I generated an .edmx file from database.
I want to know if I make changes to my database schema then how will those changes be reflected in my Entity Data Model Designer diagram? I made changes to my database schema but found the changes did not appear in my Entity Data Model Designer diagram. Can someone explain to me how to propagate database schema changes to my Entity Data Model Designer diagram?
I think what you are asking is if you change your schema, how is this then updated in your EDMX file?
Open your EDMX file in Visual Studio
Right click on the design surface
Select 'Update Model from Database'
Follow the wizard to 'Refresh' your
model.
Your changes should now be visible on the design surface in the respective containers.
so i want to know if i add or remove
any field from table then how change
will be reflected in my Entity Data
Model Designer where diagram show.
Additions in your tables will be reflected in your model if you "Update Model From Database" as posted in the other answers. If you delete tables or columns though in my experience you have to remove the corresponding entity manually from your model and then update the model from the database.
Right click in the edmx, click "Update Model From Database". Go over to the "Refresh" tab, and click "Finish".
You need to open up your model and right click on an empty space and select Update Model from Database...
When using 'Update from Database' you can also select whether to add new tables from your database if required, or leave them out.
Related
I am using Entity Framework version 4.0, I want to delete one column from the .edmx model. Because my development database contains one newly added column and my server database still doesn't have that column right now. So how can I solve this issue while publishing my code to my server?
You should always have a version of the published code and the database model that belong to that code.
In the model, if you select the column in the table you can right click and choose "delete from model" which remove the column
The Entity data model can not be auto-updated so when making changes on the database you have to update the .edmx by :
Right click on the diagram -> Update model from database -> select 'Add' then 'tables' finally on button 'Finish'.
Tell us if it's resolved.
I am opening the WebStoreDBModel.edmx file. Inside of the file I right click Update Model from Database. There I am in the ADD tab, but I cannot select the TABLES or anything else (Views or Stored Procedures and Functions). I have a dababase with 3 tables connected together (Category, Cart, Product). Can someone explain me why I am not able to regenerate the model ? I need to regenerate because When I am trying to Add a new Controller it display No Model Classses are available. Please check that the project has been compiled. I did DEBUG / BUILD my project. Any idea ?
If you haven't created any new objects( tables/functions etc..) since you created the EDMX file for the last time,then "Add" tab won't allow you to select anything. You need to use the "Refresh" tab.
If you added a new column to the existing table/updated a column in an existing table, You should use the "Refresh" tab.
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'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.
I am using ADO.NET Entity Data Model in my C# project. There is an ADO.NET Entity Data Model that is generated on the DB in my project. How do I quickly refresh the ADO.NET Entity Data Model based on DB changes? I have been deleting the model and then creating a new one. I believe that there is a more simple and quick way.
Right-click on the model designer and choose "Update Model from Database", and a dialog box will pop up. Click OK and your model will be refreshed.
FYI, I'm using EF 4.0, and I skipped the earlier version, so I can't tell you what it's like in VS 2008.
Update Model from Database doesn't work very well. At least in VS 2008/C# 3.5. I fails to remove old columns, etc.
I always Ctrl-A (to select everything), the press delete, and then create model from database from scratch - update just doesn't work right in a lot of cases. At least in EF4 / VS2010 that I am developing in/with.
Perhaps this helps... Update Model Wizard (Entity Data Model Tools)
You should open your Model.edmx after that right click on the properties. now select the (Update Model from Database) and it will going to show you another panel with tab panel. you can choose Add,Refresh and delete. in your current situation, you should select Refresh. then select Tables->dbo->and name of your table in database and then click finish. that's it. you've refresh your table.
but sometimes you can see in your model that something went wrong because the column is not in right position. to solve that just right click the column name and select 'UP' to move it up or 'DOWN' to bring it down.
i hope that it will help.
Right click - Update Model from Database.