PostgreSQL can support a variety of procedural languages. Before you can use a procedural language, you have to install it into the database. Fortunately, this is a simple procedure.
The createlang shell script installs PL/pgSQL into a database. If you install PL/pgSQL in the template1 database, it will automatically be installed in all databases created from that template. The format for createlang is
createlang plpgsql database-name
To install PL/pgSQL in the movies database, execute the following command:
$ createlang plpgsql movies
Notice that this is a command-line utility, not a psql command.
Part I: General PostgreSQL Use
Introduction to PostgreSQL and SQL
Working with Data in PostgreSQL
PostgreSQL SQL Syntax and Use
Performance
Part II: Programming with PostgreSQL
Introduction to PostgreSQL Programming
Extending PostgreSQL
PL/pgSQL
The PostgreSQL C APIlibpq
A Simpler C APIlibpgeasy
The New PostgreSQL C++ APIlibpqxx
Embedding SQL Commands in C Programsecpg
Using PostgreSQL from an ODBC Client Application
Using PostgreSQL from a Java Client Application
Using PostgreSQL with Perl
Using PostgreSQL with PHP
Using PostgreSQL with Tcl and Tcl/Tk
Using PostgreSQL with Python
Npgsql: The .NET Data Provider
Other Useful Programming Tools
Part III: PostgreSQL Administration
Introduction to PostgreSQL Administration
PostgreSQL Administration
Internationalization and Localization
Security
Replicating PostgreSQL Data with Slony
Contributed Modules
Index