December 2010
Intermediate to advanced
451 pages
11h 16m
English
Content preview from Oracle and PL/SQL Recipes: A Problem-Solution Approach
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10-13. Navigating Collections
Problem
You need a routine to display sales totaled by region, which is stored in a collection of numbers, but the collection is indexed by a character string. Using a LOOP from 1 to the maximum size will not work.
Solution
Use the FIRST and LAST method to traverse the collection allowing PL/SQL to supply the proper index values. In this example, sales amounts are stored in a TABLE indexed by a string.
DECLARE
TYPE ntype IS TABLE OF NUMBER INDEX BY VARCHAR2(5);
nlist ntype;
idx VARCHAR2(5);
total integer := 0;
BEGIN
nlist('North') := 100;
nlist('South') := 125;
nlist('East') := 75;
nlist('West') := 75;
idx := nlist.FIRST;
LOOP
EXIT WHEN idx is null; DBMS_OUTPUT.PUT_LINE ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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