Application Programming and SQL Guide - Kmlinux

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Summary of changes to this book
The principal changes to this book are:
v Chapter 1, “Retrieving data,” on page 3 explains how to create and use common
table expressions in SELECT, CREATE VIEW, and INSERT statements, and also
describes how to use common table expressions to create recursive SQL.
v Chapter 2, “Working with tables and modifying data,” on page 19 explains how to
select column values as you insert rows into a table by using the SELECT from
INSERT statement.
v Chapter 6, “Basics of coding SQL in an application program,” on page 73
contains information on how to use:
– Host variable arrays, and their indicator arrays, in a multiple-row INSERT
statement (in a C or C++, COBOL, or PL/I program).
– The GET DIAGNOSTICS statement to return diagnostic information about the
last SQL statement that was executed (for example, information about input
data errors during the execution of a multiple-row INSERT statement).
v Chapter 7, “Using a cursor to retrieve a set of rows,” on page 99 explains how to
use:
– Static and dynamic scrollable cursors.
– A rowset-positioned cursor in a multiple-row FETCH statement (in a C or C++,
COBOL, or PL/I program).
– Positioned updates and deletes with a rowset-positioned cursor.
v Chapter 9, “Embedding SQL statements in host languages,” on page 135
contains information on how to declare host variable arrays (for C or C++,
COBOL, and PL/I) for use with multiple-row INSERT and FETCH statements.
v Chapter 10, “Using constraints to maintain data integrity,” on page 251 describes
informational referential constraints (not enforced by DB2), describes referential
constraints on tables with multi-level security with row-level granularity, and
explains how to maintain referential integrity when using data encryption.
v Chapter 11, “Using DB2-generated values as keys,” on page 261 is a new
chapter that describes the use of ROWID columns for direct row access, identity
columns as parent keys and foreign keys, and values generated from sequence
objects as keys across multiple tables.
v Chapter 12, “Using triggers for active data,” on page 269 describes interactions
between triggers and tables that use multi-level security with row-level
granularity.
v Chapter 21, “Preparing an application program to run,” on page 461 describes
the new SQL processing options:
– CCSID, which specifies the CCSID in which the source program is written.
– NEWFUN, which indicates whether to accept the syntax for DB2 Version 8
new functions.
– For C programs, PADNSTR or NOPADNSTR, which indicates whether or not
output host variables that are NUL-terminated strings are padded with blanks.
This chapter also describes how the CURRENT PACKAGE PATH special register
is used in identifying the collection for packages at run time.
v Chapter 24, “Coding dynamic SQL in application programs,” on page 543
describes how to use a descriptor when you prepare and execute a multiple-row
INSERT statement. This chapter also includes information about how bind option
REOPT(ONCE) affects dynamic SQL statements.
© Copyright IBM Corp. 1983, 2004 xxiii