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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1-5. Accepting User Input from the Keyboard
Problem
You want to write a script that prompts the user for some input. You want your PL/SQL code to then use that input to generate some results.
Solution
SQL*Plus provides a facility to accept user input. Use ampersand (&) character to indicate that a particular value should be entered from the keyboard. Here's an example:
DECLARE
emp_count NUMBER;
BEGIN
SELECT count(*)
INTO emp_count
FROM employees
WHERE department_id = &department_id;
END;
If the previous block is executed from SQL*Plus, you will see the following text, which prompts you to enter a department ID. In this case, the department ID of 40 is used.
Enter value for department_id: 40 old 7: WHERE department_id = &department_id; ...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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