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IBM DB2 9.7 Advanced Application Developer Cookbook

Book Image

IBM DB2 9.7 Advanced Application Developer Cookbook

Overview of this book

With lots of new features, DB2 9.7 delivers one the best relational database systems in the market. DB2 pureXML optimizes Web 2.0 and SOA applications. DB2 LUW database software offers industry leading performance, scale, and reliability on your choice of platform on various Linux distributions, leading Unix Systems like AIX, HP-UX and Solaris and MS Windows platforms. This DB2 9.7 Advanced Application Developer Cookbook will provide an in-depth quick reference during any application's design and development. This practical cookbook focuses on advanced application development areas that include performance tips and the most useful DB2 features that help in designing high quality applications. This book dives deep into tips and tricks for optimized application performance. With this book you will learn how to use various DB2 features in database applications in an interactive way.

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IBM DB2 9.7 Advanced Application Developer Cookbook
Mar, 2012 | 442 pages
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Table of Contents (15 chapters)
IBM DB2 9.7 Advanced Application Developer Cookbook
IBM DB2 9.7 Advanced Application Developer Cookbook
Credits
Credits
About the Authors
About the Authors
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Application Development Enhancements in DB2 9.7
Application Development Enhancements in DB2 9.7
Introduction
Changing column names online using the ALTER TABLE operation
Using the CREATE OR REPLACE clause while creating objects
Using the ALTER TABLE operation in a single transaction
Using the CREATE WITH ERROR support
Using the soft invalidation and automatic revalidation support
Using the ALTER COLUMN SET DATA TYPE extended support
Using the new TRUNCATE statement
Using AUTONOMOUS transactions
Using implicit casting during application enablement
Using the DEFAULT values and NAMED arguments in procedures
2
DB2 Application Techniques
DB2 Application Techniques
Introduction
Granting and revoking instance-level authorities
Granting and revoking database-level authorities
Granting and revoking object privileges
Implementing static SQL in DB2
Implementing dynamic SQL in DB2
Creating Declared Global Temporary Tables (DGTTs)
Using XML in a declared temporary table
Improving performance by creating indexes on a DGTT
Creating Created Global Temporary Tables (CGTT)
Using generated columns in tables
Creating a savepoint
Rolling back to a savepoint
Using savepoints in JDBC
Using savepoints in SQLJ
Creating a sequence object
Modifying a sequence object
Referencing a sequence object
3
General Application Design
General Application Design
Introduction
Improving concurrency by using a connection concentrator
Using trusted contexts for improved security
Using trusted connections in JDBC
Using trusted connections in PHP
Securing data by using DB2 encryption
Improving concurrency by using enhanced optimistic locking
Working with user-defined types (UDT)
Working with structured types
4
Procedures, Functions, Triggers, and Modules
Procedures, Functions, Triggers, and Modules
Introduction
Creating a simple stored procedure
Using dynamic SQL in stored procedures
Working with result sets in stored procedures
Using ARRAY objects in stored procedures
Handling errors in stored procedures
Designing external stored procedures
Using PL/SQL exception handling in a procedure
Working with the message buffer in stored procedures
Planning and designing triggers
Using scalar user-defined functions
Writing external user-defined functions
Designing external table functions
Working with modules in DB2
5
Designing Java Applications
Designing Java Applications
Introduction
Creating connection objects in JDBC applications
Creating connection objects in SQLJ applications
Manipulating XML Data in Java applications
Batch processing in JDBC applications
Batch processing in SQLJ applications
Working with scrollable result sets
Handling errors and warnings in JDBC applications
Developing Java applications for high availability
Using SSL in Java applications
6
DB2 9.7 Application Enablement
DB2 9.7 Application Enablement
Introduction
First step towards enabling Oracle application to DB2 9.7
Using ROWNUM and DUAL in DB2 9.7
Using CUR_COMMIT concurrency control isolation level
Implementing hierarchical queries for recursion support
Using PL/SQL ANONYMOUS block statements
Handling RAISE_APPLICATION_ERROR in DB2 PL/SQL
Migrating Oracle database objects on to DB2 9.7
Porting multi-action triggers from Oracle to DB2 9.7
7
Advanced DB2 Application Features and Practices
Advanced DB2 Application Features and Practices
Introduction
Working with OLAP functions
Using optimizer profiles
Using explain utilities
Using section explain information
Interpreting db2exfmt output
Application development in partitioned databases
8
Preparing and Monitoring Database Applications
Preparing and Monitoring Database Applications
Introduction
Preparing applications for execution
Rebinding existing packages
Customizing application behavior using registry variables
Monitoring application performance
9
Advanced Performance Tuning Tips
Advanced Performance Tuning Tips
Introduction
Understanding predicates in SQL statements
Improving INSERT performance
Writing effective SQL statements

Using trusted connections in JDBC

In the previous recipe, we saw why trusted contexts are needed and we also saw how to create a trusted context. Once a trusted context is created, it can be used in various languages to create trusted connections. The infrastructure to create trusted connections is provided by the database drivers for that language. DB2 provides the following drivers that support trusted connections (as of DB2 9.7 GA):

  • IBM DB2 Driver for JDBC and SQLJ (Type-4 and Type-2 connectivity)

  • IBM_DB Driver for Ruby

  • IBM Data Server Provider for .NET

  • ibm_db2 Driver for PHP

  • CLI/ODBC

In this recipe, we will see how we can establish trusted connections in Java and switch user IDs within a connection. In this recipe, we will use the IBM DB2 driver for JDBC and SQLJ to connect to the database.

Getting ready

The following are the prerequisites for this recipe:

  1. 1. Java should be set up and the IBM DB2 driver for JDBC and SQLJ should be available (this driver is shipped with DB2, by default).

  2. 2....

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