find_in_whole_db.rb

found_records = []
ActiveRecord::Base.connection.tables.each do |table|
  klass = table.classify.constantize rescue next
  klass.send(:columns).select{|col| col.type == :string}.collect(&:name).each do |column|
    res = klass.all(:conditions => ["`#{table}`.#{column} like ?", "%bocrgk%"])
    found_records << res if res.any?
  end
end

p found_records