Ruby抛出中的Mysql适配器ActiveRecord：“数据包无序”

Question

Ruby版本: 1.9.1 Mysql版本: 5.0

所写的代码是：

​

    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)处插入错误：

1 2 3 C:/Ruby/lib/ruby/1.9.1/mysql.rb:1019:in read': Packets out of order: 0<> (RuntimeError)

从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:inconnect‘from C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3 initialize' from C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_record/connection_adapters/mysql_adapter.rb:36:innew’开始from C:/Ruby/lib/ruby/1.9.1/mysql.rb:444:inC:/ .0.3/lib/active_record/connection_adapters/mysql_adapter.rb:36:in /lib/ruby/gems/1.9.1/gems中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块的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:innew_connection (2级)/activerecord-3.0.3/lib/active_reco签出中的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块从C:/ruby/lib/ruby/1.9.1/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签出: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签出‘从C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_reco rd/connection_adapters/abstract/connection_pool来自C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_reco rd/connection_adapters/abstract/connection_specification.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:inconnection的.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:inretrieve_connection来自C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_reco rd/base.rb:679:incolumns' from C:/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_record/persistence.rb:284:inattributes_from_column_definition‘从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初始化“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>

在详细分析之后，我发现\Ruby\lib\ruby\1.9.1中的mysql.rb存在问题，创建问题的方法是：

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，在使用MySql和Postgresql进行了所有的努力之后，我能够成功地与MySql连接。

成套工作包括：

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，写：

gem安装mysql2。

在MySql层下构建成功连接ActiveRecord数据库的代码：

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。