Updating data linq
Updating data linq - who is daren kagasoff currently dating
First, we will have to retrieve the ‘user’ object we want to delete, and then add this deletion operation in the queue by ‘Delete On Submit’ method.
LINQ to SQL will then automatically translate these LINQ query expressions to the appropriate SQL code to execute at runtime.In the example data model we defined above this class was named "Northwind Data Context".The Northwind Data Context class has properties that represent each Table we modeled within the database (specifically: Products, Categories, Customers, Orders, Order Details).We just need to create a new object of corresponding database table type, then add it to the Data Context object and then commit the changes. If you want to insert more than one row, then you will have to create a ‘List’ array object containing all the ‘User’ objects and then use ‘Insert All On Submit‘ method, it will work fine.Here is a small block of c# code samples to create new ‘User’ linq to sql class(Representing ‘Users’ Table in Database) and add it to ‘Users Data Context’ class(Represents the database) and commit the changes to original database by ‘Submit Changes'(without this, no changes will be reflected to database): For your information, the above code example is for . If you are using an earlier version, you will have to use ‘Add‘ method instead of ‘Insert On Submit‘ . Deleting data/row from database using linq is as simple as inserting data and this is also sql syntax free operation 🙂 .Thus, no changes will be reflected to your database.
Sometime, while writing comparatively big linq to sql query, you might be interested to see what kind of resultant sql query is actually generated for a specific kind of operations.
Over the last few weeks I've been writing a series of blog posts that cover LINQ to SQL.
LINQ to SQL is a built-in O/RM (object relational mapper) that ships in the .
Below is a class model created for the Northwind sample database and which I'll be using in this blog post: When we designed our data model using the LINQ to SQL data designer above we defined five data model classes: Product, Category, Customer, Order and Order Detail.
The properties of each class map to the columns of a corresponding table in the database.
NET Framework 3.5 release, and which enables you to easily model relational databases using . You can use LINQ expressions to query the database with them, as well as update/insert/delete data.