在RubyMine中无法在Rails 4.1.5中使用mysql2 gem

Question

I am trying to use the mysql 2 gem with Rails, so I added gem 'mysql2' . I am not able to install it using bundle install , and it gives me this error.

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    /Users/Ben/.rvm/rubies/ruby-2.2.0/bin/ruby -r ./siteconf20150307-17143-1jx7cob.rb extconf.rb 
checking for ruby/thread.h... yes
checking for rb_thread_call_without_gvl() in ruby/thread.h... yes
checking for rb_thread_blocking_region()... no
checking for rb_wait_for_single_fd()... yes
checking for rb_hash_dup()... yes
checking for rb_intern3()... yes
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lm... yes
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lz... yes
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lsocket... no
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lnsl... no
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lmygcc... no
checking for mysql_query() in -lmysqlclient... no
*** 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
        --with-opt-include
        --without-opt-include=${opt-dir}/include
        --with-opt-lib
        --without-opt-lib=${opt-dir}/lib
        --with-make-prog
        --without-make-prog
        --srcdir=.
        --curdir
        --ruby=/Users/Ben/.rvm/rubies/ruby-2.2.0/bin/$(RUBY_BASE_NAME)
        --with-mysql-dir
        --without-mysql-dir
        --with-mysql-include
        --without-mysql-include=${mysql-dir}/include
        --with-mysql-lib
        --without-mysql-lib=${mysql-dir}/lib
        --with-mysql-config
        --without-mysql-config
        --with-mysql-dir
        --without-mysql-dir
        --with-mysql-include
        --without-mysql-include=${mysql-dir}/include
        --with-mysql-lib
        --without-mysql-lib=${mysql-dir}/lib
        --with-mysqlclientlib
        --without-mysqlclientlib
        --with-mlib
        --without-mlib
        --with-mysqlclientlib
        --without-mysqlclientlib
        --with-zlib
        --without-zlib
        --with-mysqlclientlib
        --without-mysqlclientlib
        --with-socketlib
        --without-socketlib
        --with-mysqlclientlib
        --without-mysqlclientlib
        --with-nsllib
        --without-nsllib
        --with-mysqlclientlib
        --without-mysqlclientlib
        --with-mygcclib
        --without-mygcclib
        --with-mysqlclientlib
        --without-mysqlclientlib

extconf failed, exit code 1

Gem files will remain installed in /Users/Ben/.rvm/gems/ruby-2.2.0/gems/mysql2-0.3.18 for inspection.
Results logged to /Users/Ben/.rvm/gems/ruby-2.2.0/extensions/x86_64-darwin-14/2.2.0/mysql2-0.3.18/gem_make.out
An error occurred while installing mysql2 (0.3.18), and Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.3.18'` succeeds before bundling.

I have no idea how to get it to work, so any help would be appreciated.

Here is some info on my computer. ruby -v => ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]

gem 'rails', '4.1.5' (rails -v won't work)

bundler -v => Bundler version 1.8.4

OS: Mac Yosemite

Answer 1

For Mac Users:

brew install mysql
gem install mysql2

---

For Ubuntu Users:

sudo apt-get install mysql-server mysql-client libmysqlclient-dev
sudo gem install mysql2

Installing the libmysqlclient-dev gives you the necessary files to compile the mysql2 gem which is what Rails will use to connect to MySQL when you setup your Rails app.

---

Finally, run bundle install

Answer 2

try to install 'libmysqlclient-dev' first

sudo apt-get install libmysqlclient-dev

and after run

bundle install

Answer 3

I figured out my problem, I was running rails server in RubyMine, but for some reason, RM was using an old version of ruby. Changing the project's sdks worked perfectly!

Answer 4

Make sure that you install your gems using bundler.

Run

bundle install

or simply

gem install mysql2

Then include it in your database.yml file

Answer 5

Not an OS specific answer, but may help others:

Newer MySQL2 adapters (v0.4.x) are not compatible with Rails 4.1.5. Specifying an older mysql2 gem (eg v0.3.x) fixes the issue:

gem 'mysql2', '~> 0.3.21'

Source: https://github.com/brianmario/mysql2/issues/675