I think you need to change your instance name. For example : Scaffold-DbContext “Server=PC\SQLEXPRESS;Database=***;User ID=sa;Password=****” Microsoft.EntityFrameworkCore.SqlServer -OutputDir model So your instance in this case is : PC\\SQLEXPRESS. This instance should be like this : .\SQLEXPRESS
Need to install some NuGet on your NuGet administrator microsoft.EntityFrameworkCore microsoftEntityFrameworkCore.Tools Microsoft.NETCore.App Pomelo.EntityFrameworkCore.MySQL After having all your NuGet, you need to apply this to your Package Console Administrator: Scaffold-DbContext “Server=localhost;Database=database_name;User=root;Password=123456;” “Pomelo.EntityFrameworkCore.MySql” -Outputdir Models This will create a context for all your models and will also create some models for your data base.
The “Update Model from Database” is hard/slow to use and is prone to errors. It generates other stuff that you probably don’t want/need. So manually adding the column that you need will work better. I suggest you do it outside the VS editor since depending on how many models/tables, it can be very slow opening … Read more
I think your problem is, that your T4 templates, which generate the entitties and the context are still in EF version 5. First you have to delete the current code generation items, which are in the code behind of the model, namely <Modelname>.Context.tt and <Modelname>.tt.Next add a new EF version 6 code generator with Right … Read more
Based on this answer by DaveD, these steps address the issue: In your .edmx, rt-click and select Model Browser. Within the Model Browser (in VS 2015 default configuration, it is a tab within the Solution Explorer), expand Function Imports under the model. Double-click your stored procedure. Click the Update button next to Returns a Collection … Read more
In the latest bits it is possible to use the dnx command prompt and PowerShell commands to do this, yes Scaffold-DbContext ‘<connectionString>’ EntityFramework.MicrosoftSqlServer or dnx ef dbcontext scaffold “<connectionString>” EntityFramework.MicrosoftSqlServer or (from EF Core RC2) dotnet ef dbcontext scaffold “<connectionString>” Microsoft.EntityFrameworkCore.SqlServer You must install the Microsoft.EntityFrameworkCore.Tools package for the command to work.
The Entity Data Model Wizard’s Code First from Database does an excellent job creating your entity classes, as if they were created in the Code First style. What you are asking is if there is any way to keep these classes up-to-date as your database changes, similar to the EDMX style “Update Model From Database”. … Read more
It should be possible to use the identity system with POCO and Database First, but you’ll have to make a couple of tweaks: Update the .tt-file for POCO generation to make the entity classes partial. That will make it possible for you to supply additional implementation in a separate file. Make a partial implementation of … Read more
You’re trying to update the record (which to me means “change a value on an existing record and save it back”). So you need to retrieve the object, make a change, and save it. using (var db = new MyContextDB()) { var result = db.Books.SingleOrDefault(b => b.BookNumber == bookNumber); if (result != null) { result.SomeValue … Read more
I think the differences are: Code first Very popular because hardcore programmers don’t like any kind of designers and defining mapping in EDMX xml is too complex. Full control over the code (no autogenerated code which is hard to modify). General expectation is that you do not bother with DB. DB is just a storage … Read more