你能在 Rails 中获取数据库用户名、密码、数据库名称吗? [英] Can you get DB username, pw, database name in Rails?

问题描述

我正在编写一个 rake 任务，它在 Rails/ActiveRecord 之外执行一些数据库工作.

I'm writing a rake task that does some DB work outside of Rails/ActiveRecord.

有没有办法获取database.yml中定义的当前环境的数据库连接信息(主机、用户名、密码、数据库名称)?

Is there a way to get the DB connection info (host, username, password, DB name) for the current environment as defined in database.yml?

我想得到它，这样我就可以用它来像这样连接...

I'd like to get it so I can use it to connect like this...

con = Mysql.real_connect("host", "user", "pw", "current_db")

推荐答案

在 rails 中，您可以创建一个配置对象并从中获取必要的信息:

From within rails you can create a configuration object and obtain the necessary information from it:

config   = Rails.configuration.database_configuration
host     = config[Rails.env]["host"]
database = config[Rails.env]["database"]
username = config[Rails.env]["username"]
password = config[Rails.env]["password"]

有关 Rails::Configuration 的详细信息，请参阅 文档.

See the documentation for Rails::Configuration for details.

这只是使用 YAML::load 从数据库配置文件 (database.yml)，您可以使用它从 rails 环境外部获取信息:

This just uses YAML::load to load the configuration from the database configuration file (database.yml) which you can use yourself to get the information from outside the rails environment:

require 'YAML'
info = YAML::load(IO.read("database.yml"))
print info["production"]["host"]
print info["production"]["database"]
...

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