DB2-小案例

--查看数据库的schema
select * from sysibm.sysschemata

--查看所有的数据库的procedure
SELECT * FROM syscat.procedures

--创建存储过程
CREATE PROCEDURE dept_median(IN deptNumber SMALLINT, OUT medianSalary double)
LANGUAGE SQL 
BEGIN 
	DECLARE v_numRecords INTEGER DEFAULT 1;
	DECLARE v_counter INTEGER 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;
	SET medianSalary = 0;
	SELECT count(*) INTO v_numRecords
		FROM STAFF 
		WHERE DEPT = deptNumber;
	OPEN c1;
	WHILE v_counter < (v_numRecords / 2 + 1 ) DO
		FETCH c1 INTO medianSalary;
		SET v_counter = v_counter +1;
	END WHILE;
	CLOSE c1;
END 


--是正确的语句，执行报错，改成命令行，能够正确执行
CALL dept_median(20,?)