mysql 存储过程小问题

mysql写的存储过程的一些小问题

DELIMITER $$

USE `yzhoteldb`$$

DROP PROCEDURE IF EXISTS `yz_waveData`$$

CREATE DEFINER=`cacdba`@`%` PROCEDURE `yz_waveData`(
IN devCode VARCHAR(32), 
IN WhereCondition  VARCHAR(100)
)
BEGIN
DECLARE ftime VARCHAR(32);
DECLARE fvalue FLOAT;
-- 参与计算的变量需要写一个默值，否则值一直会变成null
DECLARE sumValue FLOAT DEFAULT 0;
DECLARE avgvalue FLOAT;
DECLARE sqlstr VARCHAR(32767);
DECLARE i INT DEFAULT 0;
DECLARE	done INTEGER DEFAULT 0;
DECLARE cur CURSOR FOR SELECT f_time,f_value  FROM this_yc201508;
-- 这一句一定要写无数据时done标志为1，否则会无循环的。
DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET done=1;
CREATE TEMPORARY TABLE IF NOT EXISTS avgDATA
(
	F_TIME VARCHAR(32),
	F_VALUE FLOAT
);
TRUNCATE avgDATA;
OPEN cur;
	FETCH cur INTO ftime,fvalue;
	WHILE (done<>1) 
	DO    
		SET i=i+1;
		SET  sumValue=sumValue+fvalue;
		SET  avgvalue=sumValue/i;
	    INSERT INTO avgDATA(F_TIME,F_VALUE) VALUES(ftime,avgvalue);
	    FETCH cur INTO ftime,fvalue;
        END WHILE;
CLOSE cur;
-- INSERT INTO avgDATA(F_TIME,F_VALUE) VALUES('1','11');

SELECT * FROM avgDATA;
/*set sqlstr="SELECT * FROM avgDATA ";
select sqlstr;
IF sqlstr<>"" THEN
begin
	SET @sqlCommand=sqlstr;   动态语句采用这种形式来写
	PREPARE STMT FROM @sqlCommand;  
		EXECUTE STMT; 
	DEALLOCATE PREPARE  STMT; 
end;
END IF; */  
 
END$$
DELIMITER ;  -- 没有这一句的话，mysql会把这段SQL当SQL语句而不是存储过程