Ruby中的Mysql适配器ActiveRecord抛出：“数据包乱序”

Question

Ruby版本：1.9.1 Mysql版本：5.0

编写的代码为：

    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

上面的代码打印到3，并在Source.find（1）处中断并出现错误：

1 2 3 C：/Ruby/lib/ruby/1.9.1/mysql.rb：1019： 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 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读取为C：/Ruby/lib/ruby/1.9.1/mysql.rb：110：在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从C：/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_record/connection_adapters/mysql_adapter.rb：36：in中的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' 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来自C：/ Ruby / lib的new_connection /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从C：/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_rerd /connection_adapters/abstract/connection_pool.rb:186：in loop'from 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从C：/Ruby/lib/ruby/1.9.1/monitor.rb中结帐''：201： 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中的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 restore_connection'from C：/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_reco rd / connection_adapters / abstract / connection_specificati 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从C：/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_reco rd / base.rb：679：在columns' from C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_record/persistence.rb:284:in来自C：/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3的attributes_from_column_definition中/lib/active_record/locking/optimistic.rb:62 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 '从C：/WorkspaceGunjan/TrafficTracker/TrafficTracker/TestProject/RubyPrograms/RubyPrograms/AccessTrafficTracker.rb：22：在初始化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>

经过更多分析后，我发现\\ Ruby \\ lib \\ ruby​​ \\ 1.9.1中的mysql.rb存在问题。创建方法的问题是：

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

最后，在尽我所有的MySql和Postgresql努力之后，我能够与MySql成功建立连接。
工作集涉及：
Ruby版本：1.87
MySql版本：5.5
要使用ActiveRecord，需要安装适配器。 在命令提示符下，输入：
gem安装mysql2。

用于在ActiveRecord层下建立MySql数据库与Ruby成功连接的代码：

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

注意：使用的适配器是mysql2而不是mysql