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Phred (5358)


Fred is a Perl and PostgreSQL geek. He has made some very small contributions to a few cpan modules and mod_perl.

Journal of Phred (5358)

Friday August 05, 2005
04:43 PM

Procedural Language Perl (PLPerl)

[ #26129 ]

In my latest adventures in code I've been using PLPerlNG, which is a Perl procedural language for the PostgreSQL database. In the past when I've needed to munge data before creating a new object with Class::DBI, I override the create method or create a before_create trigger.

I wanted to try something different this time, so after some frustration with trying to get this particular trigger working in the plpgsql language, I decided to write it in PLPerl. For this implementation, I have an image table which I map locations of images to, and if the application does not provide a name for the image I use the filename sans extension for the name. Here's the code:

CREATE OR REPLACE FUNCTION image_insert() RETURNS trigger as $$
    if ( ! defined $_TD->{new}{name} || $_TD->{new}{name} eq '') {

        # Assign the name of the file to name of the image if no name specified
        ($_TD->{new}{name}) = $_TD->{new}{uri} =~ m{([^/]*)\.\w+$};
        return "MODIFY"; # Modify tuple and proceed INSERT/UPDATE command
    } else {

        return; # Proceed INSERT/UPDATE command
language plperl;

CREATE TRIGGER image_insert
    EXECUTE PROCEDURE image_insert();

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