2019独角兽企业重金招聘Python工程师标准>>> 
$ sudo gem install mysql2 --'--with-mysql-config=/opt/mysql/bin/mysql_config'
测试
$ cat testmysql2.rb
require 'mysql2'
client = Mysql2::Client.new(:host => "127.0.0.1", :username => "用户名",:password=>"密码",:database=>"数据库名");
results = client.query("select * from 表");
results.each do |hash|
puts hash.map { |k,v| "#{k} = #{v}" }.join(", ")
end安装pg模块
sudo gem install pg --'--with-pg-config=/opt/PostgreSQL/9.4/bin/pg_config'