Show configuration page before database load

[Jeff Jount]

I'm trying to let the user configure database info, i have followed this guide:http://burtbeckwith.com/blog/?p=1565 , but i'm not sure how to load the form and set database configuration based on that form submit (perhaps modifying a file and make datasource.groovy read from that file).

I'm using grails 2.4.4 and multiple datasources.

Been looking around and this is exactly what i'm trying to achieve, but no luck with those answers:

• How to make a initial view to configure the database connection in grails?
  
• Grails : start the application without connecting to database
  
• How can I execute code before DataSource.groovy is evaluated in Grails?

Any help with this?

Thanks