项目目录下/config/database.yml
default: &default
adapter: mysql2
pool: 5
timeout: 5000
username: root
password: 密码
socket: /var/run/mysqld/mysqld.sock
host: 127.0.0.1
port: 3306
development:
<<: *default
database: 数据库名字
根目录Gemfile文件编辑在最下面添加一行
gem 'mysql2'
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