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Learning PostgreSQL

You're reading from  Learning PostgreSQL

Product type Book
Published in Nov 2015
Publisher Packt
ISBN-13 9781783989188
Pages 464 pages
Edition 1st Edition
Languages
Concepts

Table of Contents (21) Chapters

Learning PostgreSQL
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
1. Relational Databases 2. PostgreSQL in Action 3. PostgreSQL Basic Building Blocks 4. PostgreSQL Advanced Building Blocks 5. SQL Language 6. Advanced Query Writing 7. Server-Side Programming with PL/pgSQL 8. PostgreSQL Security 9. The PostgreSQL System Catalog and System Administration Functions 10. Optimizing Database Performance 11. Beyond Conventional Data types 12. Testing 13. PostgreSQL JDBC 14. PostgreSQL and Hibernate Index

Functions

A PostgreSQL function is used to provide a distinct service, and is often composed of a set of declarations, expressions, and statements. PostgreSQL has very rich built-in functions for almost all the existing data types. In this chapter, we will focus on user-defined functions. However, details about the syntax and function parameters will be covered in the following chapters.

PostgreSQL native programming languages

PostgreSQL supports out-of-the-box user-defined functions to be written in C, SQL and PL/pgSQL. There are also three other procedural languages that come with the standard PostgreSQL distribution: PL/Tcl, PL/Python, and PL/Perl. However, one needs to create the language in order to use them via the CREATE EXTENSION PostgreSQL command or via the createlang utility tool.

The simplest way to create a language and make it accessible to all the databases is to create it in template1, directly after the PostgreSQL cluster installation. Note that one does not need to perform...

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