我一直试图在Ruby on Rails上使用SQL已经有一段时间了，似乎无法使其正常工作。
我几乎放弃了SQLite，所以现在我的重点是MySQL。我已经完全安装了该程序，它可以独立工作。但是我无法使用Ruby on Rails。
以下是我开始一个新项目并选择MySQL作为数据库时得到的消息。
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
================================================================================
======================
但是，当我继续运行rails服务器时，我收到以下错误：
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>'
我已经尝试了几乎所有我遇到的相关StackExchange问题/答案，包括RubyVersionManager，DevKit，将各种.dll和.a文件移动到C / Ruby / Bin等等但没有太多运气。
任何建议都将不胜感激！我真的想开始使用Ruby on Rails进行编程，并且讨厌我被困在门口......
干杯= D
更新1 :(在Linux环境中尝试）
您好，这个共识似乎是尝试在Linux中运行。
所以我按照这个家伙的说明使用Cygwin＆gt; http://youtu.be/hwo3Eda_ev0
到目前为止一切顺利=）
答案 0 :(得分：2)
解决方案是：
在http://dev.mysql.com/get/Downloads/Connector-C/mysql-connector-c-noinstall-6.0.2-win32.zip/from/pick下载zip并将libmysql.dll文件从那里复制到ruby目录（C：/ Ruby200 / bin）。然后从Rails应用程序访问MySQL应该可以工作。