Entity Framework Core - Knowledge Base (KB)
223 results for: in tag: ef-migrations
Can't update database using EF Migrations after updating to EF 6.0.0-alpha
After updating my Entity Framework to version 6.0.0-alpha1 I cant update database. This is the error I'm getting:...PM> update-database -verbose Using StartUp project 'DataCenter'. Using NuGet project 'DataCenter.Domain'. Specify the '-Verbose' flag to vi...
asked by Mahmoodvcs
What is the correct use of IDatabaseInitializer in EF?
I have a custom DatabaseInitialiser which is below.../// <summary> /// Implements the IDatabaseInitializer to provide a custom database initialisation for the context. /// </summary> /// <typeparam name="TContext">TContext is the DbContext</typeparam> pub...
asked by ashutosh raina
EF6, Code-First, enable-migrations, "Unable to load the specified metadata resource"
I have created a C# class library with 3 entity classes and a DbContext for code-first generation of database. All has gone well with version 1. I have created a separate test library and the class library with the DbContext class has been behaving as e...
asked by Neil W
How to register a custom EF Code First migration operation for scaffolding?
I have ...class SetIdentitySeedOperation: MigrationOperation..., which sets the identity value for the specified table. To wire it up, I use a custom ...SqlServerMigrationSqlGenerator..., so if I manually write ....AddOperation(new SetIdentitySeedOperatio...
asked by chase
Unable to find the requested .Net Framework Data Provider. It may not be installed
This morning I suddenly got this exception when trying to add a custom migration step to our EF Code-first migrations:...The ADO.NET provider with invariant name '.NET Framework Data Provider for SQL Server' is either not registered in the machine or appl...
asked by Jesper Lund Stocholm
Entity framework code first migration to multiple database
Lets say we have the architecture model of web application where we have 1 database per 1 account. Database structure is the same for these accounts and differs only on data with in. How can i configurate a migrations in code first model.
asked by Vitach
Set identity to the previous created column during migration
I have a project with the CodeFirst database (Entity Framework 6) and two migration steps. Database is updated automatically by using this code in Application_Start in Global.asax:...Database.SetInitializer( new MigrateDatabaseToLatestVersion<My...
asked by Starina
How to edit previously applied migration without adding another migration in EF code first
I have an applied migration using "haward" db schema....public partial class CreateCourseCategoryTable : DbMigration { public override void Up() { CreateTable( "haward.CourseCategories", c =>...
asked by Jaime Sangcap
Entity Framework multiple projects with code first migrations
I have a class library project named "Core" which defines CoreContext with properties for common classes:...public class CoreContext : DbContext { public DbSet<User> Users { get; set; } public DbSet<Role> Roles { get; set; } public DbSet<UserC...
asked by Yavor Dimitrov
Error when running Seed method using code first EF 6
I was trying to run the update-database command to insert some initial data in my database and I got and error. Here is my class:...[Table("NotAllowedDomain")] public class NotAllowedDomain : Entity { [Key] public int DomainId { get; set; } p...
asked by ddieppa
How to set the isolation level for Entity Framework CodeFirst Migrations
If you run an entity framework migration (either automatic or explicit) against tables published for SQL Server replication you get the following error: ...You can only specify the READPAST lock in the READ COMMITTED or REPEATABLE READ isolation levels....
asked by Paul-Jan
Entity Framework bug? "Context changed" Error, even when not
I have gotten myself into an odd Groundhog Day scenario with an MVC application of mine.... Unless I apply my workaround (Later in this question) each time I debug the application I'm presented with this error:...The model backing the 'UsersContext' conte...
asked by Mike
error loading database initializer with EF6
I have been trying to follow this tutorial ... ...http://www.asp.net/mvc/tutorials/getting-started-with-ef-using-mvc/creating-an-entity-framework-data-model-for-an-asp-net-mvc-application... but I keep getting the following error ... ...system.invalidoper...
asked by Kevin Donde
Entity Framework 6 Code First migrations - multiple branches for production
In my project we have a branch model that has a separate development branch and has a separate branch for each release. It may look like this:...dev ______ ______ / \ / \ master --+---+----+---+---+----+----+--- (..
asked by pinus.acer
There is already an object named in the database
Update-Database failed from Package Manager Console. I've used Entity Framework 6.x and code-first approach. Error is..."There is already an object named 'AboutUs' in the database."...How can I solve this problem?...internal sealed class Configuration ...
asked by Said Roohullah Allem
How to make Package Manager Console in VS2013 available (not disabled)?
Currently, when I open Package Manager Console in VS2013 it is unavailable (all controls are in disabled state). I want to preform migrations in EF7. (EntityFramework.Commands packages from EF7 is installed in the project.)...I am not sure, why it is no l...
asked by TN.
Entity Framework 6: How to override SQL generator?
I'd like to amend the SQL that's being generated by EF:CF when generating the database schema (DDL), as ...suggested by the Entity Framework team.......How can this be done?...I couldn't find anything appropriate via Google.
asked by AxD
Scaffold migration with context key change
I have restructured my project which led to a change of namespace name of the database context and associated Code First configuration. At that point, I've had one scaffolded migration, "InitialCreate" and thus my database's ...__MigrationHistory... table...
asked by Tomáš Hübelbauer
How to programatically create Sql Azure database of type Basic/Standard edition through Enity Framework code first
I use EF 6. My existing code is : ...public void CreateOrUpdateCompanyDb(string companyDbName) { try { string connectionString = _connectionStringProvider.GetConnectionString(companyDbName); DbMigrationsConfiguratio...
asked by Ognyan Dimitrov
Entity Framework 6.1 Code First migration error: EntityType 'IdentityUserRole' has no key defined
I created a new MVC 5 project and I tried to enable migrations for the Code First entities I've been creating, when I got the following PS exceptions in the Package Manager Console:...One or more validation errors were detected during model generation: P...
asked by joe_coolish
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