Question

我有以下循环：

在tableA中查找具有特定值（@centre）
将@centre中的值复制到tableB
在@centre之前找到行并将它们添加到tableB（通过更新）
查找@centre之后的行并将它们添加到tableB（通过更新）

循环的每次迭代都会在tableB中生成一个新行。它做了应有的一切。然而，该功能需要永久（> 10分钟）来执行并且超时服务器。表A中有大约80k行，并且作为循环的结果，在tableB中生成~10k行。

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

DECLARE b1Tr varchar(10);
DECLARE b1S varchar(10);
DECLARE b1Ty varchar(10);
DECLARE b1US varchar(10);
DECLARE b1LS varchar(10);
DECLARE b1RC decimal(11,10);
DECLARE b1RCo varchar(10);
DECLARE ba1Tr varchar(10);
DECLARE ba1S varchar(10);
DECLARE ba1Ty varchar(10);
DECLARE ba1US varchar(10);
DECLARE ba1LS varchar(10);
DECLARE ba1RC decimal (11,10);
DECLARE ba1RCo varchar(10);
DECLARE ba2RC varchar(10);

DECLARE final datetime;
DECLARE centre datetime;
DECLARE x int;

SET x = 0;

SET @final = (select MQLTime from tableA where BarSize<=1
order by mqltime desc limit 1);

REPEAT

SET @centre = (select MQLTime from tableA where BarSize<=1 
order by mqltime asc limit x,1);

SET @b1Tr = (select Trend from tableA where MQLtime < @centre order by mqltime desc limit 1);
SET @b1S = (select Size from tableA where MQLtime < @centre order by mqltime desc limit 1);
SET @b1Ty = (select Type from tableA where MQLtime < @centre order by mqltime desc limit 1);
SET @b1US = (select US from tableA where MQLtime < @centre order by mqltime desc limit 1);
SET @b1LS = (select LS from tableA where MQLtime < @centre order by mqltime desc limit 1);
SET @b1RC = (select close from tableA where MQLtime = @centre order by MQLTime desc limit 1) - 
            (select close from tableA where MQLtime < @centre order by MQLTime desc limit 1);

SET @ba1Tr = (select Trend from tableA where MQLtime > @centre order by mqltime desc limit 1);
SET @ba1S = (select Size from tableA where MQLtime > @centre order by mqltime desc limit 1);
SET @ba1Ty = (select Type from tableA where MQLtime > @centre order by mqltime desc limit 1);
SET @ba1US = (select US from tableA where MQLtime > @centre order by mqltime desc limit 1);
SET @ba1LS = (select LS from tableA where MQLtime > @centre order by mqltime desc limit 1);
SET @ba1RC = (select close from tableA where MQLtime > @centre order by MQLTime desc limit 1) - 
            (select close from tableA where MQLtime = @centre order by MQLTime desc limit 1);
SET @ba2RC = (select close from tableA where MQLtime > @centre order by MQLTime asc limit 1,1) - 
            (select close from tableA where MQLtime = @centre order by MQLTime desc limit 1);

if @b1RC>0 then set @b1RCo = 'Up'; 
elseif @b1RC<0 then set @b1RCo='Down'; 
elseif @b1RC=0 then set @b1RCo='Flat';
end if;

if @ba1RC>0 then set @ba1RCo = 'Up'; 
elseif @ba1RC<0 then set @ba1RCo='Down'; 
elseif @ba1RC=0 then set @ba1RCo='Flat';
end if;

if @ba2RC>0 then set @ba2RCo = 'Up'; 
elseif @ba2RC<0 then set @ba2RCo='Down'; 
elseif @ba2RC=0 then set @ba2RCo='Flat';
end if;

INSERT IGNORE INTO tableB (MQLrefTime,dTr,dS,dTy,dUS,dLS) 
select MQLTime,Trend,Size,Type,US,LS 
from tableA where MQLTime = @centre 
order by MQLTime asc limit 1; 

update tableA_doji_model
SET b1Tr = @b1Tr,
    b1S = @b1S,
    b1Ty = @b1Ty,
    b1US = @b1US,
    b1LS = @b1LS,
    b1RC = @b1RCo,
    ba1Tr = @ba1Tr,
    ba1S = @ba1S,
    ba1Ty = @ba1Ty,
    ba1US = @ba1US,
    ba1LS = @ba1LS,
    ba1RC = @ba1RCo,
    ba2RC = @ba2RCo
order by mqlreftime desc limit 1;

SET x=x+1;

UNTIL @centre=@final
END REPEAT;

END $$
DELIMITER ;

表A的一个例子：

      |colA | colB | colC | colD |
row 1 |val1 | val2 | val3 | val4 |
row 2 |val5 | val6 | val7 | val8 |
row 3 |val9 |val10 |val11 |val12 |

tableB（输出表）

      |colA | colB | colC | colD | colE | colF | colG | colH | colI | colJ |
row 1 |val5 | val2 | val3 | val4 | val6 | val7 | val8 |val10 |val11 |val12 |

tableB中数据的重新排列代表了真实表格。

任何人都可以看到循环超时服务器的任何原因（错误2013）？

数据重新排列循环超时服务器

0 个答案: