Matlab和MySQl，结果不一致

Question

我在将数据从MySQL加载到Matlab时遇到问题。

我正在运行存储过程。当我从MySQL运行它时，返回1,500行。

当我从Matlab运行它时，它会在我第一次启动Matlab时返回1条记录。如果我重新运行它几次，我最终可能会获得1,500行。早些时候需要30分钟才会返回1,500行。

我的商店程序是：

-- --------------------------------------------------------------------------------
-- Routine DDL
-- Note: comments before and after the routine body will not be stored by the server
-- --------------------------------------------------------------------------------
DELIMITER $$

CREATE DEFINER=`root`@`localhost` PROCEDURE `latest_hl_tradables`()
BEGIN

DECLARE latest_date DATE ;

SELECT max(available_on_platform.on_date)
FROM available_on_platform 
INNER JOIN platform ON (available_on_platform.platform_id=platform.id)
where platform.name='aaa'
INTO latest_date;



SELECT fund_id,fund_class_id,fund_class.name as fund_class_name,sedol,isin,max(on_date) as on_date
FROM available_on_platform
INNER JOIN fund_class ON (fund_class.id=available_on_platform.fund_class_id)
INNER JOIN platform ON (available_on_platform.platform_id=platform.id)

WHERE on_date>=latest_date-5
AND platform.name='aaa'

GROUP BY fund_class_id,fund_class.name,sedol,isin;

END

我的Matlab代码是：

conn=database('fund_data3','','');
sql = 'call latest_hl_tradables()';
curs = exec(conn,sql);   
curs = fetch(curs);