Documentation → PostgreSQL 8.4

Supported Versions: Current (17) / 16 / 15 / 14 / 13

Development Versions: devel

Unsupported versions: 12 / 11 / 10 / 9.6 / 9.5 / 9.4 / 9.3 / 9.2 / 9.1 / 9.0 / 8.4 / 8.3 / 8.2 / 8.1 / 8.0 / 7.4 / 7.3 / 7.2 / 7.1

This documentation is for an unsupported version of PostgreSQL.
You may want to view the same page for the current version, or one of the other supported versions listed above instead.

PostgreSQL 8.4.22 Documentation
Prev	Fast Backward		Fast Forward	Next

Chapter 35. Triggers

Table of Contents
35.1. Overview of Trigger Behavior
35.2. Visibility of Data Changes
35.3. Writing Trigger Functions in C
35.4. A Complete Example

This chapter provides general information about writing trigger functions. Trigger functions can be written in most of the available procedural languages, including PL/pgSQL (Chapter 38), PL/Tcl (Chapter 39), PL/Perl (Chapter 40), and PL/Python (Chapter 41). After reading this chapter, you should consult the chapter for your favorite procedural language to find out the language-specific details of writing a trigger in it.

It is also possible to write a trigger function in C, although most people find it easier to use one of the procedural languages. It is not currently possible to write a trigger function in the plain SQL function language.

Prev	Home	Next
Interfacing Extensions To Indexes	Up	Overview of Trigger Behavior