mysql存储过程的写法

-- ----------------------------

-- Procedure structure for `proc_adder`

-- ----------------------------DROP PROCEDURE IF EXISTS `proc_adder`;

DELIMITER ;;CREATE DEFINER=`root`@`localhost` PROCEDURE `proc_adder`(IN a int, IN b int, OUT sum int)BEGIN

    #Routine body goes here...

    DECLARE c int;

    if a is null then set a = 0;

    end if;

    if b is null then set b = 0;

    end if;set sum  = a + b;END

;;

DELIMITER ;

set @b=5;

call proc_adder(2,@b,@s);

select @s as sum;