Updating data linq

11-Nov-2017 17:33 by 3 Comments

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Entity classes defined with LINQ to SQL have to derive from a specific base class, which means that you can have them inherit from any object you want.All classes created using the LINQ to SQL designer are defined as "partial classes" - which means that you can optionally drop into code and add additional properties, methods and events to them.

2) When you have database schema names that aren't very "clean".

The following code demonstrates how to sever relationships between rows, and how to delete a row from the database.

Add the following code before The final step required for creating, updating, and deleting objects, is to actually submit the changes to the database.

NET naming conventions, and I usually find having the designer fix these up for me really convenient (especially when adding lots of tables to your model).

If you don't like the name of a class or property that the designer generates, though, you can always override it and change it to any name you want.

In my first post I provided code samples that demonstrated how to perform common data scenarios using LINQ to SQL including: I performed all of these data scenarios using a LINQ to SQL class model that looked like the one below: In this second blog post in the series I'm going to go into more detail on how to create the above LINQ to SQL data model.

LINQ to SQL, the LINQ to SQL Designer, and all of the features that I'm covering in this blog post series will ship as part of the . You can follow all of the steps below by downloading either Visual Studio "Orcas" Beta 1 or Visual Web Developer Express "Orcas" Beta1.

For example: the "Products" table in our example above resulted in a "Product" class, and the "Categories" table resulted in a "Category" class.

This class naming helps make your models consistent with the .

For example, rather than use "au_lname" and "au_fname" for the property names on an entity class, you can just name them to "Last Name" and "First Name" on your entity class and develop against that instead (without having to rename the column names in the database).

When you drag objects from the server explorer onto the LINQ to SQL designer, Visual Studio will inspect the primary key/foreign key relationships of the objects, and based on them automatically create default "relationship associations" between the different entity classes it creates.

If you already have a database schema defined, you can use it to quickly create LINQ to SQL entity classes modeled off of it.