Cam show live chat gratuit sex - Updating data linq

We don’t have to, because the Data Context object keeps track of all objects it is containing in a time frame(after we retrieving them).When the ‘Submit Changes’ method called, it simply commits it’s all containing objects’ changes.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.

updating data linq-26

I have also tried it this way before and got the same error Quite often, if you look at the actual SQL that Linq-to-SQL generates, you'll see that it is being really over-zealous with matching the database row that you initially retrieved.

Imagine that you have a table with columns ID(PK), A, B, C. Change Conflict Exception: Row not found or changed.

LINQ to SQL tracks your changes and is ready to transmit them back to the database when you call Submit Changes.

rule in the foreign-key constraint in the database, or use your own code to first delete the child objects that prevent the parent object from being deleted. For more information, see How to: Delete Rows From the Database.

When it hits submit changes, it throws exception that the row wasn't found or was changed.

I am the only person using this so there's no other conflicts with accessing the db or locking. I have stepped through with debugger and the data persists all the way through the process, including the changes that I'm trying to make.Please use the database structure given below, if you want to try the following examples directly.I am assuming, you already know how to create dbml/linq to sql classes: Being Lin Q as a ORM, it’s quite easy and sql syntax free way to insert data using Lin Q.Then just use the ‘Submit Changes’ method to commit the changes to database.Here is a simple code example below which will change a single row:(There is no difference between this and changing multiple row only need to retrieve multiple objects and change them) You will notice an interesting thing here, we didn’t have to use any extra method to tell Data Context object to notify the changes like ‘Insert On Submit’ or ‘Delete On Submit’ methods before . For more information, see Customizing Insert, Update, and Delete Operations. foreach (Order ord in query) // Submit the changes to the database. Order ID = 11000 _ Select ord ' Execute the query, and change the column values ' you want to change.

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