Create DB table by ActiveRecord::Migration

create_table.rb

class CreateTable < ActiveRecord::Migration
  def self.up
    create_table :a_tables do |t|
      t.column :name1, :integer, :null => false
      t.column :name2, :text,    :null => false
      t.timestamps
    end
  end

  def self.down
    drop_table :a_tables
  end
end