Rails - Jul 2014 - how can i get data from localhost:3000 in ruby on rails to heroku

Hi i'm new developer ROR .I have some question to ask?
In my local machine i had input some data into database using SQLite3 .when 
i deployed it to heroku why i can't get data that i input? i'm do like
this

-in Gemfile
group :development do
  gem 'sqlite3'
end
group :production do
  gem 'pg'
  gem 'rails_12factor'
end
-bundle install
-heroku login
-git init 
-git add .
-git commit -m "test"
-git create
-git push heroku master
-heroku run rake db:migrate

how can i get some data when i deployed it to heroku? please help me.

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