rake db 常用指令備註

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$ rake db:create          # Create the database from DATABASE_URL or config/database.yml for the current Rails.env (use db:create:all to create all dbs in the config)
$ rake db:drop # Drops the database using DATABASE_URL or the current Rails.env (use db:drop:all to drop all databases)
$ rake db:fixtures:load # Load fixtures into the current environment's database
$ rake db:migrate # Migrate the database (options: VERSION=x, VERBOSE=false)
$ rake db:migrate:status # Display status of migrations
$ rake db:rollback # Rolls the schema back to the previous version (specify steps w/ STEP=n)
$ rake db:schema:dump # Create a db/schema.rb file that can be portably used against any DB supported by AR
$ rake db:schema:load # Load a schema.rb file into the database
$ rake db:seed # Load the seed data from db/seeds.rb
$ rake db:setup # Create the database, load the schema, and initialize with the seed data (use db:reset to also drop the db first)
$ rake db:structure:dump # Dump the database structure to db/structure.sql
$ rake db:version # Retrieves the current schema version number
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