私はかなり前から Ruby on Rails で SQL を使用しようとしてきましたが、うまくいかないようです。
私は SQLite をほとんどあきらめたので、今は MySQL に集中しています。プログラムを完全にインストールし、それ自体で動作します。ただし、Ruby on Rails で動作させることはできません。
以下は、新しいプロジェクトを開始し、MySQL をデータベースとして選択したときに表示されるメッセージです。
C:\rails_projects>rails new first2_app -d mysql
create
create README.rdoc
create Rakefile
create config.ru
create .gitignore
create Gemfile
create app
create app/assets/images/rails.png
create app/assets/javascripts/application.js
create app/assets/stylesheets/application.css
create app/controllers/application_controller.rb
create app/helpers/application_helper.rb
create app/views/layouts/application.html.erb
create app/mailers/.gitkeep
create app/models/.gitkeep
create config
create config/routes.rb
create config/application.rb
create config/environment.rb
create config/environments
create config/environments/development.rb
create config/environments/production.rb
create config/environments/test.rb
create config/initializers
create config/initializers/backtrace_silencers.rb
create config/initializers/inflections.rb
create config/initializers/mime_types.rb
create config/initializers/secret_token.rb
create config/initializers/session_store.rb
create config/initializers/wrap_parameters.rb
create config/locales
create config/locales/en.yml
create config/boot.rb
create config/database.yml
create db
create db/seeds.rb
create doc
create doc/README_FOR_APP
create lib
create lib/tasks
create lib/tasks/.gitkeep
create lib/assets
create lib/assets/.gitkeep
create log
create log/.gitkeep
create public
create public/404.html
create public/422.html
create public/500.html
create public/favicon.ico
create public/index.html
create public/robots.txt
create script
create script/rails
create test/fixtures
create test/fixtures/.gitkeep
create test/functional
create test/functional/.gitkeep
create test/integration
create test/integration/.gitkeep
create test/unit
create test/unit/.gitkeep
create test/performance/browsing_test.rb
create test/test_helper.rb
create tmp/cache
create tmp/cache/assets
create vendor/assets/javascripts
create vendor/assets/javascripts/.gitkeep
create vendor/assets/stylesheets
create vendor/assets/stylesheets/.gitkeep
create vendor/plugins
create vendor/plugins/.gitkeep
run bundle install
Fetching gem metadata from https://rubygems.org/...........
Fetching gem metadata from https://rubygems.org/..
Resolving dependencies...
Using rake (10.0.4)
Using i18n (0.6.1)
Installing multi_json (1.7.3)
Using activesupport (3.2.13)
Using builder (3.0.4)
Using activemodel (3.2.13)
Using erubis (2.7.0)
Using journey (1.0.4)
Using rack (1.4.5)
Using rack-cache (1.2)
Using rack-test (0.6.2)
Using hike (1.2.2)
Installing tilt (1.4.1)
Using sprockets (2.2.2)
Using actionpack (3.2.13)
Using mime-types (1.23)
Using polyglot (0.3.3)
Using treetop (1.4.12)
Installing mail (2.5.4)
Using actionmailer (3.2.13)
Using arel (3.0.2)
Using tzinfo (0.3.37)
Using activerecord (3.2.13)
Using activeresource (3.2.13)
Using bundler (1.3.5)
Using coffee-script-source (1.6.2)
Using execjs (1.4.0)
Using coffee-script (2.2.0)
Using rack-ssl (1.3.3)
Installing json (1.8.0)
Using rdoc (3.12.2)
Using thor (0.18.1)
Using railties (3.2.13)
Using coffee-rails (3.2.2)
Using jquery-rails (2.2.1)
Installing mysql2 (0.3.11)
Using rails (3.2.13)
Installing sass (3.2.9)
Using sass-rails (3.2.6)
Installing uglifier (2.1.0)
Your bundle is complete!
Use `bundle show [gemname]` to see where a bundled gem is installed.
Post-install message from mysql2:
================================================================================
======================
You've installed the binary version of mysql2.
It was built using MySQL Connector/C version 6.0.2.
It's recommended to use the exact same version to avoid potential issues.
At the time of building this gem, the necessary DLL files where available
in the following download:
http://dev.mysql.com/get/Downloads/Connector-C/mysql-connector-c-noinstall-6.0
.2-win32.zip/from/pick
And put lib\libmysql.dll file in your Ruby bin directory, for example C:\Ruby\
bin
================================================================================
======================
ただし、Rails サーバーの実行に進むと、次のエラーが発生します。
C:\rails_projects\first2_app>rails server
C:/Ruby200/lib/ruby/gems/2.0.0/gems/mysql2-0.3.11-x86-mingw32/lib/mysql2/mysql2.rb:2:
in `require': cannot load such file -- mysql2/2.0/mysql2 (LoadError)
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/mysql2-0.3.11-x86-mingw32/lib/mysql2/mysql2.rb:2:
in `<top (required)>'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/mysql2-0.3.11-x86-mingw32/lib/mysql2.rb:9:
in `require'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/mysql2-0.3.11-x86-mingw32/lib/mysql2.rb:9:
in `<top (required)>'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:
in `require'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:
in `block (2 levels) in require'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:
in `each'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:
in `block in require'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:
in `each'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:
in `require'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler.rb:132:
in `require'
from C:/rails_projects/first2_app/config/application.rb:7:
in `<top (required)>'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:53:
in `require'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:53:
in `block in <top (required)>'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:50:
in `tap'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:50:
in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
RubyVersionManager、DevKit、さまざまな .dll および .a ファイルを C/Ruby/Bin などに移動するなど、関連する StackExchange の質問/回答で遭遇したほとんどすべてを試しましたが、あまり運がありませんでした。
どんなアドバイスでも大歓迎です！私は本当に Ruby on Rails でプログラミングを始めたいと思っています。
乾杯=D
更新 1: (Linux 環境での試み)
こんにちは、コンセンサスは Linux での実行を試みているようです。
そこで、Cygwin の使用に関するこの男の指示に従いました > http://youtu.be/hwo3Eda_ev0
そして、これまでのところすべて順調に進んでいます =)