As stated in this tutorial, I can scaffold code-first EF Core from an existing database using Scaffold-DbContext in the Package Manager Console.
It's all good but my problem is that it scaffolds separate class files for each table and another for the context class. I find this a bit messy if I have too many tables.
I can rearrange it all by hand but Is there a way to scaffold everything to one class file? Or maybe having the context class on a separate file and then group the tables to another file per schema.
This behavior is not an option of EF Core scaffolding as of 1.0.0.
Related
Whether the steps are the same as for the first time? Is it good to use the -force command to change the old state?
Using Scaffold-DbContext command or dotnet ef dbcontext scaffold command could help generate code for a DbContext and entity types for an existing database.
If you'd like to generate entity types for specific tables, you can set -Tables <String[]> parameter, like below.
I have a project that coded with DotNet Core code first.
Now, there is a lot of real data on the database and i have to add some features with many tables and new relations to this project.
How can I apply these tables and their relations to the Database without adding manually?
Is there any way to use Add-Migratiosn and Update-Database to apply new changes via EF core instead of manually applying?
If you have not many changes to your DBContext you can remove it and use Scaffolding to create new DbContext from the existing database schema. You can find more information in the official Microsoft documentation here.
It is better to use only one entity framework database approach either Database-First or Code-First.
I am trying to locate the Entity Data Model Wizard that allows you to populate the database schema into a DatabaseModel.edmx file so I can create my model based on that.
I've included the EntityFramework dlls into the project.json file but not too sure if in this new version of ASP.NET MVC this wizard is available anymore...
I've seen that the scaffolding that generates the Model classes is done through command line now but not sure if that has anything to do with the wizard I was talking about above.
Thanks!
"Prior to EF7 there are two ways to store models, in the xml-based EDMX file format or in code. Starting with EF7 we will be retiring the EDMX format and having a single code-based format for models."
Source: http://blogs.msdn.com/b/adonet/archive/2014/10/21/ef7-what-does-code-first-only-really-mean.aspx
Hello how can i access the entities generated by entity framework from front end?
from my business logic i can access it but i can't access it from frontend.
Can i move the entities from entity framework project to business logic layer or replicate them in it?
I think there should be an easy way to do it, because i can't belive microsoft has developed a pattern in whitch data layer should be referenced directly by ui, it is a thing people do when they are 8 years old
I will walk you through this from the Entity Framework 5 / VS2012 perspective. However other versions should work similarly.
Assuming from the above you have three projects (data/business/ui) and a entity framework context (.edmx) item in your data project.
Create a new project (class library) for your solution. This project will house your entity (POCO) objects so name it appropreatly.
Create a project reference from your data project to your new entities project
Create a new item in your new project (EF 5.x DbContextGenerator)
Delete the Context.tt file in the newly created item.
Open the other .tt file and modify the line that defines inputFile to map to your .edmx file
const string inputFile = #"../<dataprojectname>/<mydata>.edmx";
In your data project expand out "mydata".edmx and locate the entities template named "mydata".tt (you will know it is the correct one because it expands to show a list of your entities) and delete it.
Modify the "mydata".Context.tt file: scroll down until you see the using statments. Append the list of usings with the namespace of your entities created in step 3.
Now you can create references from your business and UI projects directly to your entities project.
Hope this helps.
I've installed EntityFramework through nuget (should I do this for every project? Or can I just reference the assemblies? Where are they 'installed'? Sorry new to nuget)
I add a new "Ado.NET Entity Data Model" to my project and import tables from the database. However the context is added as ObjectContext not as the latest DbContext as I would presume. Am I missing something here?
Yes, install the package for each project. The assemblies are installed in a packages folder in the solution folder.
The ADO.NET Entity Data Model is for Database First. Read an explanation of Database First vs. Model First vs. Code First here:
http://www.asp.net/mvc/tutorials/getting-started-with-ef-using-mvc/creating-an-entity-framework-data-model-for-an-asp-net-mvc-application
A great place to start is http://asp.net. Read the tutorials. They cover data access with EF for both WebForms and MVC.