数据库更改时如何在数据库优先方法ASP.NET“核心”中更新模型（添加了新表）

Question

I am using ASP.NET core 2.0 MVC template and have a couple of issues:

i)I generated the models by scaffolding using database first approach given in MSDN Documentation . But now I have added a new table (Employees) and wish to include that table as a model. But when I run this command :

Scaffold-DbContext "Server=server;Database=db;Trusted_Connection=True;" 
Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models -Table Employees - Force

then it overwrites my previous dbcontext class(removes all previous models and adds only Employee in it).How can I add only model related to that new table only keeping the previous models as such.

ii)similarly I can't figure out the way how to update a existing model if the table corresponding to it is modified(added new columns using sql server).If I scaffold then it erases all the code written in that model class earlier.

I can't find out any proper documentation for database first approach apart from the MSDN one which doesn't deal with updating the models when underlying DB changes.

Thanks

Answer 1

You must delete the first one model and create a new, re-scaldfold all that you need

delete Model.Context.tt, Model.tt, Model.edmx

delete Entities string from Web.config

Create the EDMX and Context files the same way you did for the first tim

as @Valuator that is for Code first method