The Add-Migration command is a crucial part of Entity Framework migrations. We previously had an entity class Client.cs and we already had the database containing a table “Client” for this entity.These are the 6 migrations i will show you and explain how works: We can revert EF Core migrations quite easily. PM> dotnet ef database update -context EmployeeDbContext How to Revert Database to Previous State Then we tell migrations to target “EmployeeContext.cs” as: PM> dotnet ef migrations add Migration1 -context EmployeeContext If an app has more than 1 Database Context file then with the –context keyword we can specify which DbContext file the migration will target.Įxample – There are 2 Database Context files which are – Compan圜ontext.cs & EmployeeContext.cs. The database will have a table called _EFMigrationsHistory which stores the name of all migrations that are applied. Once the update migration command finish executing, we can find a new database is created. We can run either of the 2 update migration command given below: PM> dotnet ef database update If the database is not present then it will create a new database else the database will be updated based the informations given on the migration. The Update Migration command will update the database to the latest migration. You will be interested to read Execute SQL Stored Procedures using FromSqlRaw() & ExecuteSqlRawAsync() methods in Entity Framework Core. Now the migration is created and we can create the database through them. This is used to determine what has changed when creating the next migration.Ĭheck the below given image of these files. ModelSnapshot.cs: A snapshot of the current model._.Designer.cs: The migrations metadata file which contains some db related information.The Up method is responsible for creating DB objects while the Down method removes them. _.cs: It is the main migration file which includes migration operations named Up() and Down() methods.The migration command will create a folder named Migrations on the root of the app. Here Migration1 is the name of the migration and can be any name of our choice. On the Tools > NuGet Package Manager > Package Manager Console execute any one of the 2 commands, that are given below, to create the migration. The Add Migration command will create Migration files that store information from your entity classes and DbContext. Now we are ready to look into some of the most important migration commands. More information can be optained from Installation of Entity Framework Core. To install PMC tools run the following command. Run the following update command to do the updation. If it is already installed then kindly update it to the latest version. PM> dotnet tool install -global dotnet-ef Run the following command to install CLI tools. NET Core command-line interface (CLI) tools or Package Manager Console (PMC) tools to be installed. This window can be opened from Tools ➤ NuGet Package Manager ➤ Package Manager Console menu of Visual Studio. Execute SQL Stored Procedures using FromSqlRaw() & ExecuteSqlRawAsync() methods in Entity Framework Core How to run MigrationsĮF Core Migrations are run from the Package Manager Console window. Execute Raw SQL Queries using FromSqlRaw() method in Entity Framework Core Configure Many-to-Many relationship using Fluent API in Entity Framework Core Configure One-to-One relationship using Fluent API in Entity Framework Core Configure One-to-Many relationship using Fluent API in Entity Framework Core Code-First Approach in Entity Framework Core Database-First approach in Entity Framework Core This tutorial is a part of Entity Framework Core series.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |