How to use 2 different database adapters (SQL Server and PostgreSQL) in Rails in the same environment?

问题

I'm working on a Rails 3 project which uses a PostgreSQL database.

I need to make queries on a remote SQL Server database sometimes (pure sql and stored procedures)

To do the trick I can use TinyTDS to access the SQL Server and execute queries:

development:
  adapter: sqlserver
  mode: dblib
  host: 123.123.123.123
  port: 1433
  database: the_db_name
  username: the_user
  password: the_pwd
  timeout: 5000

It's working well, but I don't know how to use the 2 different database adapters at the same time.

Is it possible? Or maybe there's an other way to do it?

回答1:

In your database.yml file add another "environment" block for your postgres connection

example environment name might be

postgres_development

Then in your environment.rb file add the following Line

[ModelName].establish_connection "postgres_#{RAILS_ENV}"

Where [ModelName] is the ActiveModel object you wish to specifically connect to the other database environment. I am not sure if this works in rails 3 100% but I know it works in rails 2

来源：https://stackoverflow.com/questions/8948913/how-to-use-2-different-database-adapters-sql-server-and-postgresql-in-rails-in