rake db：migrate的问题 –
我无法为Ruby on Rails设置我的MySQL数据库。 设置数据库并确保config / database.yml文件匹配后，我遇到了下面的错误消息。
U:\Rails\alpha>rake db:migrate --trace (in U:/Rails/alpha) ** Invoke db:migrate (first_time) ** Invoke environment (first_time) ** Execute environment ** Execute db:migrate rake aborted! Access denied for user 'admin'@'207-237-91-100.c3-0.avec-ubr13.nyr-avec.n y.cable.rcn.com' (using password: YES) C:/Ruby187/lib/ruby/gems/1.8/gems/mysql2-0.2.6-x86-mingw32/lib/mysql2/client.rb: 37:in `connect' C:/Ruby187/lib/ruby/gems/1.8/gems/mysql2-0.2.6-x86-mingw32/lib/mysql2/client.rb: 37:in `initialize' C:/Ruby187/lib/ruby/gems/1.8/gems/mysql2-0.2.6-x86-mingw32/lib/active_record/con nection_adapters/mysql2_adapter.rb:14:in `new' C:/Ruby187/lib/ruby/gems/1.8/gems/mysql2-0.2.6-x86-mingw32/lib/active_record/con nection_adapters/mysql2_adapter.rb:14:in `mysql2_connection' C:/Ruby187/lib/ruby/gems/1.8/gems/activerecord-3.0.1/lib/active_record/connectio n_adapters/abstract/connection_pool.rb:230:in `send' C:/Ruby187/lib/ruby/gems/1.8/gems/activerecord-3.0.1/lib/active_record/connectio n_adapters/abstract/connection_pool.rb:230:in `new_connection' C:/Ruby187/lib/ruby/gems/1.8/gems/activerecord-3.0.1/lib/active_record/connectio n_adapters/abstract/connection_pool.rb:238:in `checkout_new_connection' C:/Ruby187/lib/ruby/gems/1.8/gems/activerecord-3.0.1/lib/active_record/connectio n_adapters/abstract/connection_pool.rb:194:in `checkout' C:/Ruby187/lib/ruby/gems/1.8/gems/activerecord-3.0.1/lib/active_record/connectio n_adapters/abstract/connection_pool.rb:190:in `loop' C:/Ruby187/lib/ruby/gems/1.8/gems/activerecord-3.0.1/lib/active_record/connectio n_adapters/abstract/connection_pool.rb:190:in `checkout' C:/Ruby187/lib/ruby/1.8/monitor.rb:242:in `synchronize' C:/Ruby187/lib/ruby/gems/1.8/gems/activerecord-3.0.1/lib/active_record/connectio n_adapters/abstract/connection_pool.rb:189:in `checkout' C:/Ruby187/lib/ruby/gems/1.8/gems/activerecord-3.0.1/lib/active_record/connectio n_adapters/abstract/connection_pool.rb:96:in `connection' C:/Ruby187/lib/ruby/gems/1.8/gems/activerecord-3.0.1/lib/active_record/connectio n_adapters/abstract/connection_pool.rb:318:in `retrieve_connection' C:/Ruby187/lib/ruby/gems/1.8/gems/activerecord-3.0.1/lib/active_record/connectio n_adapters/abstract/connection_specification.rb:97:in `retrieve_connection' C:/Ruby187/lib/ruby/gems/1.8/gems/activerecord-3.0.1/lib/active_record/connectio n_adapters/abstract/connection_specification.rb:89:in `connection' C:/Ruby187/lib/ruby/gems/1.8/gems/activerecord-3.0.1/lib/active_record/migration .rb:486:in `initialize' C:/Ruby187/lib/ruby/gems/1.8/gems/activerecord-3.0.1/lib/active_record/migration .rb:433:in `new' C:/Ruby187/lib/ruby/gems/1.8/gems/activerecord-3.0.1/lib/active_record/migration .rb:433:in `up' C:/Ruby187/lib/ruby/gems/1.8/gems/activerecord-3.0.1/lib/active_record/migration .rb:415:in `migrate' C:/Ruby187/lib/ruby/gems/1.8/gems/activerecord-3.0.1/lib/active_record/railties/ databases.rake:142 C:/Ruby187/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `call' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `execute' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `each' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `execute' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_cal l_chain' C:/Ruby187/lib/ruby/1.8/monitor.rb:242:in `synchronize' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_cal l_chain' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:583:in `invoke' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2051:in `invoke_task' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `each' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_excep tion_handling' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2001:in `run' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_excep tion_handling' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:1998:in `run' C:/Ruby187/lib/ruby/gems/1.8/gems/rake-0.8.7/bin/rake:31 C:/Ruby187/bin/rake:19:in `load' C:/Ruby187/bin/rake:19 我已经检查了大约15次以上的密码，据我所知这是正确的。
database.yml文件：
development: adapter: mysql2 encoding: utf8 reconnect: false database: dbname pool: 5 username: admin password: pwhere host: sql.domain.com
谢谢
测试这种方法的一种方法是从rails所在的机器的命令行连接到mysql。 就像是
mysql -u admin -ppwhere -h sql.domain.com
您可能会发现无法以这种方式连接。 如果是这样，您可能会遇到GRANT问题，这可能是由于在GRANT中指定了错误的主机。 例如，如果DB和rails驻留在同一台机器上，mysql可能会认为您是从“localhost”连接而不是rails box的DNS名称（反之亦然）。
在开始时，您可能只想授予管理员用户访问所有内容的权限：
GRANT ALL ON *.* to 'admin'@'whereever_rails_lives' IDENTIFIED BY 'pwhere'
mysql授权语法
诀窍通常是’whereever_rails_lives’正确。
您的权限不正确。 这是一个蹩脚的错误，因为它真的意味着两件事。 1）您的密码/用户名组合错误; 另外，你无法连接到mysql，这可能严重意味着连接到gem问题，安装问题。 Mysql可以搞定！
从你的问题来看，我认为你对这一切都很陌生。 我建议的是，不要担心连接到MySQL，而是从sqlite开始。 您不需要全文搜索和精简版不提供的其他function！
那么，让我们开始使用sqlite3。 怎么样？
这工作少了。 只需制作一个rails应用程序，然后rake db:create就完成了。 然后，当您需要mysql数据库的function时，您可以真正了解在熟悉Rails和调试方面出现的错误。