ruby連接mysql2數據庫

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. [代碼][Ruby]代碼    

1	require "mysql"

2	dbc = Mysql.real_connect('127.0.0.1','root','123','test')

3	res = dbc.query('select * from users')

4	while row = res.fetch_row do

5	puts "#{row[0]},#{row[1]}"

6

end

7

8	這個是ruby 用mysqlianjie數據庫

2. [代碼]mysql2連接    

1	require 'mysql2'

2	client = Mysql2::Client.new(:host => "主機地址", :username => "用戶名",:password=>"密碼",:database=>"數據庫")

3	results = client.query("select * from 數據表");

4	results.each do |hash|

5	puts hash.map { |k,v| "#{k} = #{v}" }.join(", ")

6

end

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