SQLite Creating Table Dynamically - ruby

Question

I have a table in SQLite and when an entry is made in this table, I would like to create a new table for each entry in the first table. (I want to do this in Ruby On Rails, if that helps)
Here is an example to clarify what I am trying to achieve:
Assume there is a table: Campaigns
Campaigns
Campaign_ID, date, name
So if I make an entry:
01 06/12 FirstCampaign
is there a way to create a new table called: {Campaign_ID}_Page
i.e:
01_Page
(fields for this table go here)

Answer 1

Why do you need it?
I think it would be better to create a table Pages with a foreign key to your table Campaigns.
An example (I use Sequel):
require 'sequel'
DB = Sequel.sqlite
DB.create_table :Campaigns do
primary_key :id
column :campaign_id, :integer
column :date, :date
column :name, :string
end
DB.create_table :Pages do
primary_key :id
foreign_key :campaign_id, :Campaigns
column :text, :string
end
key = DB[:Campaigns].insert(:campaign_id => 01, :date=> Date.new(2012,1,1), :name => 'FirstCampaign')
DB[:Pages].insert(:campaign_id => key, :text => 'text for FirstCampaign')
key = DB[:Campaigns].insert(:campaign_id => 02, :date=> Date.new(2012,1,1), :name => 'SecondCampaign')
DB[:Pages].insert(:campaign_id => key, :text => 'text for SecndCampaign')
#All pages for 1st campaign
p DB[:Pages].filter(
:campaign_id => DB[:Campaigns].filter(:campaign_id => 1).first[:id]
).all
But to answer your question: You could try to use a model hook.
An example with Sequel:
require 'sequel'
DB = Sequel.sqlite
DB.create_table :Campaigns do
primary_key :id
column :campaign_id, :integer
column :date, :date
column :name, :string
end
class Campaign < Sequel::Model
def after_create
tabname = ("%05i_page" % self.campaign_id).to_sym
puts "Create table #{tabname}"
self.db.create_table( tabname ) do
foreign_key :campaign
end
end
end
p DB.table_exists?(:'01_page') #-> false, table does not exist
Campaign.create(:campaign_id => 01, :date=> Date.new(2012,1,1), :name => 'FirstCampaign')
p DB.table_exists?(:'00001_page') #-> true Table created
My example has no test, if the table already exist. If you really want to use it,