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Note Using surrogate keys comes with advantages and disadvantages, and fierce debates between database experts. This section is intended to only explain the terminology, without offering an opinion on the use of surrogate keys.

Next, for both examples of an ActionClass (the Serialize and Secure ones), we can substitute use Moose with use Moose::Role. The functionality will remain the same, but as a role it is not inherited in the normal way that inheritance works (it s more like bolted-on functionality, whereas in inheritance, if A inherits from B, B is a superset of A), we don t have the limitations caused by the multiple inheritance model described earlier. However, we do need to move the namespace for the two attribute modules. Previously we had MyApp::Action::SerializeStash and MyApp::Action::EnsureEncryption; now we need to move the module namespace to MyApp::Action::Role::SerializeStash and MyApp::Action::Role:: EnsureEncryption, respectively. We change the line in the Controller classes where we want access to our custom attributes from extends 'Catalyst::Controller'; to BEGIN {extends 'Catalyst::Controller:: ActionRole'; }. Note that we have to use the BEGIN block because the setup of subroutine attributes occurs at compile time, but under normal circumstances extends does processing at runtime. The need to create a BEGIN block will be removed in some future version of Catalyst:: Controller::ActionRole, but it is required for the time being. Finally, we can call our code with multiple attributes. Catalyst::Controller::ActionRole provides us with the Does attribute. We can call each ActionRole together in the same subroutine: sub for_coders : Path('l33t') Args(0) Does('EnsureEncryption') Does('SerialiseStash') { # ... Catalyst::Controller::ActionRole will look for action classes in the Action::Role namespace (relative to the current application s namespace). Early versions of ActionRole needed a tilde (~) symbol for this functionality, but this is no longer a requirement. If no suitable module is found there, the namespace search moves to Catalyst::Action::Role. If you re storing action classes outside either of these namespaces, you ll have to use a + symbol to denote a fully qualified namespace, as described previously.

Delete: Deletes the reference to the image from the imagebase. Image references cannot be restored from the tool once they ve been deleted. In fact, there s no method in Opticon to create a reference to an image, other than loading data from a valid Opticon log file. Save: Saves settings for the currently highlighted image. You must click this button each time an image s data is to be written to the imagebase. Updating an image s settings and then highlighting another image in the list without saving causes updated values to be lost. When updating several images, you must save each image s settings individually.

A relational table can also have one or more foreign keys. Foreign key constraints are subset requirements; the foreign key values must always be a subset of a corresponding set of primary key values. Some typical examples of foreign key constraints are that an employee can work for only an existing department and can report to only an existing manager. Foreign keys implement referential integrity in a relational database.