ef-model-first

I have setup a system where I have taken the model first approach as it made more logical sense for me. Now when even I have some changes in the model currently what I do is - Use the Generate database from model feature of entity framework. I create a dummy database and apply those scripts. which deletes all my data and tables first and then updates the database with the latest sql file which is generated by entity framework. Now I use the Visual Studio's schema compare feature and generate migration scripts for my local database and also for the one which is in production. I go through the

In Entity Framework 5 model first, there seem to be some breaking changes due to the way the class files are generated (No more code generation, but T4 templates) 2 examples: The generated context file doesn't implement IDisposable anymore There isn't a constructor which takes a connectionstring anymore Are there more breaking changes? And what is the solution to them? The default code generated from a model in Entity Framework 5 now inherits DbContext instead of ObjectContext. This still implements IDisposable, but if you're getting an error from a line of code similar to this: using (var

I have been using Entity Framework model first since VS 2010. When I build my project, EF generates a Model.Designer.cs file containing all entities. This designer file also contains the documentation added to the entities in the EDMX file. When I created a new EF model first project in VS 2012, a Model.tt file is added to my EDMX file. This T4 template generates a single file for every entity in my model. Unfortunately, the documentation from the EDMX file is not used in the generated code. I really like having my model documented so IntelliSense shows up when using it. The only workaround I

I like the option of doing model first design with the Entity Framework (4). However, I haven't been able to find out how to add an additional index to a table besides the primary key. Is this possible in the visual designer? Or do you need to add an index manually after creating the database (which would be a shortcoming of the designer)? Read this article . Section Influencing the DDL Generation . HTH 来源： https://stackoverflow.com/questions/3333674/add-index-in-ef-model-first-design

I have an existing model and initially generated the database from this model and had populated the existing tables with some data. Now I've added a new table to the model. Is there a way to update the database from the new model without losing all the data in the existing tables? Thanks. EF's default database generation workflow creates a full script that will recreate your database every time you select Generate Database from Model... so if you execute it in your DB you will lose all your data. However, if you just create a new Entity and did not change the existing ones, then you can still

Similar Questions The entity type <classname> is not part of the model for the current context -and- EF 4.1 Code First error - The entity type SomeType is not part of the model for the current context are similar questions but they are "code first" perspective only, with much simpler data models, and address connection string and mapping issues. Please look closely at this one. Symptom // HomeController.cs public ActionResult Index() { var _db = new MealsContext(); var m = _db.Meals.ToList(); var d = _db.Drinks.ToList(); return View(); } Exception is thrown retrieving the Drinks collection:

I know this question has been asked numerous times before as I’ve read quite a few posts on the topic about the pros and cons etc but I still can’t decide which approach is right for me. I’m very new to web programming and come from a SQL DB Admin / report writing background. I’ve decided to try build my own website which may end up having 30 -40 tables maybe more in the future. I’ve looked at both approaches and I do favour Entity Model approach only because I like simplicity of the designer and I like seeing the whole model in front me, it shows the overall picture in one snapshot. Also, me

I give up. I found this: http://blogs.msdn.com/b/adonet/archive/2011/03/15/ef-4-1-model-amp-database-first-walkthrough.aspx And thought, that's cool. So I quickly redesigned my model to take advantage of best of two worlds. But now my model fails at creating new database (or adding tabls to existing one). I get this error: Code generated using the T4 templates for Database First and Model First development may not work correctly if used in Code First mode. To continue using Database First or Model First ensure that the Entity Framework connection string is specified in the config file of