如何在Ruby on Rails中连接MySQL？

Question

我是Ruby on Rails的新手.我已阅读本教程,听起来非常简单.

但是我如何连接到我的数据库(MySQL)或Rails使用什么？在php我会用...

mysql_connect("...","...","...");
mysql_select_db("...");

我搜索了谷歌,找不到任何有用的提示.

Answer 1

看看配置文件 config/database.yml

您需要在那里设置配置.以下是生产环境的示例:

production: 
   adapter: mysql2
   encoding: utf8 
   database: example 
   pool: 10 
   username: example 
   password: secure 
   socket: /var/run/mysqld/mysqld.sock 
   reconnect: true

除此之外,你必须添加gem 'mysql2'你的Gemfile并运行bundle install.

Answer 2

您不必手动执行这些操作,请查看:http://guides.rubyonrails.org/configuring.html#configuring-a-database

Answer 3

我的config/database.yml文件内容:

# Ensure the MySQL gem is defined in your Gemfile
#   gem 'mysql2'
#
# Install MySql gem if not already there.
# Below command installs some pre-requisites for the installation:
#   sudo apt-get install libmysqlclient-dev mysql-client
# After above, this to finish gem installation:
#   gem install mysql2
#
# And be sure to use new-style password hashing:
#   http://dev.mysql.com/doc/refman/5.0/en/old-client.html

development:
  adapter: mysql2
  encoding: utf8
  reconnect: false
  database: YOUR_DATABASE_HERE
  pool: 5
  username: root
  password: root

正如配置上面的注释所说,您可能需要首先通过终端安装mysql2 gem.安装完成后,执行a bundle install,rake db:migrate然后也可以通过phpmyadmin访问数据库.

一小时前我刚刚发现了这个问题,两年多以后问这个问题.虽然我明白这已经很晚了,并且OP肯定已经解决了这个问题,为了像我这样的其他初学者用户可能会来这里寻求解决方案,我想在这里编写我的解决方案.希望能帮助到你.