DBI :: InterfaceError：ドライバ（初期化されていない定数MysqlError）をロードできませんでした

Question

私は、次のコードを実行したときに私はこのエラーを取得し、

require 'rubygems' 
require "dbi" 
require 'dbd-mysql' 
dbh = DBI.connect("DBI:Mysql:TestDB:localhost","username", "pwd") 

1.9.2-p180 :001 > require 'rubygems' 
=> false 
1.9.2-p180 :002 > require "dbi" 
=> false 
1.9.2p180 :003 > require 'dbd-mysql' 
LoadError: no such file to load -- dbd-mysql 
from /.rvm/gems/ruby-1.9.2-p180@rails3/gems/dbi-0.4.5/lib/dbi.rb:318:in `rescue in load_driver' 
    from /.rvm/gems/ruby-1.9.2-p180@rails3/gems/dbi-0.4.5/lib/dbi.rb:242:in `load_driver' 
    from /.rvm/gems/ruby-1.9.2-p180@rails3/gems/dbi-0.4.5/lib/dbi.rb:160:in `_get_full_driver' 
    from /.rvm/gems/ruby-1.9.2-p180@rails3/gems/dbi-0.4.5/lib/dbi.rb:145:in `connect' 
    from (irb):3 
    from /.rvm/gems/ruby-1.9.2-p180@rails3/gems/railties-3.1.1/lib/rails/commands/console.rb:45:in `start' 
    from /.rvm/gems/ruby-1.9.2-p180@rails3/gems/railties-3.1.1/lib/rails/commands/console.rb:8:in `start' 
    from /.rvm/gems/ruby-1.9.2-p180@rails3/gems/railties-3.1.1/lib/rails/commands.rb:40:in `<top (required)>' 
    from script/rails:6:in `require' 
    from script/rails:6:in `<main>' 

1.9.2-p180 :004 > dbh = DBI.connect("DBI:Mysql:TestDB:localhost","username", "pwd") 
DBI::InterfaceError: Could not load driver (uninitialized constant MysqlError) 
    from /.rvm/gems/ruby-1.9.2-p180@rails3/gems/dbi-0.4.5/lib/dbi.rb:318:in `rescue in load_driver' 
    from /.rvm/gems/ruby-1.9.2-p180@rails3/gems/dbi-0.4.5/lib/dbi.rb:242:in `load_driver' 
    from /.rvm/gems/ruby-1.9.2-p180@rails3/gems/dbi-0.4.5/lib/dbi.rb:160:in `_get_full_driver' 
    from /.rvm/gems/ruby-1.9.2-p180@rails3/gems/dbi-0.4.5/lib/dbi.rb:145:in `connect' 
    from (irb):3 
    from /.rvm/gems/ruby-1.9.2-p180@rails3/gems/railties-3.1.1/lib/rails/commands/console.rb:45:in `start' 
    from /.rvm/gems/ruby-1.9.2-p180@rails3/gems/railties-3.1.1/lib/rails/commands/console.rb:8:in `start' 
    from /.rvm/gems/ruby-1.9.2-p180@rails3/gems/railties-3.1.1/lib/rails/commands.rb:40:in `<top (required)>' 
    from script/rails:6:in `require' 
    from script/rails:6:in `<main>' 
1.9.2-p180 :004 > 

を宝石、レールコンソール上

dbd-mysql (0.4.4) 
dbi (0.4.5) 
mysql (2.8.1) 

が含まれています

LoadError: no such file to load -- dbd-mysql 
DBI::InterfaceError: Could not load driver (uninitialized constant MysqlError) 

私のdbd-mysqlの宝石は正しくインストールされていませんか？ この問題を解決する方法を教えてください。

Answer 1

私があなただったら、私はその後、私は