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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3-7. Iterating Until a Condition Evaluates to FALSE
Problem
You want to iterate over a series of statements until a specified condition no longer evaluates to TRUE.
Solution
Use a WHILE statement to test the condition, and execute the series of statements if the condition evaluates to TRUE; otherwise, skip the statements completely. The following example shows a WHILE statement evaluating the current value of a variable and looping through until the value of the variable reaches ten. Within the loop, this variable is being multiplied by two and printing out its current value.
DECLARE
myValue NUMBER := 1;
BEGIN
WHILE myValue < 10 LOOP
DBMS_OUTPUT.PUT_LINE('The current value is: ' || myValue);
myValue := myValue * 2; END LOOP; ...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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