Book description
Structured Query Language (SQL) procedures, triggers, and functions, which are also known as user-defined functions (UDFs), are the key database features for developing robust and distributed applications. IBM® DB2® for i supported these features for many years, and they are enhanced in IBM i versions 6.1, 7.1, and 7.2. DB2 for i refers to the IBM DB2 family member and relational database management system that is integrated within the IBM Power operating system that is known as IBM i.
This IBM Redbooks® publication includes several of the announced features for SQL procedures, triggers, and functions in IBM i versions 6.1, 7.1, and 7.2. This book includes suggestions, guidelines, and practical examples to develop DB2 for i SQL procedures, triggers, and functions effectively.
This book covers the following topics:
Introduction to the SQL/Persistent Stored Modules (PSM)
language, which is used in SQL procedures, triggers, and
functions
SQL procedures
SQL triggers
SQL functions
This book is for IBM i database engineers and data-centric
developers who strive to provide flexible, extensible, agile, and
scalable database solutions that meet business requirements in a
timely manner.
Before you read this book, you need to know about relational database technology and the application development environment on the IBM Power Systems™ with the IBM i operating system.
Table of contents
- Front cover
- Notices
- IBM Redbooks promotions
- Preface
- Chapter 1. Introduction to data-centric programming
- Chapter 2. Introduction to SQL Persistent Stored Module
- Chapter 3. SQL fundamentals
- Chapter 4. Procedures
-
Chapter 5. Triggers
- 5.1 Trigger concepts
- 5.2 Trigger types
- 5.3 Introduction to triggers
- 5.4 Defining triggers
-
5.5 Trigger examples
- 5.5.1 Simple trigger examples
- 5.5.2 Use of correlation names for column values
- 5.5.3 Multiple event triggers
- 5.5.4 Changing row values in a BEFORE trigger
- 5.5.5 Calling a procedure from a trigger
- 5.5.6 Using transition tables
- 5.5.7 Signaling an error
- 5.5.8 Self-referencing triggers
- 5.5.9 DB2ROW versus DB2SQL triggers
- 5.5.10 INSTEAD OF triggers
-
5.6 Additional trigger considerations
- 5.6.1 Trigger limits
- 5.6.2 Qualifying references
- 5.6.3 Trigger program attributes
- 5.6.4 Adding columns to tables
- 5.6.5 Dropping or revoking privileges on tables
- 5.6.6 Renaming or moving a table
- 5.6.7 Transaction isolation
- 5.6.8 Datetime considerations
- 5.6.9 Triggers and traditional record-level access
- 5.6.10 Multiple triggers on the same table
- 5.7 Trigger-related catalogs
-
Chapter 6. Functions
- 6.1 Introduction
- 6.2 Nature of user-defined functions
- 6.3 Types of user-defined functions
- 6.4 Structure of an SQL UDF
- 6.5 CREATE FUNCTION syntax for SQL scalar and table functions
- 6.6 Resolving a UDF
- 6.7 System catalog tables and views
- 6.8 UDF examples
- 6.9 UDF inlining
- 6.10 UDTF examples
- 6.11 Pipelined table functions
- 6.12 Coding considerations: UDF preferred practices
- 6.13 SQL control statements
- 6.14 Handling errors in SQL UDFs
- Chapter 7. Development and deployment
- Chapter 8. Creating flexible and reusable procedures
-
Chapter 9. IBM i and IBM DB2 for i services
- 9.1 Health Center procedures
- 9.2 Utility procedures
- 9.3 Plan cache procedures
- 9.4 DB Application Services
- 9.5 Performance Services
- 9.6 PTF Services
- 9.7 Security Services
- 9.8 Message Handling Services
- 9.9 Librarian Services
- 9.10 Work Management Services
- 9.11 Java Services
- 9.12 IBM i Application Services
- Appendix A. Allocating, describing, and manipulating descriptors
- Appendix B. Additional material
- Related publications
- Back cover
Product information
- Title: SQL Procedures, Triggers, and Functions on IBM DB2 for i
- Author(s):
- Release date: April 2016
- Publisher(s): IBM Redbooks
- ISBN: 9780738441641
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