DataSource Controls :: Can Get Two Tables In Only One Query With LINQ To Entities

May 20, 2010

can get two tables in only one query with LINQ to Entities

Code for example:

[Code]....

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DataSource Controls :: LINQ And C# - Accessing More Then 2 Tables In A Query

Apr 23, 2010

As the title sugests, I am missing a (basic?) concept as I teach myself asp.net, linq, and C#. It has been awhile since I've done anything object oriented, so I don't know how much that is impacting this gap in my understanding. Anyhow, here is what I am trying to do. I have three SQL Server tables: PERSON, POSITION, AREA. There is a 1 to many relationship between PERSON and POSITION, and a 1 to 1 relationship between POSITION and AREA. Given the following code I verify who the person is who has logged into the browser:

[Code]....

I want to be able to return all of the AREAs the person is able to access, based on the position they currently hold. I am able to easily do this in a SQL Server query, and I am sure I can do this with a SQL stored procedure once I pass the EMPLOYEE_ID to the procedure. However, I would rather do this in the page_load event, and load the returned results into gridview1 for the viewer. The issue I am running into is in building the LINQ query. When I try to build it, I can only get access to two of the three tables, depending on which table I select with db. Is it possible to access all three tables in the same query?

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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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DataSource Controls :: Generating Tables From Entities

May 13, 2010

I'm creating entity on a project to use them as data on my website. I got my base simple entity Users and my DataContext. The thing is i would like the database to create the table as i create Entities.

I mean, actually my database doesn't have a Users table and do not generate it as i build and launch the project. I used to be a Java dev and in Java the table can be created with JPA so i guess Microsoft made it possible with ASP.net but how to do? I've looked on the web but didn't find it.

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Web Forms :: Tables In LINQ To Entities Are Not Related

Aug 3, 2010

I'm working with asp.net 3.5 WebForms and LINQ to Entities.

I created the database with their relationships, but when I go to import the data with LinqToEntities, some reports and have not seen any reports 1 to 1.

I can create them after the reports have imported the tables LinqToEntities?

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DataSource Controls :: Editing Data With Linq To Entities

May 21, 2010

I'm trying to update data with the EF I can't seem to get the EntityKey when I debug and hit this line befor I save changes _entities.ApplyPropertyChanges entityToEdit.EntityKey .EntitySetName, blogEntryToEdit); The EntityKey is null dose anyone have any idea how this key is set can't SaveChanges() without it _entities.ApplyPropertyChanges(entityToEdit.EntityKey .EntitySetName, blogEntryToEdit);

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DataSource Controls :: Perform A Search For Records In Linq-to-Entities?

Jan 26, 2010

I trying to create a search mechanism for records in a EDM based on text entered on a text box in a web page.

For example, if I enter a partial name of a customer and/or state abrebiation for that customer on the Text Box (abc, TX)s, I want to search name and state fields in a Customer table in my database for matching customers.

I found a solution with the namespaceSystem.Linq.Dynamic, but for some reason it is not working. It does not expose the Search() method. Here is the code I am using to perform the search;

[Code]....

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DataSource Controls :: Dynamic Linq To Entities...querying Date Fields?

Mar 9, 2010

I am trying to use Linq to Entities with the Linq.Dynamic library (via Scott Guthrie) and I'm having some strange issues with querying dates.

[Code]....

This return no results, when it definitely should...

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What Is The Underlying Type Of The Result From A Linq To Entities Query

Jan 20, 2011

for example,

var result = from category in myEntities.Categories
where category.UserId == userId
orderby category.CategoryName
select category;

What is the type of "result"? I casted it to an IQueryable variable and it worked except it did not have some of the methods normally available, e.g. Count(). In my program I have to cast it to some explicit types and then use the Count() method.

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MVC :: How To Pass Linq To Entities Query Result To View

Apr 1, 2010

i have a new question: i read all the tutorials that i found but i cannot understand how to pass a result of a linq to entities result to the view so that i can display the results. My query is actually in the controller function ot the view, i would now loop the results and display them in the page. How?

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DataSource Controls :: Linq To Entities - Multilevel Projection Into Business Class And Not Breaking Deferred Execution?

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;}
}

Now I also have a pair of business layer classes foo and fooChild

foo
{
public Guid Id {get; set;}
ilist<fooChild> Children {get;set;}
}
fooChild
{
public Guid kidId {get; set;}
}

My aim is to write a linq to entites that will allow me to convert the entity foo and children into the business foo and children without breaking deferred execution ( I will be adding filters to reduce the recordset at a higher coding level in the business layer)

doing something like

this.context.fooEntity

.include(fooChildEntity)

.Select( fe => new foo { Id=fe.Id ,

fe.foreach(fec => Children.add( new fooChild { kidId = fec.kidId}))})

.AsIQueryable()

is plainly rubbish and would never compile - it is however an indication of the direction I was thinking .

Even if I got a foreach to work like that or similar it would break deferred execution

At this point there are around 300,000 foo entities which I will eventualy filter to 5 or 6 foo's - this is why deferred execution is needed.

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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 :: How To Get Data From Two Tables In Linq

Apr 28, 2010

How to get data from two tables through linq .1 ) productsDetails 2) productsImages to bind further listview.

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DataSource Controls :: How To Select Multiple Tables By Using LinQ In MVC

May 19, 2010

I'm using ASP.NET MVC to create a small web apllication.

Here is my database And here is my class

[Code]....

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DataSource Controls :: What's Faster Working With DataSet OR Working With Collections (LINQ To Entities)

May 21, 2010

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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DataSource Controls :: Sum Data From Two Columns In Different Tables - SQL Query

Feb 9, 2010

I am trying to create an application in which there is a summary of outstanding payments.

One table is Table_Bills.

The other table stores records of Payments made and is called Table_Payments.

In summary i want to show 3 figures - each in separate one field datagridview with a data_source in separate data_adapter:

1) Ammount_Due 2) Amount_Paid 3) Balance.

The first two are no problem but the last is giving me a headache.

I tried this:

SELECT SUM(DHB_New_Jobtable.DayWage) - SUM(DHB_Payments.Ammount) AS Expr1

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DataSource Controls :: How To Join Two Tables And Get Uncommon Records Using LINQ

Jan 22, 2010

I have two tables namely "CategoryMapping" and "PartnerCategory"...The partnercategory table has foreign key with categorymapping on CategoryID...

let us say categorymapping should be filed first then partnercategory should be filed based on the categories defined in categorymapping. For example my two tables have the following data:

[code]....

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DataSource Controls :: Deleting Data From The Multiple SQL Tables With LINQ (C#)?

Apr 22, 2010

I'm looking for ideas on deleting data from the multiple SQL tables with LINQ (C#).

My existing solution does the following:

1. DeleteAllOnSubmit( Subset of the data from the child table)

2. DeleteAllOnSubmit( Subset of the data from another child table)

3. DeleteAllOnSubmit( Data from the parent table)

4. CommitChanges()

All this resides within a single method, which makes it ugly and not re-usable.

I have considered the following alternatives, but I decided not to use them:

1. Cascade delete on the tables.

2. Do a join on all tables from which I will remove the data, but I'm not sure yet whether I could pass a join query to DeleteAllOnSubmit().

3. Write stored procedure(s) to delete data from each table. I don't have the time to implement this due to a large number of tables and the time constraints.

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DataSource Controls :: How To Create An Insert Statement For Two Tables In One Query

Apr 1, 2010

i have a form view that takes fields from two tables 'Contract' and 'volunteers', however because i used a query builder,i have to input an insert statement. How do i create an insert statement for two tables in one query?

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C# - Execute LINQ Query When The Tables Name Stored In A Variable?

Jul 30, 2010

I want to do execute a LINQ query, and I have the name of the table to query stored in a variable:

string tableName = "SomeTable";
DataContext db = new DataContext();
var vResult = from t in db.tableName where t.Id = ....

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ADO.NET :: Need To Query Atleast 35 Tables Using Linq To Sql(SQL Server Database?

Aug 27, 2010

I am a little new to this concept so bear with me.1) I need to query atleast 35 tables using linq to sql(SQL server database) . I am not able to add all the database entities in Linq to sql classes?

2)(View Model issue) When I use List<Reportcollection> and also List<Receipt> to convert the result then its giving an error that "Cannot convert list<anonymous> to list<string>"

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Databinding Multiple Tables Linq Query To Gridview?

Jun 3, 2010

how can I display a linq query in a gridview that has data from multiple tables AND allow the user to edit some of the fields or delete the data from a single table?

I'd like to do this with either a linqdatasource or a linq query. I'm aware I can set the e.Result to the query on the selecting event. I've also been able to build a custom databound control for displaying the linq relations (parent.child).

However, I'm not sure how I can make this work with delete? I'm thinking I may need to handle the delete event with custom code.

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Ordering Sub-items Within Ordered Items In A Linq To Entities Query?

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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DataSource Controls :: Query Using Linq To Sql?

Jun 25, 2010

Im 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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DataSource Controls :: One Linq Query With Two Db Connection?

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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