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diff --git a/railties/lib/rails/generators/rails/app/templates/config/databases/jdbcmysql.yml.tt b/railties/lib/rails/generators/rails/app/templates/config/databases/jdbcmysql.yml.tt
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+# MySQL. Versions 5.1.10 and up are supported.
+#
+# Install the MySQL driver:
+#   gem install activerecord-jdbcmysql-adapter
+#
+# Configure Using Gemfile
+# gem 'activerecord-jdbcmysql-adapter'
+#
+# And be sure to use new-style password hashing:
+#   https://dev.mysql.com/doc/refman/5.7/en/password-hashing.html
+#
+default: &default
+  adapter: mysql
+  pool: <%%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
+  username: root
+  password:
+  host: localhost
+
+development:
+  <<: *default
+  database: <%= app_name %>_development
+
+# Warning: The database defined as "test" will be erased and
+# re-generated from your development database when you run "rake".
+# Do not set this db to the same as development or production.
+test:
+  <<: *default
+  database: <%= app_name %>_test
+
+# As with config/secrets.yml, you never want to store sensitive information,
+# like your database password, in your source code. If your source code is
+# ever seen by anyone, they now have access to your database.
+#
+# Instead, provide the password as a unix environment variable when you boot
+# the app. Read http://guides.rubyonrails.org/configuring.html#configuring-a-database
+# for a full rundown on how to provide these environment variables in a
+# production deployment.
+#
+# On Heroku and other platform providers, you may have a full connection URL
+# available as an environment variable. For example:
+#
+#   DATABASE_URL="mysql://myuser:mypass@localhost/somedatabase"
+#
+# You can use this database configuration with:
+#
+#   production:
+#     url: <%%= ENV['DATABASE_URL'] %>
+#
+production:
+  <<: *default
+  database: <%= app_name %>_production
+  username: <%= app_name %>
+  password: <%%= ENV['<%= app_name.upcase %>_DATABASE_PASSWORD'] %>