SQL and Rails. Cannot open shared object file [duplicate] - sql

Question

There's not much more to my question than that. gem install mysql doesn't work and I haven't found anything by Googling.
When I try gem install mysql2, this is what I get. I don't know what to do now.
jason#buster:~/projects/mcif-rails$ gem install mysql2
Building native extensions. This could take a while...
ERROR: Error installing mysql2:
ERROR: Failed to build gem native extension.
/home/jason/.rvm/rubies/ruby-1.9.2-p136/bin/ruby extconf.rb
checking for rb_thread_blocking_region()... 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... yes
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
--without-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=/home/jason/.rvm/rubies/ruby-1.9.2-p136/bin/ruby
--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
Gem files will remain installed in /home/jason/.rvm/gems/ruby-1.9.2-p136/gems/mysql2-0.2.6 for inspection.
Results logged to /home/jason/.rvm/gems/ruby-1.9.2-p136/gems/mysql2-0.2.6/ext/mysql2/gem_make.out

Answer 1

It looks like you still need to install MySQL's development libraries. These are required for the gem to build successfully on your system.
[Edit] Seems the RoR Wiki is no longer available. But, Ubuntu has offered their own walkthrough which suggests:
sudo apt-get install mysql-server mysql-client
sudo apt-get install libmysql-ruby libmysqlclient-dev
sudo gem install mysql
See http://wiki.rubyonrails.org/database-support/mysql#installation for more detail.
Example: Ubuntu
sudo apt-get install mysql-server mysql-server-5.0 libmysqlclient15off \
libmysqlclient15-dev mysql-client-5.0 mysql-common
sudo apt-get install libmysql++-dev
sudo gem install mysql

Answer 2

I'll just leave this here:
I ran into a similar problem, then realized I couldn't install the mysql2 gem without having MySQL installed on my development machine (even though I'm only using the mysql2 gem to connect to a remote MySQL server).
::forehead slap::
brew install mysql
then, in my Gemfile:
gem 'mysql2', '~> 0.3.11'
followed by a quick
bundle install
Success!

Answer 3

If you are running Rails 3 you should use the mysql2 gem. You can install it with:
gem install mysql2
You will need to first install MySQL and any development headers. This will vary across different operating systems. On Ubuntu, you can run:
aptitude install mysql-server
aptitude install mysql-client
aptitude install mysql-common
aptitude install libmysql-ruby
aptitude install libmysqlclient-dev
If you are creating a new project, use:
rails new sample --database=mysql
cd sample
bundle install
For more details, check out the project repository.

Answer 4

I assume you are working with Rails.
In your Gemfile:
gem 'mysql2'
Then in your terminal:
bundle

Answer 5

In 2013, Using Ubuntu 12.04, this worked for me:
sudo apt-get install mysql-client libmysqlclient-dev
bundle install