label?

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DataSource Controls :: To Write The Query - Retrieve The Records?

Jan 16, 2010

i have a table for customer forecast with following fields.. customer, year, week, quantity. now i need to write the SP to retrive the records based on the from week,year and to week,year... like this... from 45th week of 2009 to 25th week of 2010. how can write the query...

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DataSource Controls :: Write Alter Schema Query?

Jun 18, 2010

how do i write my alter schema query in

using the sqlclient object..

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DataSource Controls :: Entity Query To Validate Ntry Not Already In A Table

Jun 16, 2010

I have a button click event that adds a record to a table based on the userid and threadid the user is viewing. I am a bit new to entity so I am stumbling around. I have to where conditions

ThreadID == threadid
UserId == userIdPosts

I have this query but do not know how to execute it and if I have it as is I get this in the yellow screen of death Both the theadid and userIdPosts have data in them.

var query = context.TrackLists.First(t => t.ThreadID == threadid);
context.TrackLists.First(t => t.UserId == userIdPosts);

Sequence contains no elements

Line 90: // find is user has already tracked this thread.
Line 91: var query = context.TrackLists.First(t => t.ThreadID == threadid);
Line 92: context.TrackLists.First(t => t.UserId == userIdPosts);

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ADO.NET :: LINQ Entity Framework Query - Construct "nested" Query?

Jan 22, 2011

I have a web app for our golf club. When I compute handicap index for each golfer, I have to select the most recent scores and then a subset of those scores depending on how many rounds of golf the golfer has played. All the scores are entered into a single SQL Express table called "Rounds". Verbally, this is what I'm trying to do:

1) select the twenty most recent golf scores (sort on date descending, "take(20)") [if less than 20 records, then select all available];

2) for this set of records, select the 10 lowest scores (or smaller number if golfer has less than 20 rounds);

3) compute the average round differential for the subset of records, etc. to calculate handicap index (this step is working ok...)

My current VB code has this LINQ query (which is flawed -- it selects the lowest handicap differential scores of ALL records for the filtered user):


How do I modify this query to accomplish items 1) & 2) above? It seems this should be simple, but my experience with queries is still limited.

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Execute LINQ Query Using Properties Of Child Entity Set

Nov 25, 2010

I am having a meltdown over something that seems so simple and yet isn't working. Here's my scenario.

I have an object structure of tEvents, which contains properties of an event like a run of concerts. tEvents in turn contains an entity set of tEventOptions, which include properties like EventDate, Cancelled etc. I would like to query a list of tEvents using properties of the tEventOptions, for example filtering by date.

My pageis using a calendar object to show event dates. So I am trying to find if any tEvents in the List coming back from the database match the date of the day element being rendered in my Calendar control like so (in this snip 'data' is List and results from a db query):


Except r, my query result var, is always true no matter what data it receives. I have tried the sub query using other properties of tEventOption and get the same 'true' result each time. I know that the data does not reflect this result so I clearly have a problem with the structure of my query, but for the life of me I cannot find a way to resolve it.

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Simplify LINQ-To-Entity Query, And Make It Dynamic

Dec 4, 2010

I have this query for getting data through Entity Framework, which works today. Thing is, i want to create the query dynamically, i.e build it up in blocks, but i can't figure out how exactly to do it. I believe if i can somehow save one of the values that i retrieve in the beginning i can do it, but now i retrieve it twice (probably a bit slow as well? Unless the compiler fixes it before quering). Makes sense? Here is the LINQ:


I.e based on if various variables have values.

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Show SQL Trace Of LINQ Query To Entity Framework 3.5

Oct 13, 2010

Best way to show the SQL trace of a LINQ query to Entity Framework 3.5? I am using and EF 3.5.

Dim dbo As Web.Portal.RBMEntities = New Web.Portal.RBMEntities
Dim Query = From RoleAllocations In dbo.RoleAllocations Where RoleAllocations.user_id = _ID And RoleAllocations.expire_date > Today Select RoleAllocations

Console write the SQL trace?

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DataSource Controls :: How To Write A Query Which Reads Data From Optional DDL's?

May 5, 2010

I have couple of DDL's which let user choose couple of different values from it. Once the user has made his selection he clicks on the "Submit" buttion which redirects the user to the other page, which then displays table from backend SQL DB. The pages are named Page1.aspx and Page2.aspx resp. I am using Querystring to carry forward the values of the DDL's to Page2.aspx.

How can i modify the query in such a way that even if one of the DDL's is left blank the Query would ignore that and shall produce the table considering value of DDL2 in the where clause. In case both the DDL's are empty then the query will not have a where clause and shall showcase the complete table as such. I've written a query for this but it's not working the way it shoul.Here is my code for the SQLDataSource: [Code]....

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DataSource Controls :: Write Select Query To Get Counts In Row Values?

Jun 2, 2010

How to write select query to get counts in row values

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Forms Data Controls :: Entity Datasource And Query Extender Using LISTVIEW

Mar 9, 2011

I have a user control, named productslist.ascx. On pruductslist.ascx, I am using Entity Datasource and a QUERY EXTENDER and LISTview. I have a page Defualt.aspx. On Defualt.aspx, I have a TEXTBOX with a SUBMIT button for searching the site. Everthing works fine so far, AS LONG as the results of the Search is posted back to Default.aspx. What I want is for the results of the search to be posted on a different page.
So I created a new page, Results.aspx and set the postback url to it.

What I want is that when a user clicks the Submit button, after entering a search string, the text the entered is used to execute the query on Productslist.ascx and the results displayed on RESULTS.ASPX. Again, everything works fine as long as the results are posted on same page hosting the usercontrol, BUT I want the postback url to be a different page. I am coding in VB and VS 2010.

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DataSource Controls :: Linq Update Via .attach() Giving Entity Exists Error?

Jan 5, 2010

I have a "simple" method that takes a Linq entity containing the information I want to update. The method then creates a list of counties the information is to be updated for, and tries to update the information for each county.

So user goes in fills form out selects update All counties, and the information in the form should be updated for all the counties for the member. Here is the code.


The first pass through the foreach runs perfectly, the second time through I get an error: Cannot attach an entity that already exists.

What is best way to work around this?

I have though about putting the foreach loop in my business_logic layer, and have it pass both the newRecord and OldRecord, but figured I would ask, before making the code change.

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ADO.NET :: Setup Query Result Shaping For LinQ To SQL Instead Of Entity Framework?

Sep 9, 2010

I am new to this, and I am trying to implement a linq query similar to db.Genres.Include("Albums") command from

mvc music store using my current DB setup. I realize that the tutorial mentions Checlking the "Include foreign key columns in the method" when creating the tables in ADO.NET, but if I am using LINQ to SQL classes, then how can I obtain the same effect. And how do I use
db.Genres.Include("Albums") to simplify my life?

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DataSource Controls :: How To Write Query Using Pivot Logic In Sql Server 2005

Jan 7, 2010

i have a table for customer forecast which contains customer, week number and quantit as columns. now i need to write query and list the week as column for each customer and each cell should have a quantity. how to write query for this using pivot logic. i dont want to use cursor.

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DataSource Controls :: Query Using Linq To Sql?

Jun 25, 2010

Im using Linq to Sql in my application, but the problem is:I have a query like this:


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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