Ruby gem 无法加载 - 无法加载驱动程序“MySQL”

Question

我有一个已经运行多年的应用程序。然后我们将服务器迁移到 Ubuntu 15.04 并安装了 Ruby。

sudo apt-get install curl
sudo apt-get install ruby2.1
sudo gem update --system
sudo apt-get install rake
apt-get install ruby-dev
sudo gem install amatch
sudo apt-get install libmysqlclient-dev
sudo gem install -r dbi
sudo gem install -r mysql dbd-mysql

然后我们运行程序并得到这个错误..

/var/lib/gems/2.1.0/gems/dbi-0.4.5/lib/dbi.rb:300:in `block in load_driver': Unable to load driver 'MySQL' (underlying error: uninitialized constant DBI::DBD::MySQL) (DBI::InterfaceError)
    from /usr/lib/ruby/2.1.0/monitor.rb:211:in `mon_synchronize'
    from /var/lib/gems/2.1.0/gems/dbi-0.4.5/lib/dbi.rb:242:in `load_driver'
    from /var/lib/gems/2.1.0/gems/dbi-0.4.5/lib/dbi.rb:160:in `_get_full_driver'
    from /var/lib/gems/2.1.0/gems/dbi-0.4.5/lib/dbi.rb:145:in `connect'

程序本身（更改了用户名和密码）

#!/usr/bin/ruby
require "rubygems"
gem 'mysql'
gem 'dbi'
require "dbi"
require "amatch"

include Amatch

name_sub = {    "unit"          => "un",
                "unt"           => "un",
                "tract"         => "tr",
                "estate"        => "est",
                "university"    => "univ",
                "trust"         => "trst"  }

op_sub = {      "partnership"   => "PS",
                "partnershp"    => "PS",
                "partner"       => "PS",
                "prtnr"         => "PS",
                "ptnr"          => "PS",
                "ptnrsp"        => "PS",
                "corporation"   => "C",
                "corp"          => "C",
                "company"       => "co",
                "incorporation" => "I",
                "inc"           => "I",
                "oil"           => "O",
                "gas"           => "G",
                "exploration"   => "E",
                "production"    => "P",
                "operating"     => "oper",
                "energy"        => "engy",
                "management"    => "mgmt",
                "resources"     => "res",
                "minerals"      => "min",
                "petroleum"     => "pet"  }


def mangle(s, dictionary = {})
  return "" unless s
        # lowercase | special case        | alphanumerics only
        s.downcase().gsub(/l.l.c./, 'llc').gsub(/\W/, " ").split(" ").map do |word|
    dictionary.fetch(word, word)
  end.join(' ')
end

stop_attempts = -1
PRODUCTION = false

begin
        # now the actual code



  # development database
  DBI.connect("dbi:MySQL:database=matching;" "host=enus", "mott", "bM^7ezOqYyn") do |outdb|
  DBI.connect("dbi:MySQL:database=ownership;" "host=enus", "mott", "bM^7ezOqYyn") do |lease_db|

  # re-create phase3 table
    outdb.do("drop table if exists phase3")
    sql = "create table phase3 (" +
      "id bigint not null auto_increment primary key, " +
      "lod_id bigint, rrc_id bigint, district varchar(255), " +
      "name_percent float, rrc_lease_no varchar(255)," +
      "op_percent float, field_percent float, total float, " +
      "key k1 (lod_id), key k2 (rrc_id), key k3 (district), " +...

通过详尽的 Google 搜索找到了安装 dbd-mysql 的建议和其他建议，但均未奏效。

那么这里的失败是什么？我不是一个 Ruby 人，我是一个卑微的 IT 人，试图让它恢复并运行。

Answer 1

看起来在我的 Mac 上尝试此操作时区分大小写的文件系统存在一些问题，但我能够通过将连接字符串从“MySQL”更改为“Mysql”来进行测试，例如：

2.1.5@test_dbi ~$ cat test_dbi.rb 
#!/usr/bin/ruby
require "rubygems"
require 'dbi'
DBI.connect("dbi:Mysql:database=matching;" "host=enus", "mott", "bM^7ezOqYyn") 
2.1.5@test_dbi ~$ 

Answer 2

解决了这个问题。

核心故障是 Ruby 2.1.0 本身的错误代码。 请参阅此处以修复 Ruby 本身。 [DBI Row / delegate behavior between ruby 1.8.7 and 2.1

一旦我开始收到错误，我将 Mysql 的 DBI 调用更改为 MySQL 希望修复它，但这又导致了另一个问题。