mysql存储过程

/*OUT参数的简单的存储程序*/
DELIMITER //
CREATE PROCEDURE simpleproc(OUT parm1 INT)
BEGIN
SELECT COUNT(*) INTO parm1 FROM student;
END 
//
DELIMITER ;
/*调用存储程序*/
CALL simpleproc(@a);
SELECT @a;
/*采用参数的函数使用一个SQL函数执行一个操作，并返回结果*/
CREATE FUNCTION hello (s CHAR(20)) RETURNS CHAR(30)
RETURN CONCAT('hello ,',s,' !')
/*调用存储函数*/
SELECT hello('你好');
/*删除存储过程或者函数
DROP {PROCEDURE | FUNCTION} [IF EXISTS] sp_name
*/
/*
显示创建存储函数
*/
SHOW CREATE PROCEDURE test.simpleproc;
SHOW CREATE FUNCTION test.`hello`;
/*显示函数名为hello的模糊查询*/

SHOW FUNCTION STATUS LIKE 'hello';

//查看student表的数据
DELIMITER //
CREATE PROCEDURE p1()
BEGIN
SELECT * FROM student;
END //
CALL p1();
SELECT * FROM student;
//比较
DELIMITER //
CREATE PROCEDURE p2(a INT)
BEGIN
SELECT * FROM student WHERE age>a;
END //
CALL p2(22);


DELIMITER //
CREATE PROCEDURE p3(a INT,b CHAR(2))
BEGIN
IF b='h' THEN
SELECT * FROM student WHERE age>a;
ELSE
SELECT * FROM student WHERE age<a;
END IF;
END//


CALL p3(2,'d');
//计算前n项和
DELIMITER //
CREATE PROCEDURE p4(n SMALLINT)
BEGIN
DECLARE i INT;
DECLARE s INT;
SET i=1;
SET s=0;
WHILE i<=n DO
SET s=s+i;
SET i=i+1;
END WHILE;
SELECT s;
END//
CALL p4(100);