plPerlNG (Next Generation) provides facilities to write user-defined functions and triggers in Perl for the PostgreSQL database. It is available under the PostgreSQL/BSD license.
CREATE OR REPLACE FUNCTION immortal() RETURNS trigger AS '
if ($_TD->{"old"}{"v"} eq $_TD->{"args"}{0}){
return "SKIP"; # Skip DELETE command
} else {
return; # Proceed DELETE command
}
' LANGUAGE 'plperl';
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