Rails 3: Change charset and collation of an existing mysql database

问题

Is it possible to change the charset and collation of an existing Mysql database using Rails migrations or other options ?!

What's the best way to initially configure database charset & collation ?!

回答1:

For latest version of Rails you can use this gist:

Change charset and collation of an existing mysql

Modified from here:

回答2:

Native query could be executed in rails migration:

def self.up
  execute "ALTER DATABASE `#{ActiveRecord::Base.connection.current_database}` CHARACTER SET charset_here COLLATE collation_here;"
end

And for initial configuration you can predefine charset and collation in your database.yml file, like this:

production:
  adapter: mysql2
  encoding: utf8mb4
  collation: utf8mb4_unicode_ci

回答3:

I used Migrating your Rails application to Unicode and changed:

when 'MySQL'

to

when 'Mysql2'

来源：https://stackoverflow.com/questions/8200699/rails-3-change-charset-and-collation-of-an-existing-mysql-database