LINQ to SQL (Part 4 - Updating our Database)
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by Scott Guthrie
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Using SPROCs or Custom SQL Logic for Insert/Update/Delete Scenarios

One of the questions that developers (and especially DBAs) who are used to writing SPROCs with custom SQL usually ask when seeing LINQ to SQL for the first time is - "but how can I have complete control of the underlying SQL that is executed?" 

The good news is that LINQ to SQL has a pretty flexible model that enables developers to override the dynamic SQL that is automatically executed by LINQ to SQL, and instead call custom insert, update, delete SPROCs that they (or a DBA) define themselves. 

What is really nice is that you can start off by defining your data model and have LINQ to SQL automatically handle the insert, update, delete SQL logic for you.  You can then at a later point customize the data model to use your own custom SPROCs or SQL for updates - without having to change any of the application logic that is using your data model, nor would you have to change any of the validation or business rules logic supporting it (all of this stays the same).  This provides a lot of flexibility in how you build your application.

I'll cover how to customize your data models to use SPROCs or custom SQL in a future blog post.


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User Comments

Title: Good Article   
Name: Vishnu Shanmugam
Date: 2010-12-11 12:46:40 AM
Comment:
Excellent article.
Title: very clear   
Name: tarun
Date: 2010-08-13 7:31:17 AM
Comment:
thanks for the clear explanation
Title: this is terrible   
Name: mac
Date: 2010-08-02 4:56:22 PM
Comment:
this is by far the worst display of CRUD i have seen yet.
Title: How can I insert dates   
Name: Ernie Smart
Date: 2010-03-17 1:08:05 PM
Comment:
How can I parse or convert dates? Let's say I have a text box (txtDate) to enter the dates and the database has a field called OrderDate. If either of the follwoing two:
OrderDate = Convert.ToDateTime(txtDate)
OrderDate = DateTime.Parse(txtDate)
I get System.FormatException: String was not recognized as a valid DateTime error.
If I do OrderDate = DateTime.Now, the code executes correctly.
How can convert the date entered in the text box so the program will work?
Thanks
Title: i can't find add,update or delete methods for my data context.   
Name: Enow Mbi
Date: 2010-02-19 11:10:15 AM
Comment:
GREAT ARTICLE.
I can't figure out why i can't find,add,update or delete methods of my data context despite the fact that my table has a primary key.
Title: More Article   
Name: twinsf
Date: 2010-01-28 2:09:59 AM
Comment:
thank youu for helpfull
Title: Bad advice   
Name: Simon
Date: 2008-12-28 11:59:06 PM
Comment:
The partial class validation logic you demonstrate is not testable and is therefore useless to me. Isn't it better advice to put the validation logic in business objects (as Rocky Lhotka would urge). Or alternatively, to put it in a service layer or repository that is testable. Baking your validation logic into these proprietary, tightly coupled, LINQ DTOs seems wrong.
Title: Create items together   
Name: Tom
Date: 2008-12-24 1:49:56 PM
Comment:
Is there a way to create a category and product together? From what I've seen, beverages.Products would be null, so you can't call "Add" on it. You also can't set Products equal to a new EntitySet, because the setter assumes a non-null EntitySet already which it calls "Assign" on.

Thanks!
Title: Very helpful   
Name: Alexander
Date: 2008-11-13 9:20:30 PM
Comment:
Just great. Killed a few days with msdn stuff trying to comprehend logic of Entity Insert/Update/Delete customisatiton. Just got it from this article in a couple of minutes.
Thank you.
Title: Linq doesn't update   
Name: Moez Tounsi
Date: 2008-10-07 12:15:53 PM
Comment:
Following the example above, ling will add a new record with the new parameters.
We have to handle the deletion of the old element.
Title: Excellent   
Name: Wayne
Date: 2008-07-23 12:27:59 AM
Comment:
Excellent article, Well done, a really good read.
Title: Thanks a lot   
Name: Andi
Date: 2007-12-02 11:25:10 AM
Comment:
Thank you for this great article!!!






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