mysql自定义函数

与vba交互不方便python写，做一个很简单的 有了就更新，没有就插入表的函数。

用的是navicat的工具

参数：

IN yahoo_code varchar(20) , IN begin_date char(10), IN end_date char(10)

函数内容：

BEGIN    
DECLARE stockArea VARCHAR(20);
select b.marketName into @stockArea from Instruments a LEFT JOIN Markets b on a.marketId = b.marketId where a.YahooCode=CONVERT(yahoo_code USING utf8) COLLATE utf8_unicode_ci;
#set @stockArea = "China";
set @stockArea =CONCAT("HistPrices",@stockArea);
set @STMT := CONCAT("select a.* from ",@stockArea," a LEFT JOIN Instruments b on a.instrumentId=b.instrumentId  where b.YahooCode=CONVERT('",yahoo_code,"' USING utf8) COLLATE utf8_unicode_ci and a.tradeDate >= '",begin_date,"' and a.tradeDate <= '",end_date,"' ");
PREPARE STMT FROM @STMT;   
EXECUTE STMT;  
END