mysql 不适用于 Ruby on Rails答案

【问题标题】：mysql doesn't work with Ruby on Railsmysql 不适用于 Ruby on Rails
【发布时间】：2015-05-06 19:49:06
【问题描述】：

您好，我是 Ruby on Rails 的新手。我使用 Aptana Studio 创建了一个新项目，并使用 rails server 命令启动了服务器。但是当我尝试通过浏览器访问服务器时，出现以下错误。

http://i.stack.imgur.com/7P0FE.png

Access denied for user root@localhost (using password: NO)


      socket = socket.to_s unless socket.nil?

      connect user, pass, host, port, database, socket, flags
    end

def self.default_query_options

Rails.root：/home/tapas/RubyWorkspace/myproj

Application Trace | Framework Trace | Full Trace
mysql2 (0.3.18) lib/mysql2/client.rb:70:in `connect'
mysql2 (0.3.18) lib/mysql2/client.rb:70:in `initialize'
activerecord (4.2.1) lib/active_record/connection_adapters/mysql2_adapter.rb:18:in `new'
activerecord (4.2.1) lib/active_record/connection_adapters/mysql2_adapter.rb:18:in `mysql2_connection'
activerecord (4.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:438:in `new_connection'
activerecord (4.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:448:in `checkout_new_connection'
activerecord (4.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:422:in `acquire_connection'
activerecord (4.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:349:in `block in checkout'
/home/tapas/.rbenv/versions/2.2.2/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
activerecord (4.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:348:in `checkout'
activerecord (4.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:263:in `block in connection'
/home/tapas/.rbenv/versions/2.2.2/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
activerecord (4.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:262:in `connection'
activerecord (4.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:567:in `retrieve_connection'
activerecord (4.2.1) lib/active_record/connection_handling.rb:113:in `retrieve_connection'
activerecord (4.2.1) lib/active_record/connection_handling.rb:87:in `connection'
activerecord (4.2.1) lib/active_record/migration.rb:384:in `connection'
activerecord (4.2.1) lib/active_record/migration.rb:371:in `call'
actionpack (4.2.1) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.2.1) lib/active_support/callbacks.rb:88:in `call'
activesupport (4.2.1) lib/active_support/callbacks.rb:88:in `_run_callbacks'
activesupport (4.2.1) lib/active_support/callbacks.rb:776:in `_run_call_callbacks'
activesupport (4.2.1) lib/active_support/callbacks.rb:81:in `run_callbacks'

我尝试使用所有主机：端口组合，例如3000,3306..等，但没有任何效果。这是我的database.yml 文件的样子。

http://i.stack.imgur.com/a9ok1.png

development:
  adapter: mysql2
  encoding: utf8
  reconnect: false
  database: mysql_dev
  pool:5
  username: root
  password: tapaskumar
  socket: /var/run/mysqld/mysqld.sock
  host: localhost
  port: 3306

test:
  adapter: mysql2
  encoding: utf8
  reconnect: false
  database: mysql_test
  pool: 5
  username: root
  password: tapaskumar
  socket: /var/run/mysqld/mysqld.sock
  host: localhost
  port: 3306

production:
  adapter: mysql2
  encoding: utf8
  reconnect: false
  database: mysql2_prod
  pool: 5
  username: root
  password: tapaskumar
  socket: /var/run/mysqld/mysqld.sock
  host: localhost
  port: 3306

当我尝试从终端访问 mysql 时，它工作正常。我也使用这个命令安装了 mysql。

sudo apt-get install mysql-server mysql-client libmysqlclient-dev

并且还为该项目安装了 mysql gem。我无法弄清楚出了什么问题。

【问题讨论】：

好吧，对于初学者来说，您的应用似乎正在尝试在没有密码的情况下连接到 MySQL 数据库。不幸的是，我不能告诉你原因，但首先要仔细检查你的设置。
问题的标题可以更具描述性。
从命令行登录到 sql server 的命令是什么？您是否也将用户指定为“root”？

标签： mysql ruby-on-rails ruby database

【解决方案1】：

我之前正在编辑一些全局 database.yml 文件。然后我在项目目录的 config 文件夹中找到了一个特定的 database.yml 文件，我认为它是特定于该项目的。经过几次缩进错误后，终于明白了。

【讨论】：