I added a new table to the database. In the .edmx (where database diagram is at), I right-clicked and chose 'Update Model from Database...'. I can see the new table's diagram has been generated, but how do I add model to EXISTING .tt? I know I could do it manually, but I would like to know how to generate it automatically. Thanks.
EDIT: I got the model class by clicking around. I think it was right clicking on .tt then 'Debug T4 template' which generated it. But can anybody explain what did this Debug T4 template debug?
Related
Assume that I have added a product table into sql server DB. How to generate product class to existing edmx file?
you have to update your edmx file right click on the screen and Click on Update Model From Database. then a window will come select you table from the tables and follow the wizard.
when you finish the wizard then you will find your selected table entity in the edmx and the generated class will b in yourmodel.tt file
then you have to go to the youmodel.context file and make property for the new class like
public DbSet<yourClass> ex { get; set; }
and then you good to go
for ref follow the Link
Whenever you add a new table to you database, you need to update you Edmx. For that simply open you edmx and right click --> select update model form database and select you newly added table and then click finish. Your model will be updated and new classes will be automatically added.
I attempted to update my edmx file by selecting a table. The tool spit out a info message that said the table did not have a primary key.
The entity did not get added to the design surface but it did get added to the .edmx file. In addition, using the model browser I see an Entities.Store and an Entities. My table got added to Entities.Store, but not to Entities.
I cannot access the table that was "added" in the code.
What do I do?
Steps to reproduce:
Create a SQL table with two columns that are both defined as foreign keys to other tables. Make sure the tables that the FKs point to already exist in the model on the design surface.
Right click and choose Update Model from Database...
Next. Under the Add tab, mark the new table under Tables
Click Finish.
An association will be created and it will be selected on the design surface, but it won't start with FK_, it will just be the name of your table. Go to the Model Browser and look under Entity Types. The table will not be there. Look under Associations and you will see your table name there as an association, but it will look out of place (because of the name).
Entity Framework was too smart for me. It created an association instead of an entity. Odd, but it works for how I need to use it.
I have a model generated from db with Entity Framework. When I have any change in database, I update model from database to get the change in model. But this update is applied to all entities (tables) included in model.
Now I add a new column in a table Tab1. I don't want to update model from database as some other changes that I don't want to include in model. I can add the new property in model for entity Tab1 manually. then it caused mapping error.
So I need to update Model.Store for the table to include the new column. It means I want to update model only for Tab1.
How can I do this?
The EDMX file is an XML file that is a combination of 3 different parts that make up the whole thing. If you right-click on your EDMX file and choose "Open with... XML Editor" you'll see the 3 different sections:
<edmx:ConceptualModels>
<edmx:StorageModels>
<edmx:Mappings>
These sections can be edited manually, at your own risk! :-)
That way you can modify only what you need to.
Note that it's also possible to generate CSDL, SSDL & MSL files rather than having them embedded in the binary file, by changing the "Meta Artifact Processing" property of your model to "Copy to Output Directory".
If you don't want to do this manually, there's the Huagati DBML/EDMX tool, it is free and you can download it from huagati official site or from visual studio gallery, which is a Visual Studio plugin that allows you to select what changes need to be done.
I use following (Conditional) trick. This could be done only when no Table depends on the table which you want to update.
Delete the table which needs to be updated.
Right click on Model and select 'Update Model From Database'. The Table would be shown in the tab 'Add'. Select this table and Update the model.
Precaution : If other existing tables have changes in them, EF would update these changes as well.
There is way of doing it automatically.
right click edmx file > update model from data base > Refresh tab > Tables > select the table(you want to update) and press finish that's it.
Seemingly simple thing got me completely frozen and I can't find anything on the Net about this:
I had a common many to many relationship in my db:
Table One + TableTwo + LinkingTable with 2 columns: TableOneID and TableTwoID
I deleted the LinkingTable and tried to update the model from database. Now I get error "Error 11007: Entity type 'LinkingTable' is not mapped."
Does anyone know what exactly this EF wants? Thank you!
Right-click the Model in the Solution Explorer. Select "Open with..." Select "XML (Text) Editor" in the dialog. Remove all nodes and references of the LinkingTable (or whatever its real name is) from the model's xml. Close all model files that are currently opened (I know, weird). Build the project. Open the model again. Everything should be fine now.
Open Model Browser,
In the Entity types, select the table which is to be deleted,
It will remove all the associations with the table.
It worked well for me.
I'm getting a weird EF4 "Entity Framework v4" error when I do a select on the context:
Schema specified is not valid. Errors:
The relationship 'AnalyzerConfigurationModel.FK_AnalyzerMetadataParameters_AnalyzerMetadata' was not loaded because the type 'AnalyzerConfigurationModel.AnalyzerMetadataParameter' is not available.
The query to generate the error is:
Using context As New AnalyzerConfigurationEntities
Dim EFAnalyzerConfiguration = (From P In context.AnalyzerConfigurations
Where P.Name = analyzerConfigurationName).FirstOrDefault
End Using
The schema is show below.
I've checked the connection strings, multiple times, its not that. Everything looks fine. I'm not sure if the XML that gets generated from this schema is off or not. But looked there too and don't see anything off or different from other properties. Has anyone run into this one before?
I found that if I expanded the EDMX file in solution explorer (VS 2012) and right clicked on each .tt file and selected Run Custom Tool also fixed the issue. This might be easier than de
Also make sure you're referencing project has the EntityFramework installed otherwise the dependent code will get this error.
https://www.nuget.org/packages/EntityFramework
Let me explain this:
The problem is because the system did not find consistency of the columns in database, the entities in the .edmx file and the model class and also the use of the same in the controller class.
So follow the following steps to fix this up:
Go to the database, check all the column names and properties.
Confirm them with the class diagram in the.edmx file. Right-click on the class in which you are getting the error, and select update option for the class. Select the Refresh tab in dialogue (if there is no new column added. if new column is added, you can select the add tab.) and select the relevant objects. Generally they are tables. So select them and finish.
Next check the names in the model class and the controller class.
This should be the solution. If not, let me know.
Are you using the SelfTracking Entity T4 template? I had this issue and found out the T4 template was not re-generating my entities after I had changed the Entity model in the Entity Designer. Try to right click the T4 Template and click "Run custom tool", and see if that helps.