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Although most RDBMS vendors support integrity constraint checking in the database these days (Oracle implemented this feature a number of years ago), it is sometimes also desirable to implement constraint checking in client-side database applications. Suppose you have a network between a client-side dataentry application and the database, and the network connection is a bottleneck. In that case, client-side constraint checking probably results in much better response times, because there is no need to access the database each time to check the constraints. Code-generating tools typically allow you to specify whether constraints should be enforced at the database side, the client side, or both sides.

Use production numbers as file names: Enabled Use production numbers as new image keys: Enabled Copy production numbers to Concordance: Enabled Beginning field: PRODBEG Ending field: PRODEND Data will be overwritten in fields

This view provides a means to add snippets that are the results of complete controller actions within our template. We ll show how to do this using the Template Toolkit, but this should also work with any other templating system that will work with Catalyst. Catalyst::View::Component::Subinclude is implemented as a Moose role, so the style with which we write the view is a little bit different from that presented elsewhere in the book. Starting with MyApp.pm, we can make the view: package MyApp::View::Web; use Moose; use namespace::autoclean; extends 'Catalyst::View::TT'; with 'Catalyst::View::Component::SubInclude'; __PACKAGE__->config( TEMPLATE_EXTENSION => '.tt', WRAPPER => 'wrapper.tt', ); 1; Next, we change the use Catalyst qw/ ... lines in MyApp.pm to add Catalyst::Plugin:: SubRequest (the default subrequest mechanism is Catalyst::Plugin::SubRequest): use Catalyst qw/-Debug ConfigLoader Static::Simple SubRequest/; We need the file wrapper.tt to reflect our configuration. We show one way of conditionally applying a different wrapper based on the presence of the subreq stash key here. [% IF ! subreq %] <html><body> <pre> #### BEGIN WRAPPER [% content %] #### END WRAPPER </pre> [% ELSE; content; END %] Then we ll make a snippet.tt template: # here's our subrequest! and an index.tt template: ## We'll include the subrequest below: [% subinclude('/snippet') %]

Caution If you implement certain constraints in your client-side applications only, you risk database users bypassing the corresponding constraint checks by using alternative ways to connect to the database.

The next dialog, Header & Footer, controls how Opticon treats the header and footer of each image (see Figure 14-12). Selections from this dialog are copied directly onto images during the production and become a permanent artifact of the files.

To finish this section about relational data structures, there is another interesting way to look at tables and rows in a relational database from a completely different angle, as introduced by Hugh Darwen. This approach is more advanced than the other topics addressed in this chapter, so you might want to revisit this section later. You can associate each relational table with a table predicate and all rows of a table with corresponding propositions. Predicates are logical expressions, typically containing free variables, which evaluate to true or false. For example, this is a predicate: There is a course with title T and duration D, price P, frequency F, and a maximum number of attendees M.

Now we have to make a Root controller that will render these templates. We change the generated index action and add the snippet action as follows: sub index :Path :Args(0) { my ( $self, $c ) = @_; } sub snippet :Local { my ($self, $c) = @_; if (ref($c->engine) =~ /SubRequest/ ) { $c->stash->{subreq} = 1 ; } } From here we can run the test server. If we request http://localhost:3000, we get the following output: #### BEGIN WRAPPER ## We'll include the subrequest below: # here's our subrequest! #### END WRAPPER If we request http://localhost:3000/snippet, we get the following: #### BEGIN WRAPPER # here's our subrequest! #### END WRAPPER

If we replace the five variables in this predicate (T, D, P, F, and M) with actual values, the result is a proposition. In logic, a proposition is a predicate without free variables; in other words, a proposition is always true or false. This means that you can consider the rows of a relational table as the set of all propositions that evaluate to true.