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PostgreSQL 7.3 Documentation
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II. Server Programming

This second part of the manual explains the PostgreSQL approach to extensibility and describe how users can extend PostgreSQL by adding user-defined types, operators, aggregates, and both query language and programming language functions. After a discussion of the PostgreSQL rule system, we discuss the trigger and SPI interfaces.

Table of Contents
7. Architecture
7.1. PostgreSQL Architectural Concepts
8. Extending SQL: An Overview
8.1. How Extensibility Works
8.2. The PostgreSQL Type System
8.3. About the PostgreSQL System Catalogs
9. Extending SQL: Functions
9.1. Introduction
9.2. Query Language (SQL) Functions
9.3. Procedural Language Functions
9.4. Internal Functions
9.5. C Language Functions
9.6. Function Overloading
9.7. Table Functions
9.8. Procedural Language Handlers
10. Extending SQL: Types
11. Extending SQL: Operators
11.1. Introduction
11.2. Example
11.3. Operator Optimization Information
12. Extending SQL: Aggregates
13. The Rule System
13.1. Introduction
13.2. What is a Query Tree?
13.3. Views and the Rule System
13.4. Rules on INSERT, UPDATE and DELETE
13.5. Rules and Permissions
13.6. Rules and Command Status
13.7. Rules versus Triggers
14. Interfacing Extensions To Indexes
14.1. Introduction
14.2. Access Methods and Operator Classes
14.3. Access Method Strategies
14.4. Access Method Support Routines
14.5. Creating the Operators and Support Routines
14.6. Creating the Operator Class
14.7. Special Features of Operator Classes
15. Index Cost Estimation Functions
16. Triggers
16.1. Trigger Definition
16.2. Interaction with the Trigger Manager
16.3. Visibility of Data Changes
16.4. Examples
17. Server Programming Interface
17.1. Interface Functions
17.2. Interface Support Functions
17.3. Memory Management
17.4. Visibility of Data Changes
17.5. Examples
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