PL/Lua is an implementation of Lua as a loadable procedural language
for PostgreSQL: with PL/Lua you can use PostgreSQL functions and
triggers written in the Lua programming language.
PL/Ruby is a loadable procedural language for the PostgreSQL database
system (7.0 or later) that enables to write functions and trigger
procedures in Ruby.
plv8js is a procedural language add-on for PostgreSQL,
which means you can define JavaScript functions
that run inside a PostgreSQL server using google V8 Engine.
HyperSQL
HSQLDB is the leading SQL relational database engine written in Java. It has a
JDBC driver and supports a rich subset of ANSI-92 SQL (BNF tree format) plus
SQL 99 and 2003 enhancements. It offers a small (less than 100k in one version
for applets), fast database engine which offers both in-memory and disk-based
tables and supports embedded and server modes. Additionally, it includes tools
such as a minimal web server, in-memory query and management tools (can be run
as applets) and a number of demonstration examples.
This is the port for all stuff that comes in the contrib subtree of
the postgresql distribution. This subtree contains porting tools,
analysis utilities, and plug-in features that are not part of the core
PostgreSQL system, mainly because they address a limited audience or
are too experimental to be part of the main source tree. This does
not preclude their usefulness.
Each subdirectory contains a README file with information about the
module. Some directories supply new user-defined functions, operators,
or types. After you have installed the files you need to register the
new entities in the database system by running the commands in the
supplied .sql file. For example,
$ psql -d dbname -f module.sql
The .sql files are installed into /usr/local/share/postgresql/contrib
For more information, please see
/usr/local/share/doc/postgresql/contrib/README*
This software is part of the standard PostgreSQL distribution.