Is there a way to synchronize local storage with Entity Framework?
What I'm thinking about is for example the following:
A user is completing a wizard in her browser. All necessary data is stored and validated localy based on the entities and validations defined in Entity Framework. In the last step, all this data is transfered from the browser to the server and saved to the database (by EF).
Is there a library for this? Is it even possible at all?
You could use Breeze. This will let you create entities in javascript and sync them with EF.
Related
I have a Web API that uses Entity Framework and an Angular SPA. I get an entity and pass it to the SPA, but then I get a DTO back from the SPA into my API. Now what is the best way to check to see if the data has changed by someone else?
One possible scenario is to send the original entity along with the modified entity and do a select by the columns I am modifying. If no rows are returned then the data has changed. This might work, but I wanted to see if there is a better way of detecting changes; especially in the case that the data itself is not in an entity but in a DTO.
Thanks.
I am new to Entity Framework. I have created an EF Model and successfully added some tables and relation. Then I Clicked Generate Database from Model and My DB has been updated. Then I renamed some columns and I don't know how to revert or apply the changes. And Update Model from database does not seems to work because the columns names are different yet.
I need to graphically sync DB with Model. I prefer the model data rather than db data.
Thanks in advance.
You might want to look into the Code-First approach of Entity Framework. Using that approach you'll define your model in your code, and when changing anything you can create a Migration which allows you to up- and down-grade the DB to a specific version from the package manager console (or just create the respective SQL scripts).
For more information on this subject please see this article on MSDN
Note that you can also reverse engineer the code first model from an existing database (see 3. Reverse Engineer Model in this MSDN article), and then enable migrations for that model (see Step 2: Enable Migrations in this MSDN article)
What I do when I make "updates" is do it on both sides manually, in db and then in model (by right click properties) if the change is small. If adding a "new" table I drag it over to model from db server connections panel.
The alternative I've seen others prefer to use in this cases is to stay away from Entity Framework and use Dapper where you pass queries to it and it handles the rest.
Dapper (Wins!) vs Entity Framework vs ADO.NET Performance Benchmarking
I have an existing database and I am operating on data inside it via a .NET C# application using ADO.NET currently. I am suggested to use Entity Framework model. However, I want to add some stored procedures and tables to the database and use them when the compiled application runs. Can I create entity-framework model for current database without these to-be-added stored procedures and tables and then add those during runtime when using the compiled application?
Is it possible with entity framework model? Can someone give me some pointers about how to do this? I am new to entity framework.
I have a WCF application in C# .NET 4.0. I made all my entity classes and can query a sample from the WCF. The sample is just hard coded values.
Now I am ready to persist these in the database. I am lost on how to approach this though. I plan to create tables for each entity class I created, but what is the best way to add the persistent data layer to my existing WCF application. Is Entity Framework a good choice for this? Thanks for any help or suggestions.
What I suggest is to use entity framework code first. It prevents you from re-creating the model/database by hand. Just set it up so that your current entity classes are mapped to the entity framework and it will automatically create the database for you.
If you google entity framework code first, i'm sure u cant miss it.
I have an application where I create database's dynamically in a SQL Server using Server Management Objects through my application.
I want to use the Entity Framework to access this database when it has been created, is this possible? As I can not generate Entity classes from a database in VS. I do have the structure of the database of course.
So is it possible to create the Entity classes manually and is that a do-able task?
Yes, it's completely possible. You can even manipulate the generated code if you want.
What you might want to take a look is the EDMX XML specification.
In that file you specify the underlying database, views, functions, procedures and the like, as well as the desired objects. Take a look at MSDN in order to have more information.
Paulo is right for EF 1 (+1). For EF 4, I'd suggest using code-only modeling instead.