將MySQL連接到Ruby on Rails - ActiveRecord :: ConnectionNotEstablished

我將MySQL Workbench與現有數據庫一起安裝，隨時可以使用。我安裝了Rails和配置我的database.yml文件閱讀：將MySQL連接到Ruby on Rails - ActiveRecord :: ConnectionNotEstablished

development: 
    adapter: mysql2 
    encoding: utf8 
    database: unibands 
    pool: 5 
    username: root 
    password: 
    host: localhost

然而，導航到任何地方http://localhost:3000，我有錯誤時，映入眼簾：ActiveRecord::ConnectionNotEstablished

在終端中輸入「Full」錯誤讀：

Started GET "/pins/index" for 127.0.0.1 at 2013-12-20 19:47:12 +0000 

ActiveRecord::ConnectionNotEstablished (ActiveRecord::ConnectionNotEstablished): 
    activerecord (4.0.2) lib/active_record/connection_adapters/abstract/connection_pool.rb:546:in `retrieve_connection' 
    activerecord (4.0.2) lib/active_record/connection_handling.rb:79:in `retrieve_connection' 
    activerecord (4.0.2) lib/active_record/connection_handling.rb:53:in `connection' 
    activerecord (4.0.2) lib/active_record/query_cache.rb:51:in `restore_query_cache_settings' 
    activerecord (4.0.2) lib/active_record/query_cache.rb:43:in `rescue in call' 
    activerecord (4.0.2) lib/active_record/query_cache.rb:32:in `call' 
    activerecord (4.0.2) lib/active_record/connection_adapters/abstract/connection_pool.rb:626:in `call' 
    activerecord (4.0.2) lib/active_record/migration.rb:369:in `call' 
    actionpack (4.0.2) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call' 
    activesupport (4.0.2) lib/active_support/callbacks.rb:373:in `_run__4325676049139756285__call__callbacks' 
    activesupport (4.0.2) lib/active_support/callbacks.rb:80:in `run_callbacks' 
    actionpack (4.0.2) lib/action_dispatch/middleware/callbacks.rb:27:in `call' 
    actionpack (4.0.2) lib/action_dispatch/middleware/reloader.rb:64:in `call' 
    actionpack (4.0.2) lib/action_dispatch/middleware/remote_ip.rb:76:in `call' 
    actionpack (4.0.2) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call' 
    actionpack (4.0.2) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call' 
    railties (4.0.2) lib/rails/rack/logger.rb:38:in `call_app' 
    railties (4.0.2) lib/rails/rack/logger.rb:20:in `block in call' 
    activesupport (4.0.2) lib/active_support/tagged_logging.rb:67:in `block in tagged' 
    activesupport (4.0.2) lib/active_support/tagged_logging.rb:25:in `tagged' 
    activesupport (4.0.2) lib/active_support/tagged_logging.rb:67:in `tagged' 
    railties (4.0.2) lib/rails/rack/logger.rb:20:in `call' 
    actionpack (4.0.2) lib/action_dispatch/middleware/request_id.rb:21:in `call' 
    rack (1.5.2) lib/rack/methodoverride.rb:21:in `call' 
    rack (1.5.2) lib/rack/runtime.rb:17:in `call' 
    activesupport (4.0.2) lib/active_support/cache/strategy/local_cache.rb:83:in `call' 
    rack (1.5.2) lib/rack/lock.rb:17:in `call' 
    actionpack (4.0.2) lib/action_dispatch/middleware/static.rb:64:in `call' 
    rack (1.5.2) lib/rack/sendfile.rb:112:in `call' 
    railties (4.0.2) lib/rails/engine.rb:511:in `call' 
    railties (4.0.2) lib/rails/application.rb:97:in `call' 
    rack (1.5.2) lib/rack/lock.rb:17:in `call' 
    rack (1.5.2) lib/rack/content_length.rb:14:in `call' 
    rack (1.5.2) lib/rack/handler/webrick.rb:60:in `service' 
    /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service' 
    /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run' 
    /usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread' 


    Rendered /usr/local/rvm/gems/ruby-1.9.3-p392/gems/actionpack-4.0.2/lib/action_dispatch/middleware/templates/rescues/_source.erb (0.5ms) 
    Rendered /usr/local/rvm/gems/ruby-1.9.3-p392/gems/actionpack-4.0.2/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.1ms) 
    Rendered /usr/local/rvm/gems/ruby-1.9.3-p392/gems/actionpack-4.0.2/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (0.9ms) 
    Rendered /usr/local/rvm/gems/ruby-1.9.3-p392/gems/actionpack-4.0.2/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (14.3ms)

我在Mac（OS小牛）使用Rails 4.0.2

我f我將連接更改爲默認的sqlite3，它呈現頁面。所以這絕對是我的數據庫連接問題。我是Rails新手，所以它可能是一個簡單的修復，但似乎沒有任何工作適合我。

來源

2013-12-20 Michael Giovanni Pumo

你是否偶然使用MAMP或WAMP？如果是，請確保您放置了正確的套接字 –

您是否創建了MySQL數據庫？另外，你是否能夠使用這種憑據連接到數據庫？ –

我沒有使用MAMP。如果我打開MySQL Workbench，我可以在那裏訪問數據庫並查詢它。有沒有我需要的Rails使用這個套接字？ –

如果您使用的甲基苯丙胺加在你的database.yml

socket: /Applications/MAMP/tmp/mysql/mysql.sock

Mysql的默認下安裝插座/tmp/mysql.soc 所以嘗試，因爲你沒有運行MAMP

socket: /tmp/mysql/mysql.sock

來源

2013-12-20 20:00:04

我沒有使用MAMP。如果我需要某種套接字，我可以在哪裏獲得這個文件？ –

運行％mysqladmin變量 –

您還可以鍵入-a mysql來查看mysql所在的位置 –

您可能需要爲MySQL安裝提供套接字。首先，通過以下的方法找到你的MySQL安裝路徑從以下命令行：

which mysql

然後，添加返回路徑的插座在database.yml文件：

# db/database.yml 
development: 
    socket: /path/to/mysql/mysql.sock

重新啓動您的Web服務器重新加載配置文件，並且問題應該得到解決。

來源

2013-12-20 20:14:26 zeantsoi

將MySQL連接到Ruby on Rails - ActiveRecord :: ConnectionNotEstablished

回答

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