？嗨！
当我尝试使用Mysql
在rails上创建一个新项目时rails new appnameywea --database mysql
失败
create
create README.rdoc
create Rakefile
create config.ru
create .gitignore
create Gemfile
create app
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/assets/images/.keep
create app/mailers/.keep
create app/models/.keep
create app/controllers/concerns/.keep
create app/models/concerns/.keep
create bin
create bin/bundle
create bin/rails
create bin/rake
create bin/setup
create config
create config/routes.rb
create config/application.rb
create config/environment.rb
create config/secrets.yml
create config/environments
create config/environments/development.rb
create config/environments/production.rb
create config/environments/test.rb
create config/initializers
create config/initializers/assets.rb
create config/initializers/backtrace_silencers.rb
create config/initializers/cookies_serializer.rb
create config/initializers/filter_parameter_logging.rb
create config/initializers/inflections.rb
create config/initializers/mime_types.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 lib
create lib/tasks
create lib/tasks/.keep
create lib/assets
create lib/assets/.keep
create log
create log/.keep
create public
create public/404.html
create public/422.html
create public/500.html
create public/favicon.ico
create public/robots.txt
create test/fixtures
create test/fixtures/.keep
create test/controllers
create test/controllers/.keep
create test/mailers
create test/mailers/.keep
create test/models
create test/models/.keep
create test/helpers
create test/helpers/.keep
create test/integration
create test/integration/.keep
create test/test_helper.rb
create tmp/cache
create tmp/cache/assets
create vendor/assets/javascripts
create vendor/assets/javascripts/.keep
create vendor/assets/stylesheets
create vendor/assets/stylesheets/.keep
run bundle install
Fetching gem metadata from https://rubygems.org/
Fetching version metadata from https://rubygems.org/
Fetching dependency metadata from https://rubygems.org/
Resolving dependencies............................................
Using rake 11.2.2
Using i18n 0.7.0
Using json 1.8.3
Using minitest 5.9.0
Using thread_safe 0.3.5
Using builder 3.2.2
Using erubis 2.7.0
Using nokogiri 1.6.8
Using rack 1.6.4
Using mime-types-data 3.2016.0521
Using arel 6.0.3
Using debug_inspector 0.0.2
Using bundler 1.12.5
Using byebug 9.0.5
Using coffee-script-source 1.10.0
Using execjs 2.7.0
Using thor 0.19.1
Using concurrent-ruby 1.0.2
Using multi_json 1.12.1
Installing mysql2 0.4.4 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
current directory: /home/yukan/.gem/ruby/gems/mysql2-0.4.4/ext/mysql2
/usr/bin/ruby -r ./siteconf20160828-12619-1uphiih.rb extconf.rb
checking for ruby/thread.h... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers. Check the mkmf.log file for more details. You may
need configuration options.
Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib64
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/usr/bin/$(RUBY_BASE_NAME)
/usr/share/ruby/mkmf.rb:456:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
from /usr/share/ruby/mkmf.rb:587:in `try_cpp'
from /usr/share/ruby/mkmf.rb:1091:in `block in have_header'
from /usr/share/ruby/mkmf.rb:942:in `block in checking_for'
from /usr/share/ruby/mkmf.rb:350:in `block (2 levels) in postpone'
from /usr/share/ruby/mkmf.rb:320:in `open'
from /usr/share/ruby/mkmf.rb:350:in `block in postpone'
from /usr/share/ruby/mkmf.rb:320:in `open'
from /usr/share/ruby/mkmf.rb:346:in `postpone'
from /usr/share/ruby/mkmf.rb:941:in `checking_for'
from /usr/share/ruby/mkmf.rb:1090:in `have_header'
from extconf.rb:16:in `<main>'
To see why this extension failed to compile, please check the mkmf.log which can be found here:
/home/yukan/.gem/ruby/extensions/x86_64-linux/2.3.0/mysql2-0.4.4/mkmf.log
extconf failed, exit code 1
Gem files will remain installed in /home/yukan/.gem/ruby/gems/mysql2-0.4.4 for inspection.
Results logged to /home/yukan/.gem/ruby/extensions/x86_64-linux/2.3.0/mysql2-0.4.4/gem_make.out
Using sass 3.4.22
Using tilt 2.0.5
Using spring 1.7.2
Using turbolinks-source 5.0.0
Using rdoc 4.2.2
Using tzinfo 1.2.2
Using loofah 2.0.3
Using rack-test 0.6.3
Using mime-types 3.1
Using binding_of_caller 0.7.2
Using coffee-script 2.4.1
Using uglifier 3.0.2
Using sprockets 3.7.0
An error occurred while installing mysql2 (0.4.4), and Bundler cannot
continue.
Make sure that `gem install mysql2 -v '0.4.4'` succeeds before bundling.
run bundle exec spring binstub --all
Bundler::GemNotFound: Could not find gem 'mysql2 (< 0.5, >= 0.3.13)' in any of the gem sources listed in your Gemfile or available on this machine.
/home/yukan/.gem/ruby/gems/bundler-1.12.5/lib/bundler/resolver.rb:356:in `block in verify_gemfile_dependencies_are_found!'
/home/yukan/.gem/ruby/gems/bundler-1.12.5/lib/bundler/resolver.rb:331:in `each'
/home/yukan/.gem/ruby/gems/bundler-1.12.5/lib/bundler/resolver.rb:331:in `verify_gemfile_dependencies_are_found!'
/home/yukan/.gem/ruby/gems/bundler-1.12.5/lib/bundler/resolver.rb:200:in `start'
/home/yukan/.gem/ruby/gems/bundler-1.12.5/lib/bundler/resolver.rb:184:in `resolve'
/home/yukan/.gem/ruby/gems/bundler-1.12.5/lib/bundler/definition.rb:200:in `resolve'
/home/yukan/.gem/ruby/gems/bundler-1.12.5/lib/bundler/definition.rb:140:in `specs'
/home/yukan/.gem/ruby/gems/bundler-1.12.5/lib/bundler/definition.rb:185:in `specs_for'
/home/yukan/.gem/ruby/gems/bundler-1.12.5/lib/bundler/definition.rb:174:in `requested_specs'
/home/yukan/.gem/ruby/gems/bundler-1.12.5/lib/bundler/environment.rb:19:in `requested_specs'
/home/yukan/.gem/ruby/gems/bundler-1.12.5/lib/bundler/runtime.rb:14:in `setup'
/home/yukan/.gem/ruby/gems/bundler-1.12.5/lib/bundler.rb:95:in `setup'
/home/yukan/.gem/ruby/gems/bundler-1.12.5/lib/bundler/setup.rb:19:in `<top (required)>'
/usr/share/rubygems/rubygems/core_ext/kernel_require.rb:55:in `require'
/usr/share/rubygems/rubygems/core_ext/kernel_require.rb:55:in `require'
bundler: failed to load command: spring (/bin/spring)
当我跑这个......
gem install mysql2 -v '0.4.4'
Building native extensions. This could take a while...
ERROR: Error installing mysql2:
ERROR: Failed to build gem native extension.
current directory: /home/yukan/.gem/ruby/gems/mysql2-0.4.4/ext/mysql2
/usr/bin/ruby -r ./siteconf20160828-13121-162bkye.rb extconf.rb
checking for ruby/thread.h... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers. Check the mkmf.log file for more details. You may
need configuration options.
Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib64
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/usr/bin/$(RUBY_BASE_NAME)
/usr/share/ruby/mkmf.rb:456:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
from /usr/share/ruby/mkmf.rb:587:in `try_cpp'
from /usr/share/ruby/mkmf.rb:1091:in `block in have_header'
from /usr/share/ruby/mkmf.rb:942:in `block in checking_for'
from /usr/share/ruby/mkmf.rb:350:in `block (2 levels) in postpone'
from /usr/share/ruby/mkmf.rb:320:in `open'
from /usr/share/ruby/mkmf.rb:350:in `block in postpone'
from /usr/share/ruby/mkmf.rb:320:in `open'
from /usr/share/ruby/mkmf.rb:346:in `postpone'
from /usr/share/ruby/mkmf.rb:941:in `checking_for'
from /usr/share/ruby/mkmf.rb:1090:in `have_header'
from extconf.rb:16:in `<main>'
To see why this extension failed to compile, please check the mkmf.log which can be found here:
/home/yukan/.gem/ruby/extensions/x86_64-linux/2.3.0/mysql2-0.4.4/mkmf.log
extconf failed, exit code 1
Gem files will remain installed in /home/yukan/.gem/ruby/gems/mysql2-0.4.4 for inspection.
Results logged to /home/yukan/.gem/ruby/extensions/x86_64-linux/2.3.0/mysql2-0.4.4/gem_make.out
简而言之，它无法加载'spring'命令，并且...我知道它是什么但我不知道如何解决它。
我是新手，我不知道我在做什么，所以，对不起，如果这个问题显而易见，我很抱歉！
PS：是的，我安装'gem mysql2'
PS2：“捆绑安装”也因同样的问题而失败：弹簧
PS3：我试图创建一个没有--database mysql和爆炸的项目，因为当我安装它们时没有'gem mysql2'; - ;
答案 0 :(得分：0)
我猜你错过了图书馆libmysqlclient-dev。
尝试通过命令安装：
sudo apt-get install libmysqlclient-dev