Linq to sql updating
Furthermore, you've retrieved (potentially) an unlimited collection of Customer objects -- that's got to hurt.Furthermore, when you do finally call Save Changes, Entity Framework isn't smart enough to issue the single SQL Update statement I used as my example.Following is the syntax of using LINQ to Insert operation query in c#, to insert data in database.C# Code Before we start implement LINQ to SQL Insert update and delete operations first we need to create a database with required tables and map those tables to LINQ to SQL file (.dbml) if you don't know the process don't worry check this link create and map database tables to LINQ to SQL file (.dbml).Of course, if you're using Entity Framework for an online, transaction-based application where you're manipulating a couple of dozen rows at a time, the batch update problem isn't an issue.
The Delete method itself, by the way, returns an integer result that tells you how many items were deleted (which might be more than one because, after all, there might be multiple customers whose first name is Peter).
But, in one of those columns, a reader pointed out that I've ignored an open source set of Entity Framework extensions that makes it easier for you to achieve that separation: the Lore Soft Entity Framework Extended Library (available through Nu Get as Entity Framework. NET code and generate your SQL statement, the default pattern is different.
With EF LINQ you retrieve the corresponding object, remove it from its collection, and then call Save Changes.
Instead, Entity Framework will generate a SQL statement for .
You'll still only make one trip to the database on the call to Save Changes because Entity Framework will bundle up all of the Update statements into a single transmission wrapped inside a transaction.
All together, that means you've made The multiple retrieval issue is one problem. If you wanted to set the credit limit to ,000 for all Customer rows where the Cust Credit Status column was set to "Premium," you'd use this SQL statement: Again, with ADO.