Chapter 9. Accessing Databases
In many ways, the integration of a templating system and a database is natural. From e-commerce sites to Microsoft Word’s MailMerge, database-backed template processing is very common. Indeed, this integration is one of the primary selling points of many systems, such as ASP and PHP.
You can integrate the Template Toolkit with a database in several
ways. The most straightforward way is to simply use the DBI plugin. The
DBI plugin is part of the standard Template Toolkit distribution, and
provides a template-facing way to utilize Perl’s
DBI module (see Programming the Perl
DBI: Database Programming with Perl, by Alligator Descartes
and Tim Bunce (O’Reilly), for details about the
In addition to
database-related modules are on CPAN, such as
DBIx::SearchBuilder, that can be used to
abstract the database layer out of code. Using these modules from within
the Template Toolkit is the same as using them in Perl programs.
Writing your own abstraction layer is always an option as well. Many
people like to keep SQL out of application code, for the same reasons that
people prefer to keep business logic out of presentation templates; this
is the primary purpose of a database abstraction layer. Many SQL-related
helper modules are on CPAN, such as
SQL::AnchoredWildcards, that can be used to help
provide a non-SQL interface to a database.
Using the DBI Plugin
The DBI plugin provides ...