I'm using FluentMigrator to build and update database. But I need to make migration code manually. I would like to have ability generate this based on entities classes like it makes EntityFramework (code-first). Do we have any solution for this functionality? Or maybe you could advise me another migration system?
What you ask for doesn't exist in Fluent Migrator.
Related
I have read several articles on applying migration in production. I Understand it quite well but i think i want to know detailed about it. I have also read microsoft's documentations but it does not give me what i am looking for.
The Database.Migrate() method is being used in almost everything I read online about it. How does it work? no one explains it.
Assuming in a CMS platform, i want to apply new migrations, a new module is added on runtime and I have to run the migrations automatically because you won't want your users to be involved in the complexity of database operations just as wordpress does.
New modules may contain migration scripts if needed, they will contain a class which inherits from my base DbContext which they can add their module models and everything related to database.
I will then have to merge or load that class or assembly with the core.
How does Database.Migrate work?
Does it produce a migration script?
Does it add a migrations to the migration table as when performed online?
Do I need to pass a migration script to it or can I?
Database.Migrate only applies migrations that have been generated. This is the same as command dotnet ef database update from CLI.
No, it does not. This is the thing that you need to do on your own or automate it with tool / script - documentation
As mentioned before it does not add any NEW migrations, only applies them.
I don' think you can do it. An easier way would be to create some script on deploy that will do the thing you want and revert the database in case of failure. I also advise you to think about migration that will affect data. What if someone will generate migration that will cause the lost of data?
I have added added Entity Framework to my project and selected Code first from database when creating my models. But the problem is, i couln't find how find how to update existing models and add new models to my project when i make changes on database.
It is very straightforward. Switch on migrations, change/add you classes, create a migration and update your database. See here for example. There are plenty of other sources.
When you change your DB you can run the EF generation again but it will overwrite the existing files so you will lose any changes. If you want to maintain code outside the generated files then you can use partial classes. Or alternatively just code them by hand after the initial auto generation, it's quick once you get used to it! :)
What to do when changing database on Entity Framework
Hi,
I am using Microsoft Entity Framework with C#. I used a code first method so that entity framework created some magic code for me so that i didnt need to write it. Now, i need to change my database a bit. Need to add columns in the table and so on. How can i do this? Is there any other option that applying code first method again?? I found this solution a little bit cruel so i ask for help. Haven't found anything useful on google so i try here.
Thx
When updating the database using the code first approach, you want to use Migrations.
http://msdn.microsoft.com/en-us/data/JJ591621.aspx
It automatically scans your changes and creates a Migration object for each set of changes.
There is some steps that you need to take, and I think it is better to refer you to the original documentation of it on MSDN:
You can find your solution here:
http://msdn.microsoft.com/en-us/library/jj591621.aspx
look at the parts that talks about Enabling Migrations and Generating & Running Migrations.
I am using NHibernate and Fluent NHibernate for the first time. I had to physically create the database and write SQL scripts for the first 2 tables. Now, i am wondering if this technology (NHibernate), like Entity Framework (Code First) when you have enabled migrations has a similar too to create and update tables?
This is what i mean by Ef Code First Automatic Migrations
nHibernate does support schema changes using SchemaUpdate
See: Is NHibernate SchemaUpdate safe in production code?
You can also generate a create script to execute against your database using nHibernate SchemaExport.
SchemaUpdate is not recommended for production use because of the security privileges that have to be granted in order for this to work. Personally I think you should look at a code based migrations tool which are designed to handle initial database creates plus full revision control, I use Migrator.NET - Database migration in C#
I want to introduce database migrations into my project and would like to be able to generate my initial migration scripts from the database. I was wondering if there are any code generation tools around to do this? I was thinking of using migrator.net but am happy to use anything so long as I can get a tool to generate code for it.
Wizardby can perform reverse-engineering of existing database schema.
Data Dude (ie: Visual Studio Team System Database Edition) does a very, very good job of this. It allows automatic migration code generation through multiple versions, as well as building full scripts off an existing DB.
Fluent Migrator can do this now too
http://computeristsolutions.com/blog/posts/2011/4/dumping-existing-schema-with-fluentmigrator