multiple database swiching real time - mysql

Question

please an example for use multiple data bases for my app in rails, i need create and save only one table internal and external, no all database so any idea or example explicit please??
i use mysql, the replication i dont like because is for all database and i need use only one table external.
tnks!

Answer 1

If I'm interpreting your question correctly, you want to know how to use a different database for one or more models in your app.
You can do this quite simply in Rails. First, you'll have to create another entry in your config/database.yml file:
production:
....
development:
...
test:
...
# Our external database
external:
adapter: mysql
host: some_host
username: some_username
password: some_password
database: some_db
Then, in your model, simply tell Rails that for this particular model, use a different connection:
class MyModel < ActiveRecord::Base
establish_connection :external
end
This will send any queries for MyModel to the external database, while all other models will use the production/development database as usual.
Please note that when you're using two different databases together, MySQL itself will not let you perform certain functions, such as joins. Otherwise, you should be fine with this approach.

Answer 2

well my solution is the next with help vonconrad post.
database.yml
like of vonoconrad post
MyModelconn.rb
class MyModelconnection < ActiveRecord::Base
# No corresponding table in the DB.
self.abstract_class = true
# Open a connection to the appropriate database depending
# on what RAILS_ENV is set to.
establish_connection(:connyml)
end
class User < ActiveRecord::Base
end
In users_controller.rb where i need insert into in external table with data values where i save in my Active Record of usres internal so an external swicht conection next line:
MyModelconn.connection.execute('INSERT INTO 'users' (fileld1,filed2)VALUES('#{lcfield1}','#{lcfield2}')')
and BINGO! workiT! perfect!
So dont need you again swicht back AR internal.