Part V. Server Programming
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Part V. Server Programming

This part is about extending the server functionality with user-defined functions, data types, triggers, etc. These are advanced topics which should probably be approached only after all the other user documentation about LightDB has been understood. Later chapters in this part describe the server-side programming languages available in the LightDB distribution as well as general issues concerning server-side programming languages. It is essential to read at least the earlier sections of Chapter 36 (covering functions) before diving into the material about server-side programming languages.

Table of Contents

36. Extending SQL
36.1. How Extensibility Works
36.2. The LightDB Type System
36.3. User-Defined Functions
36.4. User-Defined Procedures
36.5. Query Language (SQL) Functions
36.6. Function Overloading
36.7. Function Volatility Categories
36.8. Procedural Language Functions
36.9. Internal Functions
36.10. C-Language Functions
36.11. Function Optimization Information
36.12. User-Defined Aggregates
36.13. User-Defined Types
36.14. User-Defined Operators
36.15. Operator Optimization Information
36.16. Interfacing Extensions to Indexes
36.17. Packaging Related Objects into an Extension
36.18. Extension Building Infrastructure
37. Triggers
37.1. Overview of Trigger Behavior
37.2. Visibility of Data Changes
37.3. Writing Trigger Functions in C
37.4. A Complete Trigger Example
38. Event Triggers
38.1. Overview of Event Trigger Behavior
38.2. Event Trigger Firing Matrix
38.3. Writing Event Trigger Functions in C
38.4. A Complete Event Trigger Example
38.5. A Table Rewrite Event Trigger Example
39. The Rule System
39.1. The Query Tree
39.2. Views and the Rule System
39.3. Materialized Views
39.4. Rules on INSERT, UPDATE, and DELETE
39.5. Rules and Privileges
39.6. Rules and Command Status
39.7. Rules Versus Triggers
40. Procedural Languages
40.1. Installing Procedural Languages
41. PL/pgSQL — SQL Procedural Language
41.1. Overview
41.2. Structure of PL/pgSQL
41.3. Declarations
41.4. Expressions
41.5. Basic Statements
41.6. Control Structures
41.7. Cursors
41.8. Transaction Management
41.9. Errors and Messages
41.10. Trigger Functions
41.11. PL/pgSQL under the Hood
41.12. Tips for Developing in PL/pgSQL
41.13. Porting from Oracle PL/SQL
42. PL/oraSQL — SQL Procedural Language
42.1. Overview
42.2. Structure of PL/oraSQL
42.3. Declarations
42.4. Expressions
42.5. Basic Statements
42.6. Control Structures
42.7. Cursors
42.8. Transaction Management
42.9. Packages
43. PL/Tcl — Tcl Procedural Language
43.1. Overview
43.2. PL/Tcl Functions and Arguments
43.3. Data Values in PL/Tcl
43.4. Global Data in PL/Tcl
43.5. Database Access from PL/Tcl
43.6. Trigger Functions in PL/Tcl
43.7. Event Trigger Functions in PL/Tcl
43.8. Error Handling in PL/Tcl
43.9. Explicit Subtransactions in PL/Tcl
43.10. Transaction Management
43.11. PL/Tcl Configuration
43.12. Tcl Procedure Names
44. PL/Perl — Perl Procedural Language
44.1. PL/Perl Functions and Arguments
44.2. Data Values in PL/Perl
44.3. Built-in Functions
44.4. Global Values in PL/Perl
44.5. Trusted and Untrusted PL/Perl
44.6. PL/Perl Triggers
44.7. PL/Perl Event Triggers
44.8. PL/Perl Under the Hood
45. PL/Python — Python Procedural Language
45.1. Python 2 vs. Python 3
45.2. PL/Python Functions
45.3. Data Values
45.4. Sharing Data
45.5. Anonymous Code Blocks
45.6. Trigger Functions
45.7. Database Access
45.8. Explicit Subtransactions
45.9. Transaction Management
45.10. Utility Functions
45.11. Environment Variables
46. Server Programming Interface
46.1. Interface Functions
46.2. Interface Support Functions
46.3. Memory Management
46.4. Transaction Management
46.5. Visibility of Data Changes
46.6. Examples
47. Background Worker Processes
48. Logical Decoding
48.1. Logical Decoding Examples
48.2. Logical Decoding Concepts
48.3. Streaming Replication Protocol Interface
48.4. Logical Decoding SQL Interface
48.5. System Catalogs Related to Logical Decoding
48.6. Logical Decoding Output Plugins
48.7. Logical Decoding Output Writers
48.8. Synchronous Replication Support for Logical Decoding
49. Replication Progress Tracking
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