part 6 how to seed database with test data using entity framework

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seeding a database with test data using entity framework (ef) is a crucial step in setting up a development or testing environment. this tutorial will guide you through the process of seeding data into a database using entity framework core, including a code example.

prerequisites

1. **.net sdk**: ensure you have the .net sdk installed on your machine.
2. **entity framework core**: if you haven't already, install the necessary nuget packages for entity framework core. you can do this via the nuget package manager or the command line:


3. **database provider**: this example assumes you are using sql server, but ef core supports various database providers.

step 1: create the model

first, create a simple model class. for example, let’s create a `product` class:



step 2: create the dbcontext

next, create a `dbcontext` that includes a `dbset` for the `product` model:



step 3: create the migration

to apply the changes to the database, create a migration. open your terminal/command prompt and run the following command:



this command will create a migration file in the `migrations` folder. you can inspect this file to see the generated code for creating the `products` table and seeding it with data.

step 4: update the database

now, update the database with the new migration. run the following command:



this command will create the database (if it does not exist) and apply the migration, creating the `products` table and inserting the seeded data into it.

step 5: verify the data

you can verify that the data has been seeded by querying the database. you can use sql server management studio, or you can write a simple console application to read the data:



step 6: re-seeding data (optional)

if you want to re-seed your database (for example, during development), you can add the `ensuredeleted` and `ensurecreated` methods in your `program.cs` or wherever you set up your application:



this will drop the existing database and create a new one, appl ...

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