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Updating row selected by cursor

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When you sign in to comment, IBM will provide your email, first name and last name to DISQUS.That information, along with your comments, will be governed by DISQUS’ privacy policy.DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=1; OPEN cursor1; cursor_loop: LOOP FETCH cursor1 INTO var1, var2, var3; IF done=1 THEN LEAVE cursor_loop; END IF; -- Do something with the row fetched.

As promised in the My SQL Cursors and Loops article, this article explores the use of cursors and their role in stored procedure programming.

SQL DECLARE 2 CURSOR employee_cur IS 3 SELECT * FROM employee 4 FOR UPDATE OF salary; 5 BEGIN 6 FOR employee_rec IN employee_cur 7 LOOP 8 UPDATE employee 9 SET salary = 10000 10 WHERE CURRENT OF employee_cur; 11 END LOOP; 12 END; 13 / PL/SQL procedure successfully completed.

SQL SELECT * FROM employee; ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION ---- ---------- ---------- --------- --------- ---------- ---------- --------------- 01 Jason Martin 25-JUL-96 25-JUL-06 10000 Toronto Programmer 02 Alison Mathews 21-MAR-76 21-FEB-86 10000 Vancouver Tester 03 James Smith 12-DEC-78 15-MAR-90 10000 Vancouver Tester 04 Celia Rice 24-OCT-82 21-APR-99 10000 Vancouver Manager 05 Robert Black 15-JAN-84 08-AUG-98 10000 Vancouver Tester 06 Linda Green 30-JUL-87 04-JAN-96 10000 New York Tester 07 David Larry 31-DEC-90 12-FEB-98 10000 New York Manager 08 James Cat 17-SEP-96 15-APR-02 10000 Vancouver Tester 8 rows selected.

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What I love about writing SQL Tuning articles is that I very rarely end up publishing the findings I set out to achieve. We have a table containing years worth of data, most of which is static; we are updating selected rows that were recently inserted and are still volatile. For the purposes of the test, we will assume that the target table of the update is arbitrarily large, and we want to avoid things like full-scans and index rebuilds.