DBの接続設定ファイル hoge/config/database.yml 中に development: adapter: mysql database: mysql timeout: 5000 host: localhost username: root password: hoge encoding: utf8 test: adapter: mysql database: mysql timeout: 5000 host: localhost username: root password: hoge encoding: utf8 production: adapter: mysql database: mysql timeout: 5000 host: localhost username: root password: hoge en