Book description
Procedures, triggers, and user-defined functions (UDFs) are the key database software features for developing robust and distributed applications. IBM Universal Database™ for i (IBM DB2® for i) supported these features for many years, and they were enhanced in V5R1, V5R2, and V5R3 of IBM® OS/400® and V5R4 of IBM i5/OS™.
This IBM Redbooks® publication includes several of the
announced features for procedures, triggers, and UDFs in V5R1,
V5R2, V5R3, and V5R4. This book includes suggestions, guidelines,
and practical examples to help you effectively develop IBM DB2 for
i procedures, triggers, and UDFs. The following topics are covered
in this book:
External stored procedures and triggers
Java procedures (both Java Database Connectivity (JDBC) and
Structured Query Language for Java (SQLJ))
External triggers
External UDFs
This publication also offers examples that were developed in
several programming languages, including RPG, COBOL, C, Java, and
Visual Basic, by using native and SQL data access interfaces.
This book is part of the original IBM Redbooks publication, Stored Procedures, Triggers, and User-Defined Functions on DB2 Universal Database for iSeries, SG24-6503-02, that covered external procedures, triggers, and functions, and also SQL procedures, triggers, and functions. All of the information that relates to external routines was left in this publication. All of the information that relates to SQL routines was rewritten and updated. This information is in the new IBM Redbooks publication, SQL Procedures, Triggers, and Functions on IBM DB2 for i, SG24-8326.
This book is intended for anyone who wants to develop IBM DB2 for i procedures, triggers, and UDFs. Before you read this book, you need to know about relational database technology and the application development environment on the IBM i server.
Table of contents
- Front cover
- Notices
- Preface
- Summary of changes
- IBM Redbooks promotions
- Chapter 1. Introducing IBM DB2 for i
- Chapter 2. Stored procedures, triggers, and user-defined functions for an Order Entry application
- Chapter 3. Stored procedures
-
Chapter 4. External stored procedures
- 4.1 Registering external stored procedures
- 4.2 Parameter styles in external stored procedures
- 4.3 Coding external stored procedures
- 4.4 Returning result sets from external procedures
- 4.5 CLI client program that calls a procedure that returns multiple result sets
- 4.6 Moving into production (save and restore)
- 4.7 The Order Entry application: Stored procedure examples
- 4.8 External stored procedure that uses a service program
- 4.9 RPG IV example for an external stored procedure
-
Chapter 5. Java stored procedures
- 5.1 Prerequisites
- 5.2 Coding DB2 for i Java stored procedures
- 5.3 Coding examples
- 5.4 Registering Java stored procedures
- 5.5 Calling Java stored procedures
- 5.6 Using SQL NULL
- 5.7 SQLJ procedures to manipulate JAR files
- 5.8 Additional considerations
- 5.9 GetSuppliers example: Implementation with no result sets
- 5.10 GetSupplierRS example: Implementation with result sets
- 5.11 Problem determination
-
Chapter 6. Stored procedure error handling
- 6.1 Database error reporting strategy
-
6.2 Error handling in SQL stored procedures
- 6.2.1 Condition and handler declaration
- 6.2.2 SIGNAL and RESIGNAL
- 6.2.3 SQLCODE and SQLSTATE variables in the SQL procedure
- 6.2.4 Returning values by using the RETURN statement
- 6.2.5 GET DIAGNOSTICS
- 6.2.6 Error handling in nested compound statements
- 6.2.7 Use nested compound statements for better performance
- 6.3 Error handling in external stored procedures
- 6.4 Error handling in Java stored procedures
- 6.5 Retrieving user-defined errors in a client application
- 6.6 Transaction management in stored procedures
- 6.7 External stored procedures and commitment control
- 6.8 Several practical examples
- Chapter 7. Database triggers
- Chapter 8. External triggers
-
Chapter 9. Triggers, referential integrity, and constraints
- 9.1 Transaction isolation and recovery
- 9.2 Trigger journal entries
- 9.3 Triggers and referential integrity
- 9.4 Comparing referential integrity and triggers
- 9.5 Constraints and triggers: Ordering the actions
- 9.6 Triggers, referential integrity, and commitment control
- 9.7 Referential integrity, triggers, and journal entries
- Chapter 10. User-defined functions
-
Chapter 11. External user-defined functions
- 11.1 User-defined function considerations
- 11.2 Registering an external UDF
- 11.3 Parameter styles in external UDFs
- 11.4 Scratchpad in UDFs and UDTFs
- 11.5 UDF and UDTF calling sequence
- 11.6 Coding an external UDF
- 11.7 Error handling in external UDFs
- 11.8 Pointer arithmetic and the scratchpad
- 11.9 Coding example for an external user-defined table function
- Appendix A. Sample ILE C program that uses the QDBRTVFD API
-
Appendix B. Order Entry application: Detailed flow
- Program flow for the Insert Order Header program
- Program description for the Insert Order Header program
- Program flow for the Insert Order Detail program
- Program description for the Insert Order Detail program
- Program flow for the Finalize Order program
- Program description for the Finalize Order program
- Appendix C. Additional material
- Related publications
- Back cover
Product information
- Title: External Procedures, Triggers, and User-Defined Functions on IBM DB2 for i
- Author(s):
- Release date: April 2016
- Publisher(s): IBM Redbooks
- ISBN: 9780738441597
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