ASP Net Core MVC with EF Core Migrations in Visual Studio 2017 (4 of 8)
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🚀🎓 Next: • Don't Putup With Instance Error Updat... ++++++++++ (Unit Testing Blazor ASP.NET 5) -In this tutorial, the EF Core migrations feature for managing data model changes is used.
When a new app is developed, the data model changes frequently. Each time the model changes, the model gets out of sync with the database. This tutorial started by configuring the Entity Framework to create the database if it doesn't exist. Each time the data model changes:
The DB is dropped.
EF creates a new one that matches the model.
The app seeds the DB with test data.
This approach to keeping the DB in sync with the data model works well until you deploy the app to production. When the app is running in production, it's usually storing data that needs to be maintained. The app can't start with a test DB each time a change is made (such as adding a new column). The EF Core Migrations feature solves this problem by enabling EF Core to update the DB schema instead of creating a new DB.
Rather than dropping and recreating the DB when the data model changes, migrations updates the schema and retains existing data.
The tutorial is based on this Mictrosoft link:
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