Ruby中的Mysql适配器ActiveRecord抛出：“数据包乱序”

Question

Ruby version: 1.9.1 Mysql version: 5.0

code written was:

    require "rubygems"
    require "active_record"
    puts "1"
    class Source < ActiveRecord::Base
        puts "2"
        establish_connection(
                :adapter => "mysql",
                :host => "localhost",
                :username => "root",
                :password => "root@123",
                :database => "TrafficTracker"
            )
    end
    puts "3"
    traffic_source = Source.find(1)
    puts "4"
    puts traffic_source.source_name

Above code prints till 3 and breaks at Source.find(1) with error:

1 2 3 C:/Ruby/lib/ruby/1.9.1/mysql.rb:1019:in read': Packets out of order: 0<> (RuntimeError)
from C:/Ruby/lib/ruby/1.9.1/mysql.rb:444:in read': Packets out of order: 0<> (RuntimeError)
from C:/Ruby/lib/ruby/1.9.1/mysql.rb:444:in read': Packets out of order: 0<> (RuntimeError)
from C:/Ruby/lib/ruby/1.9.1/mysql.rb:444:in read' from C:/Ruby/lib/ruby/1.9.1/mysql.rb:110:in real_connect' from C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_record/connection_adapters/mysql_adapter.rb:600:in connect' from C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_record/connection_adapters/mysql_adapter.rb:164:in initialize' from C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_record/connection_adapters/mysql_adapter.rb:36:in new' from C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_record/connection_adapters/mysql_adapter.rb:36:in mysql_connection' from C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:228:in new_connection' from C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:236:in checkout_new_connection' from C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:190:in checkout_new_connection' from C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:190:in block (2 levels) in c heckout' from C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_reco rd/connection_adapters/abstract/connection_pool.rb:186:in loop' from C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_reco rd/connection_adapters/abstract/connection_pool.rb:186:in block in checkout' from C:/Ruby/lib/ruby/1.9.1/monitor.rb:201:in mon_synchronize' from C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_reco rd/connection_adapters/abstract/connection_pool.rb:185:in checkout' from C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_reco rd/connection_adapters/abstract/connection_pool.rb:93:in connection' from C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_reco rd/connection_adapters/abstract/connection_pool.rb:316:in retrieve_connection' from C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_reco rd/connection_adapters/abstract/connection_specificati on.rb:97:in retrieve_conn ection' from C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_reco rd/connection_adapters/abstract/connection_specification.rb:89:in connection' from C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_reco rd/base.rb:679:in columns' from C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_record/persistence.rb:284:in attributes_from_column_definition' from C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_record/locking/optimistic.rb:62:in attributes_from_column_definition' from C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_record/base.rb:1394:in initialize' from C:/WorkspaceGunjan/TrafficTracker/TrafficTracker/TestProject/RubyPrograms/RubyPrograms/AccessTrafficTracker.rb:22:in new' from C:/WorkspaceGunjan/TrafficTracker/TrafficTracker/TestProject/RubyPrograms/RubyPrograms/AccessTrafficTracker.rb:22:in ' C:\\WorkspaceGunjan\\TrafficTracker\\TrafficTracker\\TestProject\\RubyPrograms\\RubyPrograms> C:\\ WorkspaceGunjan\\TrafficTracker\\TrafficTracker\\TestProject\\RubyPrograms\\RubyPrograms> C:\\WorkspaceGunjan\\TrafficTracker\\TrafficTracker\\TestProject\\RubyPrograms\\RubyPrograms>

after analyzing more, i found problem with mysql.rb in \\Ruby\\lib\\ruby\\1.9.1 Method creating problem is:

def read()
      buf = []
      len = nil
      @sock.sync = false
      while len == nil or len == MAX_PACKET_LENGTH do
    a = @sock.read(4)
    len = a[0]+a[1]*256+a[2]*256*256
    pkt_nr = a[3]
    if @pkt_nr != pkt_nr then
      raise "Packets out of order: #{@pkt_nr}<>#{pkt_nr}"   #Exception raised at line number 1019
    end
    @pkt_nr = @pkt_nr + 1 & 0xff
    buf << @sock.read(len)
      end
      @sock.sync = true
      buf.join
    end

Answer 1

Finally, after putting all my efforts with MySql and Postgresql, I am able to make successful connection with MySql.
Working set involves:
Ruby Version: 1.87
MySql Version: 5.5
To work with ActiveRecord, one need to have the adapter installed. On command prompt, write:
gem install mysql2.

Code to build successful connection of MySql database with Ruby under the layer of ActiveRecord:

require "rubygems"
require "active_record"
class Source < ActiveRecord::Base
    set_table_name "sources"
    ActiveRecord::Base.establish_connection(
        :adapter => "mysql2",
        :host => "localhost",
        :username => "test",
        :password => "test",
        :port => 3306,
        :database => "TestDB",
        :socket => "mysql"
    )
end
source = Source.find(:first, :conditions => [ "source_id = ?", 2 ])
puts source.source_name

Note: Adapter used is mysql2 and not mysql