tracks/lib/tasks/database.rake

require 'rake'

namespace :db do
  desc "Dump the current SQLite3 or MySQL database to a sql file" 
  task :dump_sql do
    load 'config/environment.rb'
    abcs = ActiveRecord::Base.configurations
    case abcs[RAILS_ENV]["adapter"]
    when 'mysql'
      ActiveRecord::Base.establish_connection(abcs[RAILS_ENV])
      File.open("db/#{RAILS_ENV}_data.sql", "w+") do |f|
        if abcs[RAILS_ENV]["password"].blank?
          f << `mysqldump -h #{abcs[RAILS_ENV]["host"]} -u #{abcs[RAILS_ENV]["username"]} #{abcs[RAILS_ENV]["database"]}`
        else
          f << `mysqldump -h #{abcs[RAILS_ENV]["host"]} -u #{abcs[RAILS_ENV]["username"]} -p#{abcs[RAILS_ENV]["password"]} #{abcs[RAILS_ENV]["database"]}`
        end
      end
    when 'sqlite3'
      ActiveRecord::Base.establish_connection(abcs[RAILS_ENV])
      File.open("db/#{RAILS_ENV}_data.sql", "w+") do |f|
        f << `sqlite3  #{abcs[RAILS_ENV]["database"]} .dump`
      end
    else
      raise "Task not supported by '#{abcs[RAILS_ENV]['adapter']}'" 
    end
  end
end