I have a pretty large model built in EF version 1. The client wants to upgrade the model to take advantage of the foreign keys feature of version 4.
Is there any way/tool to easily convert a ef v1 model to ef v4?
You can just change the Target Framework from .NET 3.5 to .NET 4.0, and the model will be automatically converted.
However, if you need EF v4 features like Referential Constraints, you should recreate the model from database.
after converting the project to target .net 4, If your using the ef 4.1 code fist,
use this tool to recreate the entity classes.
http://blogs.msdn.com/b/adonet/archive/2011/05/18/ef-power-tools-ctp1-released.aspx
Im sure you are already aware that having an extremely large edmx model has its disadvantages.
If its not too late, use this chance to move to ef 4.1 code first and leverage the poco classes to give you more control over your entities..
My experiences have proven getting away from the edmx and moving to code first as early as possible pays off quickly.
You just have to ask your self the question, is the time required to retest all the Data Access Layer, worth the investment for your project.
Good luck
Related
I know EF Core is a complete rewrite from ground up. Wanted to know about the performance/memory footprint improvements made in EF Core compared to EF.
Am having a .net core 3.1 web-api, I will have to use Postgresql. Wanted to know whether using an ORM(like EF Core) is a good solution?
Or is there any other better data access technology(no ORM or dapper) which can be highly performant to access Postgresql in .net core 3.1 application?
I do not know if this is a valid answer as I am the author of this, but it is something that you may looking. Please have a look at RepoDB.
I have a database that I created using EF6. I have a VS project (library) that includes only my models and DbContext. Whenever I need to use my database I just reference that library DLL.
I have a few questions about that:
What happens if I lose this DLL somehow, but still have my models? Am I able to recreate my library?
What if I want to start using .NET Core? As far as I understand, I would have to use EF Core, right?. How can I get the same experience as I had with my DLL (same models).
When you still have the Code of your Models you can simply recreate the DLL. It gets recreated as you rebuild anyway.
You can also use the full entity framework together with .Net Core but that would make your application depending on classic .Net again.
The entity framework core works similar in many ways and also a lot of the old annotations work. You should be able to port you Model easily from EF6 to EF Core if it is not to complicated. Just be aware of some limitations regarding group by that will be resolved in 2.1
Because .Net Core is independent of the OS you won't be shuffeling around DLL's for you dependencys. One way is to use independet projects and release them as packages. So you can consume them in other projects with the package manager.
Is it possible to deploy / install Entity Framework Core 2.0 alongside traditional Entity Framework 6? Is it fully possible, or possible but with some hang-ups, or not possible? Is this documented somewhere? I think I've seen they said they designed it to be side-by-side, but I'm having a hard time fully confirming this. Thanks.
The official documentation says the following:
It is possible to use EF Core and EF6 in the same application. EF
Core and EF6 have the same type names that differ only by namespace,
so this may complicate code that attempts to use both EF Core and EF6
in the same code file.
If you are porting an existing application that has multiple EF
models, then you can selectively port some of them to EF Core, and
continue using EF6 for the others.
This means of course that you can install both EF6 and EF Core in the same project. I have done this in a few simple cases myself and it was working ok.
I'm trying to move an ASP.NET MVC 5 application to MVC 6 (ASP.NET vNext).
My existing application uses EF 6 and has some EF code first migrations. I want to port these migrations as well, because I want to be able to continue using the existing databases with the existing migrations already applied, without breaking the upgrade path.
It seems that the "new" EF Core migrations (k ef migration add ...) have quite the different format compared to the "old" EF 6 migrations:
No more Designer partial class
No more RESX file
Is there already an "official" way to upgrade these migrations? Is it supported at all? Will it be supported in the future?
There isn't really a way to do this yet. In general we strongly recommend against trying to upgrade an EF6 application to EF7 yet. EF7 is still very much pre-release.
We will have some guidance on how to do this when we get closer to RTM. We may provide some tools to help or just some guidance on how to do it.
Date: 13/April/2016
As of now it is not advisable to use EF7 in production because of following limitaions
"Because of the fundamental changes in EF7 we do not recommend attempting to move an EF6.x application to EF7 at this stage. If you want to move to EF7 to make use of new features, then make sure you are aware of the limitations of EF7 before you start. You should view the move from EF6.x to EF7 as a “port” rather than an “upgrade” ".
One area of RC1 that has a number of outstanding issues is our query pipeline. The majority of issues result in an exception when you attempt to execute a LINQ query that contains a particular pattern. There are often ways to workaround these issues by expressing the same query using different patterns, or evaluating parts of the query client-side. We try to include these workarounds in the issue, when they are available.
In RC1, there are a number of scenarios where EF7 performs slower than EF6
More Readings:https://blogs.msdn.microsoft.com/dotnet/2015/11/18/entity-framework-7-rc1-available/
Is there a template or tool to generate code from the database directly? I want to use model first scenario but do not want .edmx file for mappings. There is a database with many tables and I do not want to write all the classes (I am lazy) for that. So, is there a template to generate the code and set the annotations/use fluent api for defining the relationships, etc automatically from the existing database?
This would be helpful in the following scenario as well. Say, I was using .edmx with POCOs and now I do not want the mappings in the .edmx file. I want the mappings in the code. It would be great to have a tool or a template to generate the mappings in the code from the existing database.
I am starting on learning EF 4.1. I think "Code first becomes model first in version 2 i.e. after the database is created/released (in version 1) and needs some changes". Is that really true? I'd love to hear some comments. Thanks.
Check out the 'Reverse Engineer Code First' feature of the EF Power Tools CTP1 that was just released.
For generating classes, you can use POCO t4 template generation. Have a look at this detailed link which will help you getting started. That way you will get all the classes generated.
For mapping, you can use Code-Only style for Entity Framework but generating classes and context using POCO template will have far more advantage over creating the mapping yourself. Imagine adding new tables or modifying the tables, it will involve more work. But I will certainly love to know if there is any mapping tool for that.
It is possible that you are using EF-provider Devart dotConnect for Oracle when working with Oracle database. In this case the following information will help you to choose the tool.
The first version of Entity Framework Power Tools also contained the capability of generating a Code-First model with fluent mapping from an existing database. Although useful, this functionality is limited as regards its flexibility: the developer can only set the connection string; following that, classes are generated from all database objects available to the user. That is not extremely convenient, since in Oracle, for example, numerous schemas containing hundreds and sometimes thousands of tables are available to the user.
Rather than resort to this limited functionality, the users of Devart ADO.NET providers can avail themselves of impressively robust design-time development capabilities of Entity Developer, an EF-designer delivered with Devart providers. Also possible is the choice between the Database-First approach, as provided in EF Power Tools, and the Model-First approach, within which Code-First classes are created in the EDM-designer.
When compared to EF Power Tools, the Database-First approach to the development of EF Code-First models also allows selecting objects that must be available in the model, setting naming rules for the generation of class names and properties and so on. Besides, the resulting model can be modified and improved in the designer.
To better meet developers' needs, Code-First code generation in Entity Developer both for C# and VB is based on the T4-template that is easily accessible and can be modified in feature-rich T4 Editor contained in Entity Developer.
For more information on Code-First development in Entity Developer, see "Entity Developer – EF Code First DbContext Template"
http://www.devart.com/blogs/dotconnect/index.php/entity-developer-ef-code-first-dbcontext-template.html