DB16 - DB2 Stored Procedures & Functions Workshop - 2 - 3 Days

Virtual or On-site course enquiry (from £165 pp per day)

Course Description

2 days (using 1 external programming language) or 3 days (using 1 programming language plus SQL-PL).

This course provides the applications programmer with an in-depth knowledge of the construction and installation of DB2 Stored Procedures and User Defined Functions. During the course, Stored Procedures and UDFs will be written using a choice of programming language. If necessary the course can cover the automated generation of Stored Procedures using IBM Data Studio. The course can also optionally include tuition of the SQL Procedural Language (SQL-PL).

Pre-requisites

The delegate should be familiar with the host environment, together with a working knowledge of DB2 program development in COBOL, PL1 or Java.

Objectives

The aim of this course is to provide the programmer, already familiar with DB2, with the necessary skills required to generate (if required), code, install and test DB2 Stored Procedures, User Defined Functions and Triggers. An optional objective is to be able to write procedures in SQL-PL.

On completion of this course the student will be able to:

define and code Stored Procedures using COBOL, PL1 or Java
execute Stored Procedures
code Stored Procedures using SQL-PL (optional)
return Dynamic Result Sets from Stored Procedures
understand Schemas and Schema Paths
use the ARRAY datatype within procedures
use Global Temporary tables within Stored Procedures
use Declared Temporary tables within Stored Procedures
use SPUFI / IBM Data Studio to develop Stored Procedures
call Stored Procedures from Triggers

Environment

Development will be performed using DB2 running on LUW or z/OS. Stored Procedures can be written in a choice of the following languages:

COBOL
PL1
Java
SQL-PL

Customisation

For on-site courses (i.e. at your premises), we are more than happy to tailor the course agenda to suit your exact requirements. In many cases, we are able to build your in-house standards and naming conventions into the delivered course.

Course Details

INTRODUCTION TO STORED PROCEDURES: Overview; Reduction in Network Traffic; Stored Procedure Advantages; DB2 Address Spaces; Defining a Stored Procedure; Error Handling within Stored Procedures; DB2 for z/OS Stored Procedure Enhancements; External vs Native SQL Procedures
STORED PROCEDURE DEFINITION: The Create Procedure Statement; The Create Procedure - Catalog Information; Stored Procedure Definition Parameters - General; Further Definition Parameters for External Procedures; Further Definition Parameters for Native Procedures; Allowable SQL Statements; The Alter Procedure Statement; Deleting a Stored Procedure Definition; Defining a Java Stored Procedure; Native (Internal) SQL Procedures; How Native SQL Procedures Work; Setting the SQL Terminator; Creating Native and External SQL Procedures; Altering Native SQL Procedures - Versioning; Creating the Original Version; Adding a New Version; Version Manipulation; Stored Procedure Security; The Stored Procedure Owner; Stored Procedure Authorisation; Authorisation for Dynamic Statements
CALLING STORED PROCEDURES: The Call Statement; Passing Parameters; Calling A Stored Procedure From COBOL; Calling a Stored Procedure from REXX; Calling A Stored Procedure From Java; Java - Setting Input / Inout Parameters; Java - Registering Output / Inout Parameters; Java - Getting Output / Inout Parameters; Java - Parameter / Data Type Mappings; Java - Handling Nulls; Java - Handling SQL Errors; Java - Handling SQL Warnings; Calling Program - Package Requirements; Common SQL Codes Returned from the Call
SCHEMAS AND PATHS: Schemas; The Grant Schema Statement; Schema Path – Bind Option; Current Path - Special Register; Overriding the Search Path; Set Current Schema; Set Current Schema Behaviour; Set Current Package Path; Set Current Package Path Behaviour
WRITING STORED PROCEDURES IN COBOL, PL1, C OR JAVA: Cobol Stored Procedure Language Requirements; Stored Procedure Restrictions; Using Commit and Rollback; Using Re-Entrant Code; Main Program or Sub-Program?; Preparing a Cobol, PL1 or C Stored Procedure; Package Requirements; Receiving Parameters into a Stored Procedure; Using Dbinfo with Parameter Style Db2sql; Coding a Stored Procedure in Cobol; Error Handling; Error Handling Using Mode DB2SQL - Setting Sqlstate; Error Handling Using Mode DB2SQL - Cobol Example
PROCEDURE EXECUTION: WLM Address Spaces; Setting Up The WLM Environment; WLM Features; The Display Procedure Command; Starting and Stopping Procedures; WLM Operational Commands; Using Explain for Function Resolution; z/OS Procedures - Dynamic Writing to Datasets
PASSING DYNAMIC RESULTS SETS, TEMPORARY TABLES AND ARRAYS: Dynamic Results Sets; Objects From Which You Can Return Result Sets; Requirements for Dynamic Result Sets; Cursor Processing Within the Stored Procedure; Dynamic Result Set Embedded SQL Statements; Query Results Sets Example; Declare Cursor With Return; Return to Caller or Client?; Definition of Result-Set-Locator Variables; Associate Locators; The Allocate Cursor Statement; Java - Handling Dynamic Result Sets; Java - Testing For Optional Result Sets; Rexx - Handling Dynamic Result Sets; Using Created Global Temporary Tables; Using Declared Temporary Tables; Declared Temporary Table - Commit Behaviour; Declared Temporary Table Considerations; Declared Temporary Tables – Comparisons; Example - Using Declared Tables in a Stored Procedure; Example - Passing Temporary Data to a Stored Procedure; Passing Arrays; Ordinary Arrays; Associative Arrays; The Array_Agg Function; Other Array Functions; Passing Arrays - Examples
IBM DATA STUDIO: Overview; Building DB2 Stored Procedures and Functions; Creating a New Workspace, Connection and Project; Creating a Stored Procedure; Deploying and Executing the Stored Procedures; Debugging Stored Procedures
USER DEFINED FUNCTIONS: User-Defined Functions; Built-in Functions; Creating External Functions; The Create Function Statement; Function Parameters; Function Parameters Summary; Sourced Function Examples; External Scalar Function Examples; Creating External Table Functions; External Table Function Example; Implementing an External Function; Step 1 - Write The Function; Function Example - Cobol; Function Example using Scratchpad - Cobol; Function Example - C; Function Example - PL/1; Step 2 - Preparing a User-Defined Function for Execution; Step 3 - Define The Function To DB2; Step 4 - Test the Function; Function Authorisation; Function Execution Environment; Dropping a Function; Using Explain for Function Resolution; The Stop Function Command; The Start Function Command; The Display Function Command
TRIGGERS: The Create Trigger Statement; Before and After Triggers; Trigger Examples; Invoking Stored Procedures and User-Defined Functions
CODING PROCEDURES IN SQL (OPTIONAL): The SQL Procedures language; An SQL Procedure Example; Building External SQL Procedures?; Building External SQL/PL Procedures - JCL Example; SQL Procedure Supported Statements; DML Statement Review; Selecting Data; Selecting Data - Singleton Selects; Implicit Casting; Selecting Data - Cursor Operations; The Update Statement; The Delete Statement; The Insert Statement; The Mass Insert Statement; The Merge Statement; Special Operators; Scalar Functions
SQL/PL REFERENCE (OPTIONAL): Begin and End Statements (Compound Statements); Declaring Host Variables; Host Variable Data Types; Native Stored Procedures - Nested Compound Statements; Using Labels; SQL Procedure Example – Nested Compound Statement; Scoping Rules; SQL-PL Statements; Assigning Values to Variables - The SET Statement; CASE Statement; Comments; FOR Statement; GET DIAGNOSTICS Statement; GOTO Statement; IF Statement; Comparison Operators; LEAVE and ITERATE Statements; LOOP statement; REPEAT Statement; RETURN Statement; WHILE statement; Dynamic SQL Statements; Protection from SQL Injection; Returning Result Sets; Processing Result Sets From Other Stored Procedures; Handling Errors in an SQL Stored Procedure; Common SQLCODE and SQLSTATE Values; Testing for Errors - SQLCode and SQLState; The Declare Handler Statement; Declaring Conditions for Handlers; Condition Handler Execution Path; Error Handling - SIGNAL Statement; RESIGNAL Statement; Sql Pl - Special Registers; Debugging Native Stored Procedures

Course Format

The course contains many practical exercises to ensure familiarity with the product. On completion of this course students will be able to develop Stored Procedures in either COBOL, PL1, Java or SQL and optionally be able to generate Stored Procedures using SPB or WSAD.

The comprehensive Student Guide supplied is fully indexed serving as a useful reference tool long after the course has finished. Delegates will also be able to access a free help-line with technical questions relating to topics covered on the course.

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