I'm using Entity Framework in Visual Studio and am working with an existing table and corresponding model. I have changed the table to allow null values for some attributes. However, when I try to update my model, it doesn't pick up the change.
I'm going into the model designer, right clicking my model, and selecting "Update Model from Database". In the next window, I see my table in the Refresh tab, but selecting it still leaves the "Next" button below grayed out. I can only click "Finish".
Any ideas on why this is?
I'm using Entity Framework 4 (I think), MS Visual Web Developer 2010, and working with an ASP.Net 3.5 MVC 2 application.
Clicking Finish in this case will update the model. Updating the model will update the storage model but not necessarily the conceptual model, especially if you are doing a refresh and the property / entity is not being added for the first time. You might have to select the property that is nullable and under its properties set Nullable to true.
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SOLVED: apparently this was due to a connection issue w my tabular model. I had to rebuild all of my existing tabular model connections to get everything to refresh properly.
I'm currently working with a power view excel sheet that's connected to a tabular model. I know that the sheet can be easily refreshed if it's linked to power pivot in excel, but I'm having a hard time getting my power view sheet to refresh after making changes in my tabular model. The only method I've found is to
(1) redeploy the tabular model in visual studio/sql server data tools
(2) open a new power view sheet and reconnect to the newest version of the deployed model
This is tedious and headache inducing. Is there a faster method for this? Can I
(a) get my power view sheet to reflect the changes in my tabular model (field list, data, etc) without redeploying it?
(b) refresh the data/field list on my current power view sheet without having to open another sheet and reconnected to my newly deployed model?
Thanks in advance!
I am trying to make a MVC 3 application that use Entity framework.I use Entity Framework Database First.I made an Sql Server Database with 2 tables ,then i generated with entity framework the model,classes .Then I added an other 2 columns to one of the table.How to update my MVC model with this colums?Exist an automatic way to do this (a command that i can runn to bring all the modifications in my model)?
Thanks
Are you looking at the designer or code view? You can force the designer to open by right clicking on your EDMX file and selecting Open With -> ADO.NET Entity Data Model Designer
Right click on the designer surface of the EDMX designer and click Update Model From Database...
All entities are refreshed by default, new entities are only added if you select them.
Select your xxx.edmx file.
CTRL + A to select all the tables, and then press DELETE to delete them.
right click UpdateModel, select your tabels, views, stored procedures, and include them.
CTRL + S to save and automatically generate the model partial classes
I've already checked the other questions and searched in google, but I found a lot of solutions...
What is the best?
I need to Alter the table when the DataModel changes, and I need an automatic Solution (like the DropCreateDatabaseIfModelChanges does..
Thanks a lot for all replies
You can go for CodeFirst Migrations. CodeFirst Migrations. You Need EF 5 binaries.
Run the Enable-Migrations –EnableAutomaticMigrations command in Package Manager Console
Add-Migration will scaffold the next migration based on changes you have made to your model.
Update-Database will apply any pending changes to the database.
To update the Entity Framework EDMX and sync it with your DB changes you double click on the EDMX in the VS2010 Solution Explorer. This brings up the designer (Model Browser window apparently is what it’s called) with a class layout of your entities. Right click anywhere on the designer surface and you’ll see an option in the dialog to “Update Model from Database.” Click on this and you get brought into the Update Wizard where you can choose the database objects you want to Add (if new), but by default it refreshes existing objects.
One thing the wizard doesn’t seem to do is delete columns from existing objects. Probably some sort of safety mechanism, but if you deleted the column from the database, do you really want to keep it in your entity? Ah well, who knows.
It don't works well all the time. In my case I try to create nothing manually with the model editor so each time I modify my database model, I open the EDMX editor, I select all entities and I delete them then, I right click the model and I select option : Update from database.
When the object list appear, I select all table and next. It update the model.
I have an existing MVC3 project using EF4 with a database first design. All entities and the edmx were generated correctly.
The problem is when I add a column to a table or make any change to my database. After making a change, I would go back to VS2010 and open my edmx file. When I right click and select "Update Model from Database" it shows all my tables under "Add" instead of showing only the changes I have made under "refresh". I have searched everywhere to find a reason for this but to no avail. Any help would be great.
I am using Entity Framework 4 with ASP.NET MVC 3.
I have a table, where one of the field called "ABC" was earlier of datatype varchar(100) I have now changed this to nvarchar(256).
Now to update this in Entity Framework, I have done the following steps.
Open .edmx
Right click and selected "Update Model from Database"
Refresh tab
Selected the table I wanted to refresh
Ok
However after doing these steps still in the Property window the "Max Length" shows as 100.
Can some one pls help me on this.
I faced this problem several times.
You can try deleting the ABC property in the edmx and follow the steps you mentioned. It worked for me.
It does not update maxlength of string properties, because the store is not updated.
You can either manually change it in your store, then press update in EF designer. Or you can delete the table, then re-add it and everything will be up to date.(drawback of this approach is that you will lose any custom made changes)
4 Years later and this problem persists. I find the easiest thing to do is to delete the .edmx file and regenerate it again for the cleanest and most dependable update.