----------------------------------------------------------------------------- -- (c) Copyright IBM Corp. 2007 All rights reserved. -- -- The following sample of source code ("Sample") is owned by International -- Business Machines Corporation or one of its subsidiaries ("IBM") and is -- copyrighted and licensed, not sold. You may use, copy, modify, and -- distribute the Sample in any form without payment to IBM, for the purpose of -- assisting you in the development of your applications. -- -- The Sample code is provided to you on an "AS IS" basis, without warranty of -- any kind. IBM HEREBY EXPRESSLY DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR -- IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF -- MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Some jurisdictions do -- not allow for the exclusion or limitation of implied warranties, so the above -- limitations or exclusions may not apply to you. IBM shall not be liable for -- any damages you suffer as a result of using, copying, modifying or -- distributing the Sample, even if IBM has been advised of the possibility of -- such damages. ----------------------------------------------------------------------------- -- -- SOURCE FILE NAME: whiles.db2 -- -- SAMPLE: To create the DEPT_MEDIAN SQL procedure -- -- To create the SQL procedure: -- 1. Connect to the database -- 2. Enter the command "db2 -td@ -vf whiles.db2" -- -- To call the SQL procedure from the command line: -- 1. Connect to the database -- 2. Enter the following command: -- db2 "CALL dept_median (51, ?)" -- -- You can also call this SQL procedure by compiling and running the -- C embedded SQL client application, "whiles", using the whiles.sqc -- source file available in the sqlpl samples directory. ----------------------------------------------------------------------------- -- -- For more information on the sample scripts, see the README file. -- -- For information on creating SQL procedures, see the Developing SQL and External Routines book. -- -- For information on using SQL statements, see the SQL Reference. -- -- For the latest information on programming, building, and running DB2 -- applications, visit the DB2 Information Center: -- http://publib.boulder.ibm.com/infocenter/db2luw/v9r7/index.jsp ----------------------------------------------------------------------------- CREATE PROCEDURE dept_median (IN deptNumber SMALLINT, OUT medianSalary DOUBLE) LANGUAGE SQL BEGIN DECLARE SQLCODE INTEGER; DECLARE SQLSTATE CHAR(5); DECLARE v_numRecords INT DEFAULT 1; DECLARE v_counter INT DEFAULT 0; DECLARE v_mod INT DEFAULT 0; DECLARE v_salary1 DOUBLE DEFAULT 0; DECLARE v_salary2 DOUBLE DEFAULT 0; DECLARE c1 CURSOR FOR SELECT CAST(salary AS DOUBLE) FROM staff WHERE DEPT = deptNumber ORDER BY salary; DECLARE EXIT HANDLER FOR NOT FOUND SET medianSalary = 6666; -- initialize OUT parameter SET medianSalary = 0; SELECT COUNT(*) INTO v_numRecords FROM staff WHERE DEPT = deptNumber; OPEN c1; SET v_mod = MOD(v_numRecords, 2); CASE v_mod WHEN 0 THEN WHILE v_counter < (v_numRecords / 2 + 1) DO SET v_salary1 = v_salary2; FETCH c1 INTO v_salary2; SET v_counter = v_counter + 1; END WHILE; SET medianSalary = (v_salary1 + v_salary2)/2; WHEN 1 THEN WHILE v_counter < (v_numRecords / 2 + 1) DO FETCH c1 INTO medianSalary; SET v_counter = v_counter + 1; END WHILE; END CASE; END @