DB2 for OS/390 and z/OS, SQL and Application Programming
Overview

First, the concepts of DB2 are presented and discussed.

The Structured Query Language (SQL) is presented as the means to access DB2 data (and to create and secure DB2 components). Several guided, hands-on, practice sessions give each attendee an opportunity to use SQL to access data. QMF and/or SPUFI are used to execute SQL statements. Referential Integrity concepts and implementation are covered.

DB2 (SQL) programming / embedding SQL in a COBOL application program is presented and discussed in detail. A "shell" program is modified to SELECT a single row, FETCH multiple rows, INSERT, UPDATE, and DELETE row(s), use Referential Integrity, and use column functions and grouping.

DB2 performance guidelines are discussed. The SQL statement EXPLAIN PLAN is used to help to evaluate the efficiency of SQL statements.

The following "Release Dependent" features are also covered -

  • Version 6 - 100 new scalar functions, update Triggers, User Defined Functions (UDF), User Defined Types (UDT)
  • Version 7 - UNION Everywhere, Scrollable cursors, Limited Fetch
  • Version 8 - additional SQL features
Also, a demonstration is provide of DB2 for WINDOWs to show "future" features for DB2 for OS/390. These features include Recursive SQL, the WITH SQL feature, GROUPING SETS, ROLLUP and Visual Explain.

LEARNING OBJECTIVES

As a result of this class, the attendee will be able to

  • Explain DB2 concepts, terminology and components
  • Discuss the Primary Key (PK), Unique Key (UK) and Foreign Key (FK) concept
  • SELECT rows of data from DB2 tables
  • Use QMF and/or SPUFI to "run" SQL statements
  • Use the WHERE clause to SELECT specific rows of a DB2 table
  • Build queries using the ORDER BY, GROUP BY, HAVING clauses
  • Use the CASE expressions and several SCALAR / COLUMN FUNCTIONS
  • Access multiple tables
  • JOIN, UNION, sub-queries, nested table expressions
  • CREATE Tables, Indexes, Views
  • "Change" tables using the INSERT, UPDATE, DELETE statements
  • Describe the security provided by the GRANT and REVOKE
  • Discuss the design considerations of REFERENTIAL INTEGRITY
  • Perform DCLGENs to build table definitions and I/O areas
  • Modify a "shell" program to select a single row, multiple rows, and change rows
  • Discuss the importance of the SQLCODE and how to test for it
  • Discuss overall DB2 PERFORMANCE considerations
  • Run the EXPLAIN PLAN SQL statement and analyze results
Audience

Experienced Data Processing personnel who need use SQL to design and develop programs to access DB2 data.

Prerequisites

At least six months of TSO/ISPF and COBOL programming experience is recommended. No previous database experience is needed.

Course duration

5 days

Course outline

DAY 1
 
  1. Introduction to DB2


      2. Course Introduction
    1. DB2 - Concepts, and Terminology

  2. Structured Query Language (SQL)


    1. SQL 1 - The SELECT Statement
    2. Database 2 Interactive
    3. SQL 2 - SQL Functions
    4. SQL 3 - ORDER BY, GROUP BY, HAVING
DAY 2
 
  1. Structured Query Language (SQL)(Continued)


    1. SQL 4 - Join, Sub-select, UNION
    2. SQL 5 - Data Definition Language
    3. SQL 6 - INSERT, UPDATE, DELETE
    4. SQL 8 - Other SQL Topics
DAY 3
 
  1. DB2 Application Programming


    1. SQL Programming I - Overview
    2. SQL Programming II - Data and Procedure Division Changes
    3. SQL Programming III - SELECTing Multiple Rows

DAY 4
 
  1. DB2 Application Programming (Continued)


    1. Concurrency Control - Locking
    2. SQL Programming IV - INSERT, UPDATE, DELETE
DAY 5
 
  1. DB2 Application Programming (Continued)
  2. Additional Topics


    1. SQL Programming V - Other Programming Considerations
    2. DB2 Performance Introduction
    3. Data Control Language (DCL)
Appendices

Appendix A - IBM Sample Tables Appendix J - Version 6 Functions Summary
Appendix B - Bibliography Appendix K - UDT / UDF
Appendix C - The Programming Workshop Appendix L - Cast Testing
Appendix D - EXPLAIN PLAN Statement and PLAN_TABLE and DSN_STATEMNT_TABLE Appendix M - Trigger Introduction
Appendix E - Hints to Success Appendix N - DB2 for WINDOWs Overview
Appendix F - SQLCODES / SQLSTATES Appendix Z6- Changes Summary - DB2 V 6
Appendix G - QMF Overview Appendix Z7- Changes Summary - DB2 V 7
Appendix H - Stored Procedures Appendix Z8- Changes Summary - DB2 V 8
Appendix I - "Common" SQL Errors  


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