Updating data with linq
My test category - My test subcategory 1 cb3dde89-7036-4556-beae-75af64887405 - My test subcategory 2 3c431004-1787-422a-b906-d7351010247e - My test subcategory 3 9ec94df7-4672-429d-9329-f3714d9b1ed2 After update - My test subcategory 1 cb3dde89-7036-4556-beae-75af64887405 - My test subcategory 3 9ec94df7-4672-429d-9329-f3714d9b1ed2 - My test subcategory 4 3de7c063-ae79-4047-a516-40e28daf1439 If I want to match on the rowguid instead I use item.rowguid in the key generators and I also need to include the GUID in my business objects.
I use anonymous types for brevity here, but in a real application this is typically a DTO class or a class from your business layer.
Your application is free to manipulate the objects while LINQ to SQL stays in the background tracking your changes automatically.
(119 printed pages) Introduction A Quick Tour Creating Entity Classes The Data Context Defining Relationships Querying Across Relationships Modifying and Saving Entities Queries In-Depth Query Execution Object Identity Relationships Joins Projections Compiled Queries SQL Translation The Entity Lifecycle Tracking Changes Submitting Changes Simultaneous Changes Transactions Stored Procedures Entity Classes In-Depth Using Attributes Graph Consistency Change Notifications Inheritance Advanced Topics Creating Databases Interoperating with ADO.
The most straight forward way to solve this is to clear all old items in the collection in the database and generate new items.
Sometimes this is not possible when you have foreign key constrains and rows in other tables referring your collection items.
I've traced it and it it's sending the correct model and iterating through the table with the correct data and the AJAX call is successful, but the data is still the same data. As you are only getting data for the table and for the dropdown and not changing anything in the database, you can do a get request.
One that has a few dropdownlists that I'm using as filters and the other is a table that displays database info: My View: What I'm trying to accomplish is when an item is selected from the Categories drop down list, I want to first update the second drop down list via AJAX (which is working) and next, I want to update the table with my data. few things to mention where you can improve your solution.
I think this is enough code to make sense of what I'm doing, but if more is needed just let me know and I can post it up as well.After upgrading to Visual Studio 2008 RTM, you will have trouble updating Linq to SQL Classes which are read from one data context and then updated into another data context. As of now, the application runs perfectly and does exactly what I need it to, but the problem comes in when a large data set is reviewed. Pad (download here) is a GUI tool a bit like LINQPad, except it only works with Simple. To use it, extract it from its zip archive onto a local disk, and run Simple. method, and you can enter the parameters in the text boxes that appear when you've chosen one. v220.127.116.11 is in no way anywhere near production quality. It won’t kill you, though, or do bad things to your database, although stick to data retrieval queries for the time being. Data was created by Mark Rendle ( Six plug-ins have been additionally created Vagif Abilov has made a set of wiki pages available at Git Hub describing how to use his Simple. The drop-down at the top left lets you choose an Open... Pad comes with the Sql Server assembly, but you can drop any of the other adapter or provider assemblies in the app folder and it should pick them up. As you type, you should get an autocomplete box showing you available methods and properties, generated from the schema of the database you’re connected to. The Trace tab should show the SQL that was run against the database for the most recent query.