Migrations specify which other migrations they depend on - including earlier migrations in the same app - in the file, so it’s possible to detect when there’s two new migrations for the same app that aren’t ordered. When this happens, Django will prompt you and give you some options.
Recently I was working on providing a database migrations solution for a quite large.NET learning management system. It was a shame that there was nothing to automate processof updating production databases, and everything must have been done manually. We are usinga custom ORM solution, VS Database project to keep database schemas in source control andfactories to populate databases with static and some test data. Schemas are large - containhundreds of tables, views, and thousands of stored procedures which is why when I was lookingfor a database migrations solution a good maintaining of updating changes in procedures was a must.
In the console write Enable-Migrations -EnableAutomaticMigrations and press enter. In the solution explorer, you get a folder migrations, in which a file Configuration.cs is present. If you open it, you may configure it this way (just an example, do not ever do AutomaticMigrationDataLossAllowed = true in production). Migration to Visual Studio 2017. I’ve developed WhatsApp Viewer with the good old Visual Studio 2008. It’s a bit dated and doesn’t support all of the new C features. Since the new Visual Studio 2017 is free (no costs) for personal usage and open-source projects, I thought it might be worth a shot. 3:55 We can use those commands to enable migrations, add a migration, 4:00 and update our database. 4:05 To enable migrations for our project, let's run the enable migrations command. 4:07 Enable-Migrations, or 4:12 simply enable-migrations. 4:16 All in lowercase letters.
Solution
I managed to find the only one which satisfied these needs - roundhouse.Unfortunately, there were some problems in applying roundhouse to this project but maybe a detailedmigration process is a topic for another post. There were, in short, some changes necessary to be made in rhlibrary and I didn’t like the way of creating database which was “get the initial schema and run all migrations”.I preferred to create a “fresh” database directly from the schema which would support database projectand that’s why I am using both roundhouse (to apply migrations and changes in views/stored procs/functions -and in general keeping database in specific version) and database project (to keep schema in sourcecontrol and creating database from schema).
The process of development requires creating differential scripts besides applying changesin the database project. Diff scripts do not need to store changes in stored procedures/views/functionsbecause roundhouse ensures that. So, a developer can now update the database project directly usingdesigner tool in Visual Studio and save generated update script as a new migration.To apply changes to databases he needs to use roundhouse. But manually creating a script witha specific name every few minutes is boring, and it is therefore first on the list to automate this process.
What we need is to perform a few simple steps.
- Change schema in the database project.
- Compare database project with the database on the developer server. Using schema compare tool we canignore specific object types e.g. stored procedures/views/functions and save comparison as comparison profile in scmp file.
- Generate script with changes and save it to migration folder with specific name eg. with a formatlike YYYYMMddhhmmss_MIGRATION_NAME.sql
Unfortunately, there is no way (or at least I cannot find one), to compare database project with databaseusing a command line tool where I could provide a list of types of objects to ignore.That’s why I create PowerShell script running commands inside Visual Studio. Wurth wow 5.00 12 crack.
To create migration you must have your solution with the database project opened.The running script will add a migration file to your solution (do not mess around in the editor while the script is running).
Examples:
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PM> .AddMigration.ps1 –n MigrationName
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For other database project in solution
PM> .AddMigration.ps1 –n MigrationName –p NotDefaultDatabaseProject
To generate only empty file for migration
PM> .AddMigrations.ps1 –n MigrationName –of
This solution is not ideal mainly because is slow, but it is working, and is better than a manual process.
I have 4 projects :
I tried to enable migration in Toombu.Web but i had this error :
How can I enable migration ?
Answers:
use -ProjectName option in Package Manager Console:
Answers:
I am surprised that no one mentioned the obvious answer to this question: Entity Framework requires a context before enable-migrations will work. The error message the OP posted suggests that no context was found. Sure, it could be because the package manager console doesn’t “see” the context–in which case the accepted answer is a possible solution (another solution is one I suggest, below). But a context must exist in the current project (assembly) before any other solutions will work.
What does it mean to have a context? It means that there must exist a class in your project that inherits from DbContext (in System.Data.Entity). Here is an example:
Be sure you use
before the code above has access to the DbContext class and that you have used NuGet to get Entity Framework 4.1 or later for the current project.
If all along you had a context but the Package Manager Console just doesn’t “see” it: In Visual Studio 2013 you don’t have to use the -ProjectName switch. Instead, go to the Package Manager Console (it’s available in the View | Other Windows list), and look at the two dropdowns that appear at the top of the Package Manager Console dockable window. The first dropdown is for Package Source; the second is for Default Project. If you dropdown the Default Project and select a project in your solution then whatever commands you issue in the Package Manager console will be executed against the selected project.
Answers:
Change the default project and choose the startup project from dropdown:
Answers:
If anyone is still facing this problem. I solved it by using the following command:
Don’t forget to use the full path to your context name.
Answers:
You dbcontext is in
Toombu.DataAccess
So you should enable migrations in Toombu.DataAccess
.Answers:
I had to do a combination of two of the above comments.
Both Setting the Default Project within the Package Manager Console, and also Abhinandan comments of adding the -ContextTypeName variable to my full command. So my command was as follows.
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My Settings::
- ProjectName – RapidDeploy
- BloggingContext (Class Containing DbContext, file is within Models folder of Main Project)
Answers:
What you will need to do is go to the model folder and create a new Class named
MyDbContext
. It should look like this:
Then you will also need to add a reference to
System.Data
then you will also need to invoke it by adding this to the top of your post using System.Data.Entity;
Enable Migrations Visual Studio For Mac Os
Answers:
Change the default project to data access
change the default project dropdown in the package manager console to data access and give enable migrations…
Thats all success
Answers:
Ensure you are using the same version of Entity Framework across all projects using the NuGet Package Manager.
Recent windows updates may have installed a newer version of Entity Framework into your active project.
Background:
Around 16 Mar 2016, I started getting this error when trying to add migrations to a project where I had already enabled migrations and had successfully done migrations for.
Around 16 Mar 2016, I started getting this error when trying to add migrations to a project where I had already enabled migrations and had successfully done migrations for.
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I noticed that around March 10, a new stable version of Entity Framework 6 had been released.
If I specified the -ContextTypeName parameter in the enable-migrations command, I got an error indicating the migrations were already enabled.
Resolution:
1) Tools -> Nuget Package Manager -> Manage Nuget Packages for Solution
2) (Not sure if this step is necessary, but.) I updated my version of the Nuget Package Manager to the latest version. Also, after updating my version of Nuget Package Manager, I had to restart Visual Studio twice before the NuGet Command line would work properly.
3) Tools -> Nuget package Manager -> Manage Nuget Packages for Solution -> Search Installed packages -> Type Entity Framework
a. You may see more than one version of Entity Framework there.
Enable Migrations Visual Studio For Mac Download
b. Click Manage on each version of Entity Framework and ensure that your projects are using the SAME version of Entity Framework.
- Uncheck the version of Entity Framework that you are not using and for the version of Entity Framework you ARE using make sure it is checked across your projects that need it.
Again, as noted in step 2, I had to restart visual studio twice to get the NuGet Package Manager Console to work properly after updating my version of the NuGet Package Manager. I got an error starting the console the first time, and
“exception calling createinstancefrom with 8 arguments could not load file or assembly EntityFramework” when running the enable-migrations command the second time.
“exception calling createinstancefrom with 8 arguments could not load file or assembly EntityFramework” when running the enable-migrations command the second time.
Restarting visual studio seemed to resolve those issues, however.
Answers:
I have been getting this same problem. I have even tried above enable migrations even though I have already done. But it keeps giving same error. Then I had to use the force switch to get overcome this problem. I am sure this will help in someone else’s case as well as its a possible work around.
After enabling migration with force, you should update your database (Make sure default project is set correctly). Otherwise you will get another problem like explicit migrations are pending.
Enable Migrations Visual Studio For Mac Osx
Then just execute your add-migrations or any other commands, it should work.
Visual Studio Enable Migrations
Questions:
Thanks for the suggestions, I solved the problem by combining all the solutions here. At first I created the DbContext Model:
After creating the dbcontext class, I ran the enable-migration command with the project Name: enable-migrations -ProjectName YourProjectName
Answers:
This error getting because of the compiler not getting ‘Context’ class in your application. So, you can add it manually by Add –> Class and inherit it with ‘DbContext’ Class
For Example :
For Example :
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