database-migration

EF migration utility seems quite nice when using code first. Based on this blog post , I tried setting it in my project where we use model-first. When running Enable-Migrations command, I get the following error: Creating a DbModelBuilder or writing the EDMX from a DbContext created using Database First or Model First is not supported. EDMX can only be obtained from a Code First DbContext created without using an existing DbCompiledModel. Is there any way around it so we can use the EF migration without switching to code-first? I have an incomplete blog entry on how you could do this. Not sure

How can I step into OnModelCreating with a breakpoint and see if my logic is wrong or if the ModelBuilder is doing something I'm not expecting? I've seen lots of posts on how to debug the actual migration, but nothing on how to watch how the model code is being generated. I'm trying to implement some custom attributes on some of my entities, and it's being ignored; I'd like to see what my configuration is doing as it's generating the model code. You should be able to call Debugger.Launch() in your code. The just-in-time debugger should prompt you to attach a debugger when it hits that line. 来源

In my app every user has its own database that created when user registered. Connection and database data (database name, username, password) are saved in a table in default database. try{ DB::transaction(function() { $website = new Website(); $website->user_id = Auth::get()->id; $website->save(); $database_name = 'website_'.$website->id; DB::statement(DB::raw('CREATE DATABASE ' . $database_name)); $websiteDatabase = new WebsiteDatabase(); $websiteDatabase->website_id = $website->id; $websiteDatabase->database_name = $database_name; $websiteDatabase->save(); }); } catch(\Exception $e) { echo

I'm a DB noob so please be kind with me. I'm having some issues pushing my SQLite DB to Heroku via taps gem. Talking with them, they told me one of the solutions could be converting locally my DB from SQLite to PostgreSQL. Is there an easy way to do so? Thanks More info: - DB from Rails app - I'm on Mac OS X - Just installed PostgreSQL via macports sqlite3 development.db .dump | psql dbname username Sequel will help you gem install sequel sequel -C sqlite://db/development.sqlite3 postgres://username:password@localhost/dbname 来源： https://stackoverflow.com/questions/4248072/how-to-migrate-from

I've looked at sqlalchemy-migrate, but it just seems like a lot of work and I haven't been able to find any useful examples. Anyone care to share how they handle this? Check out new project Alembic: http://readthedocs.org/docs/alembic/en/latest/index.html I don't have any personal experience with sqlalchemy-migrate , but here's a tutorial: http://caneypuggies.alwaysreformed.com/wiki/DevelopingWithMigrations If you use the scripts mentioned there, you can create migrations like this: ./new_migration.sh "Describe the new migration here" I do all my migrations with South: http://south.aeracode

I'm having trouble getting Alembic to autogenerate candidate migrations from changes to classes using db.Model (Flask-SQLAlchemy) instead of Base . I've modified env.py to create my Flask app, import all relevant models, initialize the database, and then run migrations: ... uri = 'mysql://user:password@host/dbname?charset=utf8' app = Flask(__name__) app.config['SQLALCHEMY_DATABASE_URI'] = uri app.config['SQLALCHEMY_ECHO'] = True db.init_app(app) with app.test_request_context(): target_metadata = db.Model.metadata config.set_main_option('sqlalchemy.url', uri) if context.is_offline_mode(): run