PostgreSQL

Table of Contents

43.1. Overview

43.1.1. Advantages of Using PL/pgSQL

43.1.2. Supported Argument and Result Data Types

43.2. Structure of PL/pgSQL

43.3. Declarations

43.3.1. Declaring Function Parameters

43.3.2. ALIAS

43.3.3. Copying Types

43.3.4. Row Types

43.3.5. Record Types

43.3.6. Collation of PL/pgSQL Variables

43.4. Expressions

43.5. Basic Statements

43.5.1. Assignment

43.5.2. Executing SQL Commands

43.5.3. Executing a Command with a Single-Row Result

43.5.4. Executing Dynamic Commands

43.5.5. Obtaining the Result Status

43.5.6. Doing Nothing At All

43.6. Control Structures

43.6.1. Returning from a Function

43.6.2. Returning from a Procedure

43.6.3. Calling a Procedure

43.6.4. Conditionals

43.6.5. Simple Loops

43.6.6. Looping through Query Results

43.6.7. Looping through Arrays

43.6.8. Trapping Errors

43.6.9. Obtaining Execution Location Information

43.7. Cursors

43.7.1. Declaring Cursor Variables

43.7.2. Opening Cursors

43.7.3. Using Cursors

43.7.4. Looping through a Cursor’s Result

43.8. Transaction Management

43.9. Errors and Messages

43.9.1. Reporting Errors and Messages

43.9.2. Checking Assertions

43.10. Trigger Functions

43.10.1. Triggers on Data Changes

43.10.2. Triggers on Events

43.11. PL/pgSQL under the Hood

43.11.1. Variable Substitution

43.11.2. Plan Caching

43.12. Tips for Developing in PL/pgSQL

43.12.1. Handling of Quotation Marks

43.12.2. Additional Compile-Time and Run-Time Checks

43.13. Porting from Oracle PL/SQL

43.13.1. Porting Examples

43.13.2. Other Things to Watch For

43.13.3. Appendix

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