I have startup project on ASP.NET MVC 5. I want to use Code First with Firebird 2.5.
After enabled migrations and after added first migration, I try update database:
add-migration test
update-database
But I get error:
The name 'FK_AspNetUserRoles_AspNetRoles_RoleId' is longer than
Firebird's 31 characters limit for object names.
How can I change the name FK_AspNetUserRoles_AspNetRoles_RoleId to shorter?
Related
Upgraded our application from .Net Core 3.1 to 5.0.6, and everything was working using an existing database. If I drop the database and run the migrations I get this error:
There is no entity type mapped to the table 'UserClause' used in a data operation. Either add the corresponding entity type to the model or specify the column types in the data operation.
The UserClause table no longer exists it gets renamed in the migration that fails, but if this particular migration completed it would be the Agreement table, but it throws on this migration due to a missing entity type, which definitely doesn't exist either since this was originally run over a year ago.
Anyone know why the migration would be looking for an entity type, and how to resolve the issue? Doesn't seem like this should be checking for entities while it runs the migration.
Looks like in EF Core 5 that some of our migrations where there was a table rename had to have their update or insert statements moved to be after the rename of the table, otherwise you would get this error. Once they were after the table renaming and the table name for the update/insert were changed to the renamed table name everything worked.
In my case, i've to add the schema parameter to the InsertData function, like "dbo"
I am trying to add and update second migration in asp.net core with a different name from Initial Migration, but during update-database the error says There is already an object named 'Values' in the database. How can I can I update the new Entity and not update the Values object.
it seems there is a problem in migration process,
run add-migration command in "Package Manager Console"
Add-Migration Initial -IgnoreChanges
do some changes, and then update database from "Initial" file:
Update-Database -verbose
For more details refer this link
https://stackoverflow.com/a/43687656/495455
Thanks for help, I finally find a solution. I had to remove all migrations and it worked perfectly with different name for the second migration
I'm working on an ASP.NET 5 app that uses Entity Framework 7 with migrations to alter the application's Microsoft Sql Server database.
I'm running into a few issues when I reach the migrations step, and I would like clarification on what the Entity Framework commands migrations add and database update do.
It's my understanding that
> dnx ef migrations add Initial
creates a C# file ending in the name Initial in a folder named Migrations containing code that will create tables based on the application model classes, and
> dnx ef database update
executes the code that will add those changes to the database. However, after the migrations add command, the database has already been created, and the console gives an error when I run the database update command, saying that the tables already exist.
From what I've read on different tutorials, it seems like migrations add shouldn't actually affect the database, and the changes would take place when you run database update, but it doesn't look like that's the case.
Can someone explain what each of these steps are doing and how they fit together? Thanks in advance!
dnx ef migrations add shouldn't create the database. I suspect DbContext.Database.EnsureCreated() is being called somewhere in your application code giving it this effect.
In my application I enable Code First Migrations with some migrations, Also I use SQL Server Compact for integration test.
When I run my tests, Entity Framework create an empty database and tries to run migration on that empty database and thrown The specified table does not exist.
Based on this report I think usage of Migration in Entity Framework 6 has changed.
I test all Database Initializer with Context.Database.Create(); but in all case tabale's never created.
I don't know that this is EntityFramework's bug or not, but when I made rename the namespace of Migration Configuration class from default (Projectname/Migrations) to any none default name, migration works well.
Context.Database.Create() will not execute migrations! It only creates empty db. To Update database from code to latest version you need to use DbMigrator.Update method:
var migrator = new DbMigrator(new MyMigrationsConfiguration());
migrator.Update();
Alternatively you might use MigrateDatabaseToLatestVersion
Database.SetInitializer(new MigrateDatabaseToLatestVersion<BlogContext, Configuration>());
It is described in details here: http://msdn.microsoft.com/en-us/data/jj591621.aspx#initializer
In case someone still struggles to fix the issue.
The code that follows works for me: add-migration MyFirstMigration
Meanwhile add-migration "MyFirstMigration" with the migration name ramped in quote doesn't work.
There may be previous migration files which the ide may be referring to mostly likely due to caching.
Drop backup and drop target database if it exists, and drop the migration folder.
Now add the migration and you will be good to go.
It does happens when adding model and running add-migration command.
Here is the simplest cause of this issue:
Add a newly added model property into IdentityDbContex class.
Here are the steps:
create model
add property into IdentityDbContex class
run add-migration
update-database
I am using EF Code First with EF 5 in VS 2012. I use PM update-database command and I have a simple seed method to fill some tables with sample data.
I would like to delete and recreate my x.mdb. The update history seems to be out of sync. If I comment out all my DBSets in my context, update-database runs with no error but leaves some tables in the DB. As I have no valuable data in the DB it seems to the simplest to reset the all thing.
How can I accomplish this?
If I'm understanding it right...
If you want to start clean:
1) Manually delete your DB - wherever it is (I'm assuming you have your connection sorted), or empty it, but easier/safer is to delete it all together - as there is system __MigrationHistory table - you need that removed too.
2) Remove all migration files - which are under Migrations - and named like numbers etc. - remove them all,
3) Rebuild your project containing migrations (and the rest) - and make sure your project is set up (configuration) to build automatically (that sometimes may cause problems - but not likely for you),
4) Run Add-Migration Initial again - then Update-Database
If you worked the correct way to create your migrations by using the command Add-Migration "Name_Of_Migration" then you can do the following to get a clean start (reset, with loss of data, of course):
Update-database -TargetMigration:0
Normally your DB is empty now since the down methods were executed.
Update-database
This will recreate your DB to your current migration
For EntityFrameworkCore you can use the following:
Update-Database -Migration 0
This will remove all migrations from the database.
Then you can use:
Remove-Migration
To remove your migration.
Finally you can recreate your migration and apply it to the database.
Add-Migration Initialize
Update-Database
Tested on EFCore v2.1.0
Similarly for the dotnet ef CLI tool:
dotnet ef database update 0 [ --context dbcontextname ]
dotnet ef migrations add Initialize
dotnet ef database update
Single Liner to Drop, Create and Seed from Package Manager Console:
update-database -TargetMigration:0 | update-database -force
Kaboom.
How about ..
static void Main(string[] args)
{
Database.SetInitializer(new DropCreateDatabaseIfModelChanges<ExampleContext>());
// C
// o
// d
// i
// n
// g
}
I picked this up from Programming Entity Framework: Code First, Pg 28 First Edition.
dbctx.Database.EnsureDeleted();
dbctx.Database.EnsureCreated();
I am using .net Core 6 and this code is directly stripped out of the Program.cs
using Microsoft.EntityFrameworkCore;
namespace RandomProjectName
{
public class Program
{
public static async Task<int> Main(string[] args)
{
var connectionString = "Server=YourServerName;Database=YourDatabaseName;Integrated Security=True;";
var optionsBuilder = new DbContextOptionsBuilder<YourDataContext>();
optionsBuilder.UseSqlServer(connectionString);
var db = new YourDataContext(optionsBuilder.Options);
db.Database.EnsureDeleted();
db.Database.Migrate();
}
}
}
You should have at minimum initial migration for this to work.
There re many ways to drop a database or update existing database, simply you can switched to previous migrations.
dotnet ef database update previousMigraionName
But some databases have limitations like not allow to modify after create relationships, means you have not allow privileges to drop columns from ef core database providers but most of time in ef core drop database is allowed.so you can drop DB using drop command
and then you use previous migration again.
dotnet ef database drop
PMC command
PM> drop-database
OR you can do manually deleting database and do a migration.
If you created your database following this tutorial: https://msdn.microsoft.com/en-au/data/jj193542.aspx
... then this might work:
Delete all .mdf and .ldf files in your project directory
Go to View / SQL Server Object Explorer and delete the database from the (localdb)\v11.0 subnode. See also https://stackoverflow.com/a/15832184/2279059
Using EF6 with ASP.Net Core 5 I found these commands handy during first initialization of the database:
Remove-Migration -force; Add-Migration InitialMigration; Update-Database;
It removes the last migration (should be the only one), creates it again, then refreshes the database. You can thus type these three commands in one line into the Package Management Console after editing your DbContext and it'll update InitialMigration and database.
A little annoying is that it'll compile your project three times in a row but a least no further manual steps (like deleting the migration files) are necessary.
When you remove an entity you'll need to issue Remove-Database before updating. So the line becomes:
Remove-Migration -force; Add-Migration InitialMigration; Remove-Database; Update-Database;
Problematic here: You need to confirm removing the database + 4 rebuilds.
Take these steps:
Delete those object which should be deleted from the context // Dbset<Item> Items{get;set;}
and in Nuget Console run these commands
add-migration [contextName]
update-database -verbose
It will drop table(s) that not exist in Context, but already created in database
Let me help in updating the answers here since new users will find it useful.
I believe the aim is to delete the database itself and recreate it using EF Code First approach.
1.Open your project in Visual Studio using the ".sln" extention.
2.Select Server Explorer( it is oftentimes on the left)
3.Select SQL Server Object Explorer.
4.The database you want to delete would be listed under any of the localDB. Right-Click it and select delete.
Since this question is gonna be clicked some day by new EF Core users and I find the top answers somewhat unnecessarily destructive, I will show you a way to start "fresh". Beware, this deletes all of your data.
Delete all tables on your MS SQL server. Also delete the __EFMigrations table.
Type dotnet ef database update
EF Core will now recreate the database from zero up until your latest migration.