Updating data using linq to sql lesbian dating in stamford nebraska
Net to open a database connection, create a command object, execute a SQL statement, iterate through the results and create your C# class instances (objects) manually. The following method marks a single product as discontinued, based on the product ID: As you can see, I’m using a simple LINQ query to get a single product with a Product ID matching the product ID parameter of the method, setting the Discontinued flag, and saving the changes. Let’s say I wanted to discontinue all products which are out of stock and have no units on order, instead of just one.
In any case, entities and context classes will look similar.
Here, we will see how to update a single Student entity (not entity graph). In this way, we can easily update a single entity using DBContext in the disconnected mode. Entry method returns an instance of DBEntity Entry for a specified Entity.
An instance of Db Entity Entry class providea access to information about a given entity and its state.
NET, as well as using a third party library which I will introduce later.
For purposes of this article, I will assume you have a basic working knowledge of LINQ, LINQ to SQL, or LINQ to Entities. According to the Microsoft Developer Network (MSDN), “Entity Framework (EF) is an object-relational mapper that enables .
NET developers to work with relational data using domain-specific objects.” Essentially, it is a layer between your application code and your database which maps your C# classes to database tables.
Previous to Entity Framework, you would have used ADO. Updating individual records in Entity Framework is straightforward and relatively simple: create a context, load the record to be updated, update the properties, and save the changes.
You can change the state of an entity to Added, Updated, or Deleted.
In the next chapter you will learn how to delete a single entity in the disconnected mode.
One frequently asked question about Entity Framework and other Object-Relational Mapping (ORM) libraries is how to perform bulk updates of records in an efficient manner, without unnecessary overhead or excessive database calls.
This article discusses how to insert or update data in the database using the built-in capabilities of Microsoft’s Entity Framework library for .Tags: Adult Dating, affair dating, sex dating