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Recall the LolCatalyst-Lite application from 4. We had two separate views, the Web (Template Toolkit) view and the Web Service (JSON) view. Originally, we called the translate_ service action in our Root controller, which is fine for the very simple original web service. However, if we wanted to extend the web service, things would become pretty unwieldy in short order. Fortunately, fixing this issue is fairly quick. First, we can write the new controller: package LolCatalyst::Lite::Controller::Translate::Service; use strict; use warnings; use parent qw(LolCatalyst::Lite::Controller::Translate); sub base :Chained('/') :PathPart('translate/service') :CaptureArgs(0) { my ($self, $c) = @_; $self->next::method($c); $c->stash(current_view => 'Service'); } 1;

You can add methods to user-defined datatypes. Methods are operations specifically developed to work with your user-defined datatypes; for example, to specify how you want to compare two address type values, or how you want to sort address values. Methods add a lot of semantic power to your user-defined datatypes. Unfortunately we can t spend much time on methods in this book, because you need a great deal of PL/SQL programming to create methods. If you want to see some method examples, check out the CUSTOMERS table of the OE schema, one of the standard sample schemas that ships with the Oracle software. As you will see in the next section, as soon as you create a user-defined datatype in Oracle, you implicitly get one method for free a method with the same name as the datatype itself. That method is the constructor method, which allows you to create occurrences of the datatype.

For the examples mentioned so far in this chapter, you could argue that you could implement them very well with standard relational techniques, as discussed in previous chapters of this book. You could separate various phone numbers into separate columns, you could create a separate ERRATA table with a foreign key constraint referring to the COURSES table, and so on. So when should you choose an object-relational approach rather than a pure relational approach It might be a matter of taste, and discussions about taste are probably a waste of time in a technical book like this one. As the Romans said, De gustibus non disputandum est... (That phrase translates to: There is no disputing about tastes ) It might be the case that you have a powerful object-oriented design and development environment. You may find that Oracle s object-relational features enable you to maintain an intuitive and straightforward mapping between that development environment and the Oracle database structures. In any case, this book does not speculate about when one approach is better than the other. The examples in this chapter have a single purpose: to illustrate the object-relational features of the Oracle DBMS. As you read about the techniques described in this chapter, you may wonder whether they violate the first normal form as one of the foundations of the relational model. That is not the case. The relational model does not forbid in any way storing complex or set-valued attributes in your rows. Data atomicity is a rather slippery concept. For example, if you consider DATE values, aren t you looking at a compound datatype A DATE value has meaningful subcomponents, such as year, month, and day. For a thorough treatment of this subject, see An Introduction to Database Systems, 8th Edition by Chris Date (Addison Wesley, 2003).

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This is pretty neat, but we can take it further, as we want identical dispatch logic for the public action /translate/service to the original controller but with just a different view. We can remove the action declaration and move everything into the package configuration: package LolCatalyst::Lite::Controller::Translate::Service; use strict; use warnings; use parent qw(LolCatalyst::Lite::Controller::Translate); __PACKAGE__->config( current_view => 'Service', actions => { base => { PathPart => 'translate/service' }, }, ); 1; We will want to write tests to cover this functionality in t/controller_Translate_Service.t as well. These tests are in fact very similar to the tests in t/controller_Translate.t, so we present the following patch in unified diff format to make the differences between the two test files clear: --- t/controller_Translate.t 2009-04-26 00:51:37.000000000 +1000 +++ t/controller_Translate_Service.t 2009-04-26 00:51:37.000000000 +1000 @@ -9,7 +9,7 @@ my ($request, $response); $request = POST( 'http://localhost/translate', 'http://localhost/translate/service', 'Content-Type' => 'form-data', 'Content' => [ 'lol' => 'Can i have a cheese burger ', @@ -17,11 +17,11 @@ + ok( $response = request($request), 'Request'); ok( $response->is_success, 'Response Successful 2xx' ); -is( $response->content_type, 'text/html', 'Response Content-Type' ); +is( $response->content_type, 'application/json', 'Response Content-Type' ); like( $response->content, qr/CHEEZ/, "contains translated string");