ruby连接mysql2数据库

require 'rubygems'
require 'active_record'
require 'mysql2'
require 'net/ssh/gateway'
 
gateway = Net::SSH::Gateway.new(
  'remotehost.com',
  'username'
)
 
# opens a new port on the established gateway
port = gateway.open('127.0.0.1', 3306, 3307)
 
# use cmd line to verify connection over ssh tunnel
# mysql -u root -h 127.0.0.1 --port 3307
 
client = Mysql2::Client.new(
  host: "127.0.0.1",
  username: 'root',
  password: '',
  database: 'app_development',
  port: port
)
results = client.query("SELECT * FROM projects")
results.each do |row|
  p row
end
                        
1. [代码][Ruby]代码    
            
1require "mysql"
2dbc = Mysql.real_connect('127.0.0.1','root','123','test')
3res = dbc.query('select * from users')
4while row = res.fetch_row do
5    puts "#{row[0]},#{row[1]}"
6end
7 
8这个是ruby 用mysqlianjie数据库
                    
                                                
2. [代码]mysql2连接    
            
1require 'mysql2'
2client = Mysql2::Client.new(:host => "主机地址", :username => "用户名",:password=>"密码",:database=>"数据库")
3results = client.query("select * from 数据表");
4results.each do |hash|
5  puts hash.map { |k,v| "#{k} = #{v}" }.join(", ")
6end
client.close
 
gateway.shutdown!
 
class Company < ActiveRecord::Base
  establish_connection(
    :adapter  => "mysql2",
    :host     => "127.0.0.1",
    :username => "root",
    :password => "",
    :database => "app_development",
    :port     => 3307             # have to specify the forwarded port for this example due to class scope
  )
end
puts Company.all.size