Software Catalogue - Procedural languages

PL/Java is a free and open-source add-on module that brings Java™ functions, triggers, aggregates, types, operators, etc. to the PostgreSQL™ backend via the standard JDBC interface.

Maintenance of the corresponding SQL declarations can be automated through annotations in the Java source, generating the necessary SQL when the Java sources are compiled.

plPHP stands for Procedural Language PHP. The language has the PHP engine at its core and provides PHP scripting support for procedures and functions in PostgreSQL. Written by Command Prompt, Inc. plPHP is Open Source and licensed under the PHP license and the PostgreSQL (BSD) License.

Procedural language based on the R statistical language

PL/Ruby is a loadable procedural language for the Postgres database system that enable the Ruby language to create functions and trigger procedures

PL/sh is a procedural language handler for PostgreSQL that allows you to write stored procedures in a shell of your choice. For example,

CREATE FUNCTION concat(text, text) RETURNS text AS '
#!/bin/sh
echo "$1$2"
' LANGUAGE plsh;

The first line must be a #!-style line that indicates the shell to use. The rest of the function body will be executed by that shell in a separate process. The arguments are available as $1, $2, etc., as usual. (This is the shell's syntax. If your shell uses something different then that's what you need to use.) The return value will become what is printed to the standard output. If anything is printed to the standard error, then the function aborts with an error and the message is printed. If the script does not exit with status 0 then an error is raised as well.

The shell script can do anything you want, but you can't access the database. Trigger functions are also possible, but they can't change the rows. Needless to say, this language should not be declared as TRUSTED.