ruby安装mysql2模块

$ 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