ADO.NET :: MAP Tables In Linq .dbml File

Sep 4, 2010

I am using VS 2010 I've created LiNQ .dbml file via .. Model>Add New Item>Data>LINQ to SQL Clases I've put table on designer surface using drag & drop. I've done all this from one tutorial. There Is Mapping with arrows between tables in tutorial. How can i do this?

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ADO.NET :: Does Linq Dbml Need Refreshed After Allowing Cascade Deletes On Tables

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How To Update LINQ Dbml Files

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How do add read-only computed column in LinqToSql designer (dbml)? My existing table structure:

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How To Reference A DBML File In An Aspx File

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ADO.NET :: Persist The Changes In Datamanager.dbml File?

Dec 6, 2010

I am using Linq first time.

It has a Datamanager.dbml file

Stored procedure just drag here and method are created correspondence that stored procedure.

If i change any thing in any method in dbml file and drag any stored procedure here then All changes are lost.

Means if i change in a method in dbml file. And i drag a new stored procedure in that file then changes are lost and that particular method have its earlier formation that was by default generated by
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How can i persist my changes in dbml file.

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ADO.NET :: Dbml Change Re-creates Designer.cs File?

Dec 29, 2010

LinqtoSQL / asp.net MVC / C#

Ok, here is the problem:I drag and drop my database table into dbml, so i have new table diagram on dbml.For example, I have User table which has two columns(ID, NAME)Then something.design.cs automatically generates User class and definitions for ID, and NAME.

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[Code]....

then i added new column in database table named "Password" if i delete old diagram in dbml and drag new table, it re-writes whole something.designer.cs file, so i lose all codes i wrote before.I googled it and people say about Partial class, but i dont know how to use partial class.

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DataSource Controls :: Add Synonym To .dbml File?

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I have a dbml file which I have added a couple of tables to. The database also contains synonyms which point to other tables in a different database. I can't seem to drag the synonyms to the design surface though?

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ADO.NET :: Attach .Dbml File In Sql Server 2008 R2?

Dec 13, 2010

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C# - How To Convert The Result Of A Stored Procedure In A Dbml File

May 6, 2010

I have a MVC project that has a Linq to SQL dbml class. It is a table called Clients that houses client information. I can easily get the information to display in a View using the code I followed in Nerd Dinner but I have added a stored procedure to the dbml and it's result set is of IQueryable, not IQueryable. I need to convert IQueryable to IQueryable so I can display it in the same View. The reason for the sproc is so I can pass a search string tothe sproc and return the same information as a full list but filtered on the search. I know I can use Linq to filter the whole list but I don't want the whole list so I am using the sproc.

Here is the code in my ClientRepository with a comment where I need to convert. What code goes in the commented spot.

public IQueryable<Client> SelectClientsBySearch(String search)
{
IQueryable<SelectClientsBySearchResult> spClientList = (from p in db.SelectClientsBySearch(search) select p).AsQueryable();
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}

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SQL Server :: How To Export The Data From Dat File To Tables(Two Tables)

Dec 30, 2010

I am using bulk insert concept to export the data from dat file to tables(Two tables). I am using the temporary table for to do the calculation and insertion to two tables. My problem is whenever I selecting the temp table data after the execution of bulk insertion , the order is changing .I need to get the order as it is in file order(csv,dat,txt).

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ADO.NET :: Join Two Tables Using LINQ?

Jan 24, 2011

I need to make a category filter. For this purpose I have two tables "Ingredient" and "Category"

My Category Table looks like this:

[Code]....

And my ingredient table:

[Code]....

I want to join the two tables so when the KategoriID match it should then return all from that category.

[Code]....

[Code]....

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ADO.NET :: LINQ To SQL - How Do You Join More Than 2 Tables

Sep 9, 2010

I was trying to find out how I can join more than 2 tables using the LINQ-to-SQL syntax. For instance, joining 2 tables in SQL:

SELECT * FROM Table1 AS T1 INNER JOIN Table2 AS T2 ON T1.Key=T2.Column1WHERE T2.Key='17';

can be expressed as:

var Result = from T1 in DbContext.Table1 join T2 in DbContext.Table2 on T1.Key equals T2.ForeignKey where T2.Key=17 select new { T1, T2 };

But how would I join 3 or more tables using LINQ? For example:

SELECT * FROM (Table1 AS T1 INNER JOIN Table2 AS T2 ON T1.Key=T2.Column1) INNER JOIN Table3 AS T3 ON T3.Key=T2.Column2 WHERE T2.Key='37';

I've been searching and experimenting and I cannot seem to find any informraiton on this. One example I found involves putting the result for the frist join into a temp object, and then performing the second join. I'm not sure performance-wise if that's the same as doing a 3-table join directly using a single SQL statement.

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ADO.NET :: Linq On Multiple Tables With Same Columns

Aug 17, 2010

I have a partitioned db where several tables have the exact same structure. I'm able to query the tables using linq, but only by quering the individual tables 1 at a time and by using the explicit table name. For example at the moment, I have 8 tables so I have something similar to the following:

[Code]....

Is there any way, that based on a certain value (stringValue), I could determine which table to query and then code the linq query just once?

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C# - Pulling Out Different Columns From Tables Using LINQ

Mar 23, 2011

I have two tables:

Entity
ID (PK), int
Name
Descrip
Users
ID (PK)
EntityID, int (this is not connected to Entity table)

Now I am using LINQ to pull the records which has a Entity.ID = something. Which will show me couple of records in my GridView. Here is my LINQ statement:

protected void Page_Load(object sender, EventArgs e)
{
string getEntity = Request.QueryString["EntityID"];
int getIntEntity = Int32.Parse(getEntity);
OISEntityTestingDataContext db = new OISEntityTestingDataContext();
//OISLinqtoSQLDataContext db = new OISLinqtoSQLDataContext();
var tr =
from r in db.Users
join s in db.Entities on r.UserID equals s.ID
where s.ID == getIntEntity
select new
{
//To Show Items in GridView!
};
GridView1.DataSource = tr;
GridView1.DataBind();
}

Now here I am getting an error mesg on 'join' The type of one of the expressions in the join clause is incorrect. Type inference failed in the call to 'Join What does that mean?

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ADO.NET :: Can't Group With Linq When Join Several Tables

Dec 9, 2010

I have T_articles to save the articles.

each article has authorCode , and categoryCode.

each article can be modified by the author several times.

and I save every modification in the T_articles in a difference row.

now I want to dislpay for each autor:

author name, article name , article category's name, last modified date

In SQL I should to it like that:

[Code]....

I try to write it in Linq so:

[Code]....

so I got error:

[Code]....

and again I got an error:

[Code]....

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ADO.NET :: How To Check If The Tables Has Rows In Linq

Nov 23, 2010

I am very new to Linq , i want to check if the PrintingAdminSetting table has rows in it and then if it has then i want to get the value and assign it to txtMaxJobs textbox

below is teh code

, please let me know teh syntax to check .

var DC = new ServiceDataContext();
var rec = DC.PrintingAdminSetting.Where("").First();
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ADO.NET :: Searching Through Multiple Tables (Linq To SQL)?

Aug 12, 2010

I have a couple tables that are kind of unrelated - id like to search through both of them and create a type that i can sift through later

something like this doesnt work

[Code]....

I basically want to create a list of "AnimalSearchResults" that contains all dogs and all cats that have that name Whats the best way to do something like this?

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ADO.NET :: How To Join 3 Related Tables With Linq To Sql

Nov 9, 2010

Here's my DB structure:

I have three tables.

User, Details, Optional
User has fields: ID, FirstName, LastName
Details has fields: ID, MyDetails1, MyDetails2, User_ID
Optional has fields: ID, MyOptions1, MyOptions2, User_ID
There is a 1 to many relationship with User & Detail (User ID & Detail User_ID)
There is a 1 to many relationship with User & Optional (User ID & Optional User_ID)

With that said, one user can have many details and/or many optionals

Now I'm trying to build a linq query that will say:

"where user id = x, select FirstName, LastName, all MyDetails1 from every record where User_ID == x, all MyOptions1 from every record where User_ID == x"

After the merge I should have one string that lists the distict user & all of their many fields:

FirstName + LastName + (MyDetails1 + MyDetails1 + MyDetails1..etc) + (MyOptions1 + MyOptions1)

Anyone try this before?

I tried this with JOIN but this doesn't do the trick for what I'm looking for.

So if I had 3 MyDetails records associated with ID == 2, I would get three results like:

John Doe MyDetails_X
John Doe MyDetails_Y
John Doe MyDetails_Z

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C# - Linq - Group By Multiple Tables?

Aug 8, 2010

Using Linq to Sql how do i group the following 2 tables.

Orders Table:

CustomerID | Name |Date
1 | order1 | 2010-01-01
2 | order2 | 2010-01-01
2 | order3 | 2010-04-01

Calls Table:

CustomerID | Name |Date
1 | call1 | 2010-01-01
3 | call2 | 2010-06-01
2 | call3 | 2010-05-01

I want to group the two tables by date , Result:

Date | Orders | Calls
2010-01-01 | 2 | 1
2010-04-01 | 1 | 0
2010-05-01 | 0 | 1
2010-06-01 | 0 | 1

i know how to group a single table ,from o in Orders group o by o.Date.Date into og select new {Date = og.Key,Orders= og.Count()};

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ADO.NET :: Can't Combine "LINQ Join" With Other Tables?

Jan 8, 2011

The main problem is that I recieve the following message:

"base {System.SystemException} = {"Unable to create a constant value of type 'BokButik1.Models.Book-Author'. Only primitive types ('such as Int32, String, and Guid') are supported in this context."}"

based on this LinQ code:

[Code]....

How shall I solve this problem to get a class instance that contain with property title and Book-AuthorID?I also have tried making some dummy by using "allbooks" relation with Code Samples from the address

http://www.hookedonlinq.com/JoinOperator.ashx. Unfortunately, still same problem.

I also have taken account to Int32 due to entity framework http://msdn.microsoft.com/en-us/library/bb896317.aspx. Unfortunatley, still same problem.

Using database with 3 tables and one of them is a many to many relationship. This database is used in relation with entity framework

Book-Author
Book-Author (int)
BookID (int)[code]....

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