I'm using EF5 with C# and SQL Server 2012. We're using database first. I made some changes to the database, added a couple views and a few table columns.
When I go into the edmx file in Visual Studio 2012 and select Update Model From Database everything is shown in the model view. The new views are present as well as the new fields.
But none of the new elements propagate into the auto generated model.cs file. I've updated the model from the database multiple times and rebuilt the solution many times as well.
Is this a bug? Is there a workaround?
Right-Click on the tt-files (one for the dbcontext, and one for the containers) that is connected to your edmx-file. Click "run custom tool". This will rebuild your containers
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I've created a database from scripts using Microsoft SQL Server 2019 and generated some classes in C# using Entity Framework. Now I've had to modify and add a number of new items to that database, including stored procedures and new tables.
However, on trying to regenerate the classes in Visual Studio 2019, the Entity Data Model Wizard is still showing the old database (the way it looked a week ago), including some tables I deleted. None of the new stuff is listed. I've tried deleting and recreating the database, restarting both programs, and restarting the PC to no effect.
The steps I'm taking to generate the framework in Visual Studio are:
Add a new item to the project.
Select ADO.NET Entity Data Model.
Select Code First from database.
Select Next (the connection string is already filled in).
The next screen is the "Choose Objects and Settings" window, which is where I'm still seeing the old tables (and not the new ones).
Is there some special step I need to take after changing a database to get those changes to show up in Entity Framework?
I have a question. I have a project that uses an edmx and all hooks up fine to the sql server.
I have installed it in several servers.
What I want to know is, having made changes in development so m database and my edmx are change,s say a new table and a modified one.
How do I make it so these updates are aplied automatically when I publish an app update?
I remember once a long time ago doing code first database work and making some kind of file or procedure that would automatically apply these changes when the app ran.
Can any one fill me in again.
1.- AFAIK, when you're using model first or database first, you can't use Migrations, you generate a DDL script that when executed, creates the database or drops and recreates tables losing any data you had.
See This link read point number 5.
"The script that is generated will drop all existing tables and then recreate the schema from scratch. This may work for local development but is not a viable for pushing changes to a database that has already been deployed. If you need to publish changes to a database that has already been deployed, you will need to edit the script or use a schema compare tool to calculate a migration script."
What I do here, is make the changes to the database and update the model (Right click edmx designer, click "update model from database")
2.- You can configure updates on a ClickOnce installer, any changes made to the edmx will be published on your app.
i'm new to MVC and have to update my model.
I have an SQL Server database already connected to my project, today I add a new column. Now I need to update my MVC code to reflect the change.
Everything online tells me to update the .edmx and .tt files with the Update Model Wizard since they are auto generated, but I cannot find the wizard in VS 2012 so I am at a stand still.
Is this the right way I should be doing this? Any tips would be great...thanks
There are a couple options you can do:
If the database is empty or there isn't a lot of data that you care about, you can drop the database and recreate it.
Manually add the column in the database (after property is in model)
There is something called Code First Migrations. This will allow you to update your database. Here is a tutorial you can look at for this: http://msdn.microsoft.com/en-us/data/jj591621.aspx
Double click the edmx file. This opens the diagram of the database model.
Right click and select "Update Model from Database..."
That will start the wizard you're looking for.
Be aware that not all changes come through automatically.
Most obvious is that columns will not be removed from model just because they're gone from the db. If you're dealing with lots of modifications or deletes rather than additions, it may be best to just drop the model and recreate it (as suggested above by Andrew).
No matter which approach you take, I'd suggest making sure you have all other local source changes committed or shelved before starting because you may need to do an undo check out if EF gets freaked out.
I ended up downloading this update of VS 2012 and repaired. Now I am able to update my model.
I can't understand how to manage database with Entity Framework.
I'll try to describe my problem step-by-step
create winforms application
add database (.mdf) to solution
when appears window "choosing database model", select dataset
then finish, as database is empty
go to server explorer, choose created database, create some tables
add to solution EDM ADO.NET
The problem is that new data doesn't appear in my database in server explorer. This means that while my Winforms app is working, I can modify my database (change existing values, add new, ..). but if I close my app, there is no update in my database in server explorer. I DON'T forget to use function SaveChanges()
P.S. while my app is working, values are updating. Think, that means that data updates in dataset, but not in database. if i am right, give a clue how to update database from dataset.
pps. visual studio 2010 ultimate. sorry for english
dbentity db=new dbentity();
db.items.addobject(new item() {value=something});
db.savechanges();
Don't add the database to your solution. You can use the Server Explorer to add a connection to your database via your existing SQL Server, or you can select your database in the wizard that appears when adding a new EDMX file to your solution.
Did you try either of these? Where did you get stuck?
I'm newbie with .NET Entity Framework 4.0 I'm using VS2010 and I created the EDMX file and then added my Entities in this model. After I've finished my Datamodel and set the Asscociation, I right click on and choose Generate DB from model.
Then it creates SQL scripts *.sql then I open the SQL and right click on Execute SQL Statements... What happens is all my tables are re-created...
ISSUE: All my test data in MasterData Tables are removed/deleted. I need to add the data back again manually...
I googled on "keep data generated Data model EDMX" etc. but couldn't find... Can someone advice me how I can avoid this problem?
Because I've e..g 15 MasterDataTable + other tables linked with these and I need to re-add the records back manually for all these tables... and 9 of 10 case I don't touch those tables in UI.
please advice how I can avoid this situation.
thanks
You can update the model from the database (the reverse way you are taking now):
Double click the .edmx file to open the designer. In the middle of the designer, right click to show the contextual menu and click "update model from database". It will prompt a screen, check the DB parameters and click next. Now, you're in a sreen with TABS. The first tab is for adding tables as entities to the model. The second tab will its for update the model. Select the tables and views you need to add/update and click next. That's all.