I have XAMPP and use it to develop my PHP projects. I have also Ruby on Rails on my system, and I want to use MySQL from my XAMPP stack in my Rails projects. I installed the mysql2 gem:
sudo gem install mysql2 -- --with-mysql-config="/opt/lampp/bin/" --with-mysql-include="/opt/lampp/include/" --with-mysql-lib="/opt/lampp/lib/mysql/"
Also, I tried:
bundle update mysql2 -- --with-mysql-config="/opt/lampp/bin/" --with-mysql-include="/opt/lampp/include/" --with-mysql-lib="/opt/lampp/lib/mysql/"
But in both the cases I got the following error when I ran rails s:
/home/sanjib/.rubies/ruby-2.3.0/bin/ruby: symbol lookup error: /home/sanjib/.gem/ruby/2.3.0/gems/mysql2-0.4.5/lib/mysql2/mysql2.so: undefined symbol: mysql_server_init
First install ruby, ruby on rails and XAMPP. Then, type in your terminal...
sudo apt-get update
sudo apt-get install mysql-client libmysqlclient-dev
gem install mysql2
Before create proyect, create the follow databases in phpmyadmin
appname_development
appname_test
appname_production
Lastly, to create your proyect... type this in your terminal:
rails new appname -d mysql
Reference:How To Use MySQL with Your Ruby on Rails Application on Ubuntu 14.04
I just upgraded ubuntu from 11.10 to 12.04 and after that when I run my server inside my rails project I got this error
$ rails s
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/gems/mysql2-0.3.11/lib/mysql2.rb:9:in `require':
libmysqlclient_r.so.16: cannot open shared object file: No such file or directory -
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/gems/mysql2-0.3.11/lib/mysql2/mysql2.so (LoadError)
any help please?
Go to your project and follow the steps,
rvm gemset empty <gemset name>
gem install bundler
bundle install
It will solve your problem.
If that does not work, or if you are not using rvm, please use
gem uninstall mysql2
bundle install
from one of your mysql2-using Rails project's directory.
I followed Babak's instruction that he posted and it worked after a small change.
My system is Ubuntu 12.04 server and it has Ruby1.9.3 installed so I did this
sudo apt-get install mysql-server libmysqlclient-dev
Seems like the libmysqlclient16-dev is now renamed to libmysqlclient-dev in Ubuntu 12.04
Afterwards I ran
gem install mysql2
Well, I would suggest double checking the ruby and the rails version and make sure they are the same ones u created your project with. Maybe you have to change the version using rvm:
rvm use 'Version'
Maybe you can uninstall and reinstall the mysql packages again, also try installing:
sudo apt-get install mysql-client mysql-server libmysqlclient16-dev
or
sudo apt-get install mysql-client mysql-server libmysqlclient-dev
Also try uninstalling and reinstalling your mysql gem. This blog post had a solution for this error as well, although the error was cause at a different time.
For me nothing up there work. Then I found this and try to delete and create again the database.yml file. AND IT WORKS!
I'm trying to install rails and its giving me a headache, I can't seem to get it working. I'm using osx 10.5 and I used macports to get rub,rails and ruby gems installed in opt/local/bin but mysql is getting frustrating, I have it working in a mamp directory, I also tried installing it via the dmg, which works but the profile won't work everytime I try to load it it says "Could not load mysql preference pane" and if I try in terminal type which mysql I get: /usr/local/mysql/bin/mysql but if I try to check the version I get :
mysql -version
dyld: unknown required load command 0x80000022
Trace/BPT trap
I'm trying to launch webrick inside a rails app i've created but when I run "rails server" I get the error:
Could not find gem 'mysql2 (>= 0)' in any of the gem sources listed in your Gemfile.
I have no idea whats going on
Isn't there an easy way to install rails like MAMP?
UPDATE:
ok I got mysql installed, apprently there is a bug with the latest version causing a problem with the preference pane. mysql is installed in
/usr/local/mysql/bin/mysql
2 questions I have about this. Is this the right path should it not be in /usr/local/mysql ?
and the second is how would I link this to my ruby gem? is this right:
sudo gem install mysql -- --with-mysql-dir=/usr/local/mysql
or
sudo gem install mysql -- --with-mysql-dir=/usr/local/mysql/bin/mysql
I suggest you use HomeBrew to install mysql or ruby instead of MacPorts.
Could not find gem 'mysql2 (>= 0)' in any of the gem sources listed in your Gemfile.
This error is caused because rails requires the mysql2 gem to connect to mysql. All you have to do in include
gem mysql2
to the gemfile in the root directory of the rails app and do a bundle install
If you just trying out rails then you might as well use the default sqlite3 database forget about mysql.
The installation path is correct.
Installing the mysql gem is slightly more complicated than necessary since the installation automatically tries generating both 32bit and 64bit versions.
Assuming you have installed the 64 bit binary package, try the following (from the bash command line):
ARCHFLAGS="-arch x86_64" gem install mysql2 -- --with-mysql-config=/usr/local/mysql/bin/mysql_config
However, it is recommended that you do not mess with the OSX ruby installation and use rvm (The Ruby Version Manager) to create a customized ruby environment. You can find a good tutorial for Rails and RVM here.
I am having some problems when trying to install mysql2 gem for Rails. When I try to install it by running bundle install or gem install mysql2 it gives me the following error:
Error installing mysql2: ERROR: Failed to build gem native extension.
How can I fix this and successfully install mysql2?
On Ubuntu/Debian and other distributions using aptitude:
sudo apt-get install libmysql-ruby libmysqlclient-dev
Package libmysql-ruby has been phased out and replaced by ruby-mysql. This is where I found the solution.
If the above command doesn't work because libmysql-ruby cannot be found, the following should be sufficient:
sudo apt-get install libmysqlclient-dev
On Red Hat/CentOS and other distributions using yum:
sudo yum install mysql-devel
On Mac OS X with Homebrew:
brew install mysql
I'm on a mac and use homebrew to install open source programs. I did have to install mac Dev tools in order to install homebrew, but after that it was a simple:
brew install mysql
to install mysql. I haven't had a mysql gem problem since.
here is a solution for the windows users, hope it helps!
Using MySQL with Rails 3 on Windows
Install railsinstaller -> www.railsinstaller.org (I installed it to c:\Rails)
Install MySQL (I used MySQL 5.5) -> dev.mysql.com/downloads/installer/
--- for mySQL installation ---
If you dont already have these two files installed you might need them to get your MySQL going
vcredist_x86.exe -> http://www.microsoft.com/download/en/details.aspx?id=5555
dotNetFx40_Full_x86_x64.exe -> http://www.microsoft.com/download/en/details.aspx?id=17718
Use default install
Developer Machine
-MySQL Server Config-
port: 3306
windows service name: MySQL55
mysql root pass: root (you can change this later)
(username: root)
-MySQL Server Config-
--- for mySQL installation ---
--- Install the mysql2 Gem ---
Important: Do this with Git Bash Command Line(this was installed with railsinstaller) -> start/Git Bash
gem install mysql2 -- '--with-mysql-lib="c:\Program Files\MySQL\MySQL Server 5.5\lib" --with-mysql-include="c:\Program Files\MySQL\MySQL Server 5.5\include"'
Now the gem should have installed correctly
Lastly copy the libmysql.dll file from
C:\Program Files\MySQL\MySQL Server 5.5\lib
to
C:\Rails\Ruby1.9.2\bin
--- Install the mysql2 Gem ---
You will now be able to use your Rails app with MySQL, if you are not sure how to create a Rails 3 app with MySQL read on...
--- Get a Rails 3 app going with MySQL ---
Open command prompt(not Git Bash) -> start/cmd
Navigate to your folder (c:\Sites)
Create new rails app
rails new world
Delete the file c:\Sites\world\public\index.html
Edit the file c:\Sites\world\config\routes.rb
add this line -> root :to => 'cities#index'
Open command prompt (generate views and controllers)
rails generate scaffold city ID:integer Name:string CountryCode:string District:string Population:integer
Edit the file c:\Sites\world\app\models\city.rb to look like this
class City < ActiveRecord::Base
set_table_name "city"
end
Edit the file c:\Sites\world\config\database.yml to look like this
development:
adapter: mysql2
encoding: utf8
database: world
pool: 5
username: root
password: root
socket: /tmp/mysql.sock
add to gemfile
gem 'mysql2'
Open command prompt windows cmd, not Git Bash(run your app!)
Navigate to your app folder (c:\Sites\world)
rails s
Open your browser here -> http://localhost:3000
--- Get a Rails 3 app going with MySQL ---
For MacOS Mojave:
gem install mysql2 -v '0.5.2' -- --with-ldflags=-L/usr/local/opt/openssl/lib --with-cppflags=-I/usr/local/opt/openssl/include
On Ubuntu(18.04)
i was able to solve this issue by running the following:
sudo apt-get install build-essential libmysqlclient-dev
gem install mysql2
reference
Another way for MacOS users
If you used "brew" to install mysql:
gem install mysql2 -v 'x.x.x' -- --with-mysql-config=/usr/local/Cellar/mysql/y.y.y/bin/mysql_config
x.x.x = version of the mysql2 gem you want to install
y.y.y = the version of mysql you have installed ls /usr/local/Cellar/mysql to find it.
I have several computers, 32 and 64 bits processor, they run on Ubuntu Linux, Maverick (10.10) release.
I had the same problem, and for me, the
sudo apt-get install libmysql-ruby libmysqlclient-dev
did the job!!!
Have you tried using
gem install mysql -- --with-mysql-lib=/usr/lib/mysql/lib
to specify the location of thebase directory as well as the path to the MySQL libraries that are necessary to complete the gem installation?
Sources:
MySQL Gem Install ERROR: Failed to build gem native extension
MySQL Forums :: Ruby :: Help needed with installing MySQL binding for Ruby
If you are using yum try:
sudo yum install mysql-devel
This solved my problem once in Windows:
subst X: "C:\Program files\MySQL\MySQL Server 5.5"
gem install mysql2 -v 0.x.x --platform=ruby -- --with-mysql-dir=X: --with-mysql-lib=X:\lib\opt
subst X: /D
On Debian Stretch the package that worked for me was default-libmysqlclient-dev
sudo apt-get update && apt-get install -y default-libmysqlclient-dev
If you are still having trouble….
Try installing
sudo apt-get install ruby1.9.1-dev
In my case this helped:
$ export LDFLAGS="-L/usr/local/opt/openssl/lib"
$ export CPPFLAGS="-I/usr/local/opt/openssl/include"
Then:
gem install mysql2 -v '0.5.2' --source 'https://rubygems.org/' -- --with-cppflags=-I/usr/local/opt/openssl/include --with-ldflags=-L/usr/local/opt/openssl/lib
Result:
Building native extensions with: '--with-cppflags=-I/usr/local/opt/openssl/include --with-ldflags=-L/usr/local/opt/openssl/lib'
This could take a while...
Successfully installed mysql2-0.5.2
Parsing documentation for mysql2-0.5.2
Installing ri documentation for mysql2-0.5.2
Done installing documentation for mysql2 after 0 seconds
1 gem installed
See this post (WARNING: Japanese language inside).
I had this issue on Windows 7. This is apparently an incompatibility issue and the solution is as follows:
Download the libmySQL.dll file from an older InstantRails installer. It is available from the InstantRails GitHub repo.
Next, copy that file into your Ruby/bin folder.
Now, you are good to go ;)
I got this error too. Solved by installing development packages. I'm using arch and it was:
sudo pacman -S base-devel
which installed:
m4, autoconf, automake, bison, fakeroot, flex, libmpc, ppl, cloog-ppl, elfutils, gcc,
libtool, make, patch, pkg-config
but I think it actually needed make and gcc. Error output said (on my machine, among other):
"You have to install development tools first."
So it was an obvious decision and it helped.
You have to Install some dependencies
sudo apt-get install libmysql-ruby libmysqlclient-dev
I can see most of the people have found the solution to this problem, this is mostly coused but not limited to missing packages, this happened to me after I have purged mysql and reinstalled it. I had to run this command in order to fix my problem:
sudo apt-get install libmysqlclient-dev
This command helped me fix my problem
I was running into this error on my mac and found that I needed to upgrade from mysql 32bit to mysql 64 bit to get this error to go away. I was running OSX 10.6 on an intel macbook pro with ruby 1.9.2 and rails3.0.0
I also needed to install xcode in order to get unix utilities like "make" that are required to compile the gem.
once this was done I was able to run gem install mysql and gem install mysql2 without error.
I got the gem built on Mac OS X 10.6.6 by
1) Ensuring the Developer tools package is installed
2) Downloading the current MySQL package (5.5.8 in my case) from Source
3) Installing the cmake tool from cmake.org
4) Following the instructions in section 2.11 of INSTALL-SOURCE from the mysql distribution files
5) sudo gem install mysql2 -- --srcdir=/usr/local/mysql/include
The gem built successfully, but there are two errors in the documentation that rdoc and ri complain about.
But now when I try to require 'mysql2' I get a
LoadError: no such file to load -- mysql2/mysql2
I was hoping the error I would get was that the libmysqlclient.16.dylib couldn't be found because we figured that out in another post (search for install_name_tool).
My $PATH has /usr/local/mysql in it (that's where my source and built files are located), so I'm a little stumped. If anyone has any thoughts, I'll check back after a few hours of sleep.
For windows user:
You set the lib and include path of your mysql, for instance, if youre using xampp you can have like this:
gem install mysql2 -- '--with-mysql-lib="C:\xampp\mysql\lib" --withmysql-include="C:\xampp\mysql\include"'
Solution only works on Mac OS X
If you've installed MySQL with homebrew, what worked for me was uninstalling MySQL, and installing MySQL Community Edition via the MySQL website (https://www.mysql.com/).
After installed, just re-enter the command to gem install mysql2 or if necessary, sudo gem install mysql2, if you are getting permission denied problems.
If still getting error then follow the steps of mysql2 gem installation on Rails 3 on -
http://rorguide.blogspot.com/2011/03/installing-mysql2-gem-on-ruby-192-and.html
where most of the user were able to install mysql2 gem.
After you get the mysql-dev issues corrected, you may need to remove the bad mysql2 install. Look carefully at the messages after $ bundle install. You may need to
rm -rf vendor/cache/
rm -rf ./Zentest
This will clear out the bad mysql2 installation so that a final $ bundle install can create a good one.
download the right version of mysqllib.dll then copy it to ruby bin really works for me. Follow this link plases mysql2 gem compiled for wrong mysql client library
Got the "You have to install development tools first." error when trying to install the mysql2 gem after upgrading to Mac OS X Mountain Lion. Apparently doing this upgrade removes the command line compilers.
To fix:
I uninstalled my very old version of Xcode (ran the uninstall script in /Developer/Library). Then deleted the /Developer directory.
Went to the AppStore and downloaded Xcode.
Launched Xcode and went into the Preferences -> Downloads, and installed the command line tools.
You are getting this problem because you have not install MySql. Before install mysql2 gem. Install MySQL. After that mysql2 gem will install.
I just wanted to add this answer specifically for Mac Users.
My server was running perfectly fine until I updated my xcode. The while starting my rails server the error was shown like this
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
/Users/user/.rvm/rubies/ruby-1.9.3-p448/bin/ruby extconf.rb --with-mysql-
checking for rb_thread_blocking_region()... /Users/user/.rvm/rubies/ruby-1.9.3-
p448/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': The compiler failed to generate an
executable file. (RuntimeError)
And there was suggestion to install mysql2 gem at the end of the error message. So when i tried installing it I got the error as above mentioned in this question. The error I got is as follows
ERROR: Error installing mysql2:
ERROR: Failed to build gem native extension.
So as suggested in this post I tried 'brew install mysql' and that quitted saying that mysql version so and so already installed. But there was warning before it saying
Warning: You have not agreed to the Xcode license.
Builds will fail! Agree to the license by opening Xcode.app or running:
xcodebuild -license
Then I tried this sudo xcodebuild -license and type 'agree' at the end. You have to be root to agree to the license.
After this, I again tried bundle install and then everything is working fine as normal. [ Even due to this xcode updation, I had problem with my tower also.]
libmysql-ruby has been phased out and replaced. New command:
sudo apt-get install ruby-mysql libmysqlclient-dev
Under ubuntu 20.04 LTS it's the only solution that have been working for me:
sudo apt-get install ruby-mysql2
According to https://github.com/brianmario/mysql2/issues/1175 , I fixed it by
gem install mysql2 -- \
--with-mysql-lib=/usr/local/Cellar/mysql/8.0.26/lib \
--with-mysql-dir=/usr/local/Cellar/mysql/8.0.26 \
--with-mysql-config=/usr/local/Cellar/mysql/8.0.26/bin/mysql_config \
--with-mysql-include=/usr/local/Cellar/mysql/8.0.26/include