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Once defined in partial classes like below, these validation methods will automatically be enforced anytime we write code to update our data model objects in an application.Now that we have our data model classes created, and have applied validation rules to them, we can query and interact with the data.Like I discussed in my last blog post in this series (Part 6: Retrieving Data Using Stored Procedures), we can drag/drop SPROCs from the server-explorer onto the method pane of our Data Context designer.We'll want to-do this with our newly created Insert Order SPROC: Our last step will be to tell our data access layer to use the Insert Order SPROC when inserting new Order objects into the database.NET Framework 3.5 release, and which enables you to model relational databases using . You can use LINQ expressions to query the database with them, as well as update/insert/delete data.Below are the first six parts in this series: In part 6 I demonstrated how you can optionally use database stored procedures (SPROCs) and user defined functions (UDFs) to query and retrieve data using your LINQ to SQL data model.
To help illustrate this - let's start from scratch and build-up a data access layer for the Northwind sample database: In my Part 2: Defining our Data Model Classes tutorial I discussed how to use the LINQ to SQL ORM designer that is built-in to VS 2008 to create a LINQ to SQL class model like below: After defining our data model classes and relationships we'll want to add some business logic validation to our data model.
The code and tests you write against your data model classes can stay the same regardless of whether you use dynamic SQL or SPROCs.
We'll now spend the rest of this blog post demonstrating how we can update the data model we've built to use SPROCs for updates/inserts/deletes - while still using the same validation rules, and working with the same code snippets above.
When building a LINQ to SQL data layer you'll usually want to encapsulate common LINQ queries (or SPROC invocations) into helper methods that you add to your Data Context class.
We can do this by adding a partial class to our project.
We can do this by adding partial classes to our project that add validation rules to our data model classes (I cover how to-do this in-depth in my Part 4: Updating our Database LINQ to SQL tutorial).