Question

以下脚本旨在具有以下功能：

在eurusd_m1中找到一行，其中volume = 250，
找到第1行之前的行
找到第1行之后的行

将这些行中的所需值复制到obsh4中的单行

Create procedure doji_result ()
begin 

DECLARE initial DATETIME;
DECLARE final DATETIME;
DECLARE centre DATETIME;
DECLARE x int;

SET x = 0;

SET @initial = (select MQLTime from eurusd_m1 where volume=250 
order by mqltime asc limit 1);

SET @final = (select MQLTime from eurusd_m1 where volume=250 
order by mqltime desc limit 1);

REPEAT

SET @centre = (select MQLTime from eurusd_m1 where volume=250 
order by mqltime asc limit x,1);

INSERT INTO obsh4 (MQLrefTime,RrefTime,Open,High,Low,Close,Volume) 
select MQLTime,RTime,Open,high,Low,Close,Volume 
from eurusd_m1 where MQLTime = @centre 
order by MQLTime asc limit 1; 

INSERT INTO obsh4 (Open2,High2,Low2,Close2,Volume2) 
select Open,high,Low,Close,Volume 
from eurusd_m1 where MQLTime < @centre 
order by MQLTime desc limit 1; 

INSERT INTO obsh4 (Open3,High3,Low3,Close3,Volume3) 
select Open,high,Low,Close,Volume 
from eurusd_m1 where MQLTime > @centre 
order by MQLTime asc limit 1; 

SET x=x+1;

UNTIL @centre=@final
END REPEAT;

END $$
DELIMITER ;

当我运行它时，eurusd_m1中的每一行都被复制到obsh4中的一个新行（而不是所有三行在每次循环迭代时都折叠成一行）

我尝试使用UPDATE使用以下脚本添加第二行和第三行数据但是我在FROM上遇到语法问题而我不确定如何解决这个问题：/

update obsh4
set  Open2 = open,
     High2 = high,
     Low2 = low,
     Close2 = close,
     Volume2 = volume, 
from select Open,high,Low,Close,Volume from eurusd_m1
where
MQLTime < @centre order by MQLTime desc limit 1;

我可以看到三个选项：

1）需要纠正更新声明

2）需要在插入第二行/第三行时添加行规范

3）从头开始装箱并生成东西。

对这两种方面的任何建议都是最受欢迎的。谢谢

编辑：循环本身运行正常，并且已经过独立于当前问题的测试。

Answer 1

这段冗长的代码回答了问题。我想我可以稍微简化一下，所以我很乐意接受建议。

drop procedure if exists doji_result; 
DELIMITER $$
Create procedure doji_result ()
begin 

DECLARE final DATETIME;
DECLARE centre DATETIME;
DECLARE openB1 DOUBLE;
DECLARE highB1 DOUBLE;
DECLARE lowB1 DOUBLE;
DECLARE closeB1 DOUBLE;
DECLARE volumeB1 DOUBLE;
DECLARE openA1 DOUBLE;
DECLARE highA1 DOUBLE;
DECLARE lowA1 DOUBLE;
DECLARE closeA1 DOUBLE;
DECLARE volumeA1 DOUBLE;

DECLARE x int;

SET x = 0;

SET @final = (select MQLTime from eurusd_m1 where volume=250 
order by mqltime desc limit 1);

REPEAT

SET @centre = (select MQLTime from eurusd_m1 where volume=250 
order by mqltime asc limit x,1);

SET @openB1 = (select open from eurusd_m1 where MQLtime < @centre order by mqltime desc limit 1);
SET @highB1 = (select high from eurusd_m1 where MQLtime < @centre order by mqltime desc limit 1);
SET @lowB1 = (select low from eurusd_m1 where MQLtime < @centre order by mqltime desc limit 1);
SET @closeB1 = (select close from eurusd_m1 where MQLtime < @centre order by mqltime desc limit 1);
SET @volumeB1 = (select volume from eurusd_m1 where MQLtime < @centre order by mqltime desc limit 1);

SET @openA1 = (select open from eurusd_m1 where MQLtime > @centre order by mqltime asc limit 1);
SET @highA1 = (select high from eurusd_m1 where MQLtime > @centre order by mqltime asc limit 1);
SET @lowA1 = (select low from eurusd_m1 where MQLtime > @centre order by mqltime asc limit 1);
SET @closeA1 = (select close from eurusd_m1 where MQLtime > @centre order by mqltime asc limit 1);
SET @volumeA1 = (select volume from eurusd_m1 where MQLtime > @centre order by mqltime asc limit 1);

INSERT INTO obsh4 (MQLrefTime,RrefTime,Open,High,Low,Close,Volume) 
select MQLTime,RTime,Open,high,Low,Close,Volume 
from eurusd_m1 where MQLTime = @centre 
order by MQLTime asc limit 1; 

update obsh4
SET open2 = @openB1,
    high2 = @highB1,
    low2 = @lowB1,
    close2 = @closeB1,
    volume2 = @volumeB1,
    open3 = @openA1,
    high3 = @highA1,
    low3 = @lowA1,
    close3 = @closeA1,
    volume3 = @volumeA1
order by mqlreftime desc limit 1;

SET x=x+1;

UNTIL @centre=@final
END REPEAT;

END $$
DELIMITER ;

将多行插入单行mysql

1 个答案: