We want to update a ADO.Net Entity Data Model programmatically, so that the EDM is getting the newest version of the database (new tables, values etc.). I want to have a complete update of all stuff.
I know that it is possible to update the EDM, by clicking in the Model Designer, Update Model from Database.
Do you know any solution?
Thank you in advance.
Related
The project uses dbfirst approach. On my database I create and edit tables , Then I update the models from the database (edmx).
Is there a way to solve the problem when my models are more relevant than the customer base? It is very important to solve this with the help of EF.
That is, I need to in the customer database automatically added new fields in the tables and created the tables themselves if they were not
You can use Visual Studio over your database model through the designer interface and them updated your database. However, it's a procedure i don't recomend you to do, because depending what operations you want to perform on your database after being applied can rise errors related with some specific types and other specific things and then the roolback could not be so easy.
I generated model from existing database in c# via entity framework, but when i change database (for example add column to table) application stop work, because in model miss the new column, but i don´t need the new column. Is there any solution to generate model from database, but do not be independent to change in db?
Thanks.
I have a problem - when I update the data model edmx, the entities are not up to date. See the image below:
Generally speaking if you are doing Database-First you should update the database and let the data model refresh (right-click anywhere in the .edmx and select Update Model from Database...).
Background
I am starting a series of simple screens to display and update info in our ERP database.
I have worked through the wpf controls and understand the need for Observable Collections and after reading around on Entity Framework I understand the advantages of it sitting on top of ADO.net compared to the basic SQL methods and Datatables I am more comfortable with due to my SQL experience.
When I tried EF when I was first started working with Data CRUD screens I struggled to get the Observable Collections I needed, but having read this walk through last night ( https://msdn.microsoft.com/en-us/data/jj574514.aspx) and seen the notes for VS 2010 to edit EF code to get Observable Collections I think I want to try EF again.
Question
My Data screen needs present information which has be combined from five tables and a couple of sub views to be meaningful to the user.
Included in the dataview is a simple Y/N flag which comes from one of the five Datatables.
Can the user update the Y/N flag through the view mapped to EF, displayed in WPF datagrid ?
Or do I have to map all the base Datatables and sub views and recreate the view and Data Context in EF to allow the update to work?
If it is the latter does any one know of any tutorials or walk through I can use on my test development to try EF please
Thanks
The user can update a field via the view mapped to EF, however it is a little bit more complicated.
For a single table mapped to EF, the update is done by EF automatically, for a view mapped to EF you need to define the update function in the mapping details.
The function would be in form of an SQL stored procedure mapped to EF.
I've designed the entity model which has been mapped from the Sql server database. Later on, I've updated the Identity column in a particular table in database then I've done Update Model fromDatabase.
Unfortunatly, It wasn't updated in my Entity Model. What should I do to sort it out ?
Any help or suggestion are greatly appreciated !!!
Manually edit the EDMX either in Designer or Xml view, whichever is your preference.