We're using EF 5RC, code first with migrations. I feel like this should be an easy question to answer (i hope). Is there a good way to figure out what the automatic migration is attempting to do.
I've added a migration through the Add-Migration PS command.
I've invoked Update-Database and all seems fine with that migration.
Now - I'm just running Update-Database like i normally do, but with the following error:
PM> update-database -Verbose
Using StartUp project 'Web'.
Using NuGet project 'DataAccess'.
Specify the '-Verbose' flag to view the SQL statements being applied to the target database.
Target database is: 'UserGroup' (DataSource: (localdb)\v11.0, Provider: System.Data.SqlClient, Origin: Configuration).
No pending code-based migrations.
Applying automatic migration: 201206301526422_AutomaticMigration.
Automatic migration was not applied because it would result in data loss.
Notice, i'm adding the -Verbose option, and I've tried it again with the -Script. But I have no idea what we're migrating to; and what SQL - or what it thinks will result in data loss.
I do not want to simply enable "allow data loss" here, but am trying to understand how to troubleshoot these migrations.
Thank you in advance!
Just run:
PM> Update-Database -Script -Force
This will generate the SQL and display it in a window without running it.
I got this error on Azure after a publish , but there u cant use -Force , so global solution (and no need for -Force on local too )
public Configuration()
{
AutomaticMigrationsEnabled = true;
AutomaticMigrationDataLossAllowed = true; // <-- THIS LINE
}
Related
For some reason I'm getting this error. Below are the specs and then what I did.
Visual Studio 2017 v15.6.2
SQL Server 2008 v10.50.4
I opened the package manager console and added the following packages...
Install-Package Microsoft.EntityFrameworkCore.SqlServer
Install-Package Microsoft.EntityFrameworkCore.Tools
and then I ran
Scaffold-DbContext "Server=ph2srv76;Database=AVDRS;Integrated Security=True;Trusted_Connection=True;" -Provider Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models -force
but during the build I get the following errors...
I hate to post the obvious, but in my case (same error) I was targeting specific tables to model (with -t option) and didn't realize that the table names are case sensitive. Doh!
Those are just warnings (yellow), not errors(red) - you can safely ignore them
In case anyone else gets this I solved it by checking and fixing the following:
Make sure that the user id you are using in the scaffold-dbcontext actually has permissions on the tables you want to scaffold. If not the scaffold cannot find them.
Make sure the tables have primary keys or EF cannot scaffold them. Makes sense if you think about it.
After the above the scaffold worked for me!
In my case, I used -table option. I got the same error when I do this:
-Tables "REPORT, REPORT_TYPE, SAVED_REPORT"
The correct way is this:
-Tables "REPORT", "REPORT_TYPE", "SAVED_REPORT"
I have some data in my database in a table called "Test".
I've made a duplicate of that table called "CopyTest".
If i change:
modelBuilder.Entity<IISLog>()
.ToTable("Test");
to:
modelBuilder.Entity<IISLog>()
.ToTable("CopyTest");
I get an error saying:
context has changed since the database was created. Consider using
Code First Migrations to update the database
How can i stop this from showing? It's just a table name change :)
Solution 1:
Delete First Migration and than try:
Add-Migration <migration-name>
Then open Migration file and change Table Name Manually. After that:
update-database -verbose
If it not works.
Solution 2:
Try to delete Migration History from SQL server Management studio .
Reference URL - Resetting Entity Framework Migrations to a clean Slate
Migrate to the initial DB
with
Update-Database -TargetMigration:"name_of_migration"
then update to your current state:
Update-Database
if necessary add your migration again:
Add-Migration TableNameUpdate
Add a new migration using add-migration Rename_Test_To_CopyTest
Then, in the resulting file, use the RenameTable method:
public partial class Rename_Test_To_CopyTest : DbMigration
{
public override void Up()
{
RenameTable("dbo.Test", "dbo.CopyTest");
}
public override void Down()
{
RenameTable("dbo.CopyTest", "dbo.Test");
}
}
Then use update-database as usual.
In my solution, I have a Data project that contains multiple Entity Framework 6.1.3 migration configuration classes. My goal is to run Entity Framework migration steps - for one of them, against an existing database - from TeamCity (or, to simplify, from a command line).
The migration configuration class I am using is the following:
namespace MyProject.Data
{
public partial class MyCustomMigrationConfiguration :
DbMigrationsConfiguration<MyCustomContext>
{
public MyCustomMigrationConfiguration()
{
AutomaticMigrationsEnabled = false;
AutomaticMigrationDataLossAllowed = true;
MigrationsDirectory = #"Migrations\MyCustomContext\MigrationSteps";
}
}
}
I can successfully run the following command from Package Manager Console in Visual Studio:
Update-Database -Verbose -StartUpProject Web -ConnectionString '-my
connection string here-' -ConfigurationTypeName
MyCustomMigrationConfiguration -ConnectionProviderName
'System.Data.SqlClient'
I want to do the same thing from a command line, so I run this:
migrate.exe MyProject.Data.dll "MyCustomMigrationConfiguration"
/startUpConfigurationFile=MyProject.Web.dll.config
/connectionString="-my connection string here-;"
/connectionProviderName="System.Data.SqlClient" /verbose
However, I get the following error:
ERROR: The migrations configuration type
MyCustomMigrationConfiguration was not be found in the assembly
‘MyProject.Data'.
Any suggestions on how to fix this, please?
You can specify the directory where are all the dependencies (assemblies) needed to run your code. You can do that by using the /startUpDirectory option, as explained here:
Specify working directory
Migrate.exe MyApp.exe /startupConfigurationFile=”MyApp.exe.config” /startupDirectory=”c:\MyApp”
If you assembly has dependencies or reads files relative to the working directory then you will need to set startupDirectory.
Found the solution (I ended up downloading the Entity Framework source code from http://entityframework.codeplex.com/ and debugging the migrate console application).
Apparently, all the dependencies of MyProject.Data.dll need to be copied in the same folder with it and migrate.exe, otherwise the Entity Framework migrate.exe tool will throw the misleading error message above.
Entity Framework could really use better error handling and a clearer error message in this case.
As a reference to Entity Framework devs: the following code in TypeFinder.cs was returning a null type because the dependencies of MyProject.Data.dll were not copied in the folder of migrate.exe:
type = _assembly.GetType(typeName, false);
I have been using Entity Framework (5.0) for a while now in a project (ASP.NET MVC in VS2012 Express). Right now, though, I am no longer able to add migrations.
PM > Add-Migration -projectName MyProject.DAL TestMigration
Unable to update database to match the current model because there are pending changes and automatic migration is disabled. Either write the pending model changes to a code-based migration or enable automatic migration. Set DbMigrationsConfiguration.AutomaticMigrationsEnabled to true to enable automatic migration.
I do not know if this gives any clue but the 'Unable to ..." text is displayed in red.
I have tried to enable automatic migration (which makes no sense as I am trying to write the pending model changes to a code-based migration) and that results in the required migration in the database. However this is not what I want because I then I do not have a migration in the project.
I have tried to remove the database and recreate the database. The database is recreated (up to the previous migration) but when I then try to use the Add-Migration I still get the "Unable to update.." error.
Edit
I tried the -force parameter but with no difference.
The contents of my configuration class (I did not change anything after the previous migration):
public Configuration()
{
AutomaticMigrationsEnabled = false;
}
protected override void Seed(Bekosense.DAL.Context.BekosenseContext context)
{
context.Database.ExecuteSqlCommand(Properties.Resources.TriggerAlertMessageDrop);
context.Database.ExecuteSqlCommand(Properties.Resources.TriggerAlertMessageCreate);
context.Database.ExecuteSqlCommand(Properties.Resources.TriggerAlertMessageSentDrop);
context.Database.ExecuteSqlCommand(Properties.Resources.TriggerAlertMessageSentCreate);
context.Database.ExecuteSqlCommand(Properties.Resources.AddDbUsers);
}
Edit 2
I found out that I am able to do an add-migration when I comment the following line out in my DbContext:
//Database.SetInitializer(new MigrateDatabaseToLatestVersion<MyContext, Configuration>());
when I leave the line above active and comment out everything in the Configuration file, it still won't work.
Why is the Database.SetInitializer line causing this strange behaviour?
You can reset the entity framework to solve your problem [But keep it mind it will bring the Migration to the default state]
Note: To take a backup before performing the following
You need to delete the present state:
Delete the migrations folder in your project
Delete the __MigrationHistory table in your database (may be under system tables)
You will find the __MigrationHistory table in your database [Under App_Data Folder]
Then run the following command in the Package Manager Console:
Enable-Migrations -EnableAutomaticMigrations -Force
Use with or without -EnableAutomaticMigrations
And finally, you can run:
Add-Migration Initial
This may also help you
Never use automigrations, that gave me problems in the past (when migrating the database down, use the correct way to do it from the start!)
This line should be in your global.asax:
Database.SetInitializer(new MigrateDatabaseToLatestVersion<MyContext, Configuration>());
And not in your DbContext!
Other tips if the above won't help:
Perhaps you have multiple layers in your application:
Add-Migration 000 -StartupProjectName "NameOfTheProjectInSolutionExplorer" -ConfigurationTypeName "MyConfiguration" -ConnectionString "theconnectionstring;" -ConnectionProviderName "System.Data.SqlClient" -Verbose
Above is the Add-Migration command i use for a multi-layered application.
Same thing for an update of the database
Update-Database -ConfigurationTypeName "SlaveConfiguration" -StartupProjectName "FacturatieMVCv2.Data" -Verbose -script
In my case I've got the same error because I was forcing ObjectContext.CommandTimeout on class DbContext at constructor method during migration.
Try removing it
((IObjectContextAdapter)this).ObjectContext.CommandTimeout = 5000;
This worked for me:
update-database -targetmigration:"0" -force -verbose
add-migration Initial
update-database
I'm playing around with Entity framework and continuous builds. So far i'm able to run a migration or series of migrations without any problem by using migrate.exe and the appropriate arguments.
However, i've hit trouble when trying to get migrate.exe to kick out a script, rather than perform the migration, in the same way as I could get by running
update-database -TargetMigration TestMigration -script
from within Package Manager Console in Visual Studio.
Is there currently a way to do this?
Thanks.
Since the 10/22/2017 you can do it thanks to this PR:
https://github.com/aspnet/EntityFramework6/commit/02ec6b8c9279f93f80eeed1234e5ce0acfce5f31
Here the Entity Framework 6.2 release notes that implements this functionality (see 'Migrate.exe should support -script option' section):
https://blogs.msdn.microsoft.com/dotnet/2017/10/26/entity-framework-6-2-runtime-released/
Follow those steps:
Copy the file migrate.exe from the '\packages\EntityFramework.6.2.0\tools' to the target 'bin' folder (for example on the production server) after that you deployed the new assembly that contains the new migrations
Open the command line in the folder and launch this command:
migrate.exe yourMigrationAssembly.dll
/startupConfigurationFile=”..\web.config”
/scriptFile="migrationOutput.sql"
It will generate the the file "migrationOutput.sql" that contains the SQL you have to execute on your target environment DB based on the migrations that are not yet applied on it.
It is currently not supported. Please add your vote to the issue: Migrations: -Script for Migrate.exe
I encountered the same problem and indeed the option is available in the package manager console in Visual Studio. So I opened up the powershell script and the entity framework dll and built a small executable so you can generate the scripts from command line.The source code is available as-is and without any warranty here;
EF6
EF5
You can write a simple c# console application or use something like Linqpad to generate the script using the Entity Framework Infrastructure objects. You will just need to load the DLL with your DbMigrationsConfiguration class and instantiate it. Here is the code similar to what is working for me:
using System.Data.Entity.Infrastructure;
using System.Data.Entity.Migrations;
using System.Data.Entity.Migrations.Infrastructure;
const string ScriptFile = "Migration.sql";
const string ConnectionString = #"Server=.\SqlExpress;Database=...;Trusted_Connection=True;";
const bool AutomaticMigrationDataLossAllowed = false;
var targetDb = new DbConnectionInfo(ConnectionString, "System.Data.SqlClient");
var config = new MyDbMigrationsConfiguration
{
AutomaticMigrationDataLossAllowed = AutomaticMigrationDataLossAllowed,
TargetDatabase = targetDb,
};
var migrator = new DbMigrator(config);
var scripter = new MigratorScriptingDecorator(migrator);
var script = scripter.ScriptUpdate(null, null);
File.WriteAllText(ScriptFile, script);
Console.WriteLine("Migration Script Generated: " + ScriptFile);