Question

Ruby版本：1.9.1 Mysql版本：5.0

编写的代码是：


    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）中断，错误：

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' 来自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' 来自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' 来自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' 来自C：/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:236：在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（2级）中C heckout” 来自C：/Ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_reco rd / connection_adapters / abstract / connection_pool.rb：186：在结账时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块中' 来自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' 来自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' 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:in connection' 来自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 attributes_from_column_definition'中来自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' 来自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＆GT; C：\ WorkspaceGunjan \ TrafficTracker \ TrafficTracker \ TestProject \ RubyPrograms \ RubyPrograms＆GT; C：\ WorkspaceGunjan \ TrafficTracker \ TrafficTracker \ TestProject \ RubyPrograms \ RubyPrograms＆GT;

在分析了更多之后，我在\ Ruby \ lib \ ruby \ 1.9.1中发现了mysql.rb的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完成所有工作后，我能够成功连接MySql。
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，写：
gem install mysql2。

在ActiveRecord层下构建MySql数据库与Ruby的成功连接的代码：


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

Ruby抛出的Mysql适配器ActiveRecord：'数据包乱序'

1 个答案: