How do I run EF migrations?

2020-02-19 by No Comments

How do I run EF migrations?

Open the Package Manager Console from Tools → Library Package Manager → Package Manager Console and then run the enable-migrations command (make sure that the default project is the project where your context class is).

What are the main dotnet EF commands?

Use “dotnet ef [command] –help” for more information about a command. As you can see above, there are three main EF commands available: database, dbcontext and migrations.

What is the migration command?

EF Migrations series There are four available main commands. Enable-Migrations: Enables Code First Migrations in a project. Add-Migration: Scaffolds a migration script for any pending model changes. Update-Database: Applies any pending migrations to the database.

What does dotnet EF migrations do?

The migrations feature in EF Core provides a way to incrementally update the database schema to keep it in sync with the application’s data model while preserving existing data in the database. Once a new migration has been generated, it can be applied to a database in various ways.

How do I enable migrations?

The first step is to enable migrations for our context.

  1. Run the Enable-Migrations command in Package Manager Console. This command has added a Migrations folder to our project.
  2. The Configuration class. This class allows you to configure how Migrations behaves for your context.
  3. An InitialCreate migration.

What is DbContext?

DbContext is an important class in Entity Framework API. It is a bridge between your domain or entity classes and the database. DbContext is the primary class that is responsible for interacting with the database. Querying: Converts LINQ-to-Entities queries to SQL query and sends them to the database.

How do I know if ef is installed?

To answer the first part of your question: Microsoft published their Entity Framework version history here. If you open the references folder and locate system. data. entity, click the item, then check the runtime version number in the Properties explorer, you will see the sub version as well.

How do I get ef for dotnet?

Get the . NET Core CLI tools

  1. dotnet ef must be installed as a global or local tool. Most developers prefer installing dotnet ef as a global tool using the following command: .NET CLI Copy.
  2. To update the tools, use the dotnet tool update command.
  3. Install the latest Microsoft. EntityFrameworkCore. Design package.

How do I get rid of migration EF core?

Run “dotnet ef migrations remove” again in the command window in the directory that has the project. json file….

  1. Revert migration from database: PM> Update-Database
  2. Remove migration file from project (or it will be reapplied again on next step)
  3. Update model snapshot: PM> Remove-Migration.

How do I get rid of last migration?

Removing and Resetting Migrations

  1. Remove the _MigrationHistory table from the Database.
  2. Remove the individual migration files in your project’s Migrations folder.
  3. Enable-Migrations in Package Manager Console.
  4. Add-migration Initial in PMC.
  5. Comment out the code inside of the Up method in the Initial Migration.

Is DbContext thread safe?

DbContext is not thread-safe You must never access your DbContext -derived instance from multiple threads simultaneously. In a multi-threaded application, you must create and use a separate instance of your DbContext -derived class in each thread.

What is the name of the EF migrations command?

EF Migrations series. Add-EFDefaultConnectionFactory: Adds or updates an Entity Framework default connection factory in the project config file. Initialize-EFConfiguration: Initializes the Entity Framework section in the project config file and sets defaults. The information here is the output of running get-help command-name -detailed…

How to add migration to database in EF Core?

After making changes to your EF Core model, the database schema will be out of sync. To bring it up to date, we need to add another migration by using the Add-Migration command and call this migration AddPhoneNumber. Your migration file will look like this. Apply the migration to the database using the following command.

How does EF take care of the migration?

Once the command runs successfully, it creates an internal sealed Configuration class derived from DbMigrationConfiguration in the Migration folder in your project. The next step is to set the database initializer in the context class. Now EF will automatically take care of the migration when you change the domain classes.

What are the main commands in EF Core?

As you can see above, there are three main EF commands available: database, dbcontext and migrations. The following table lists all EF commands and sub commands. Drops the database. Updates the database to a specified migration. Gets information about a DbContext type.