方法一：

CREATE DEFINER=`root`@`%` FUNCTION `timeDifference`(Dirty VARCHAR ( 500 )) RETURNS text CHARSET utf8

DETERMINISTIC

BEGIN

IF Dirty<0 THEN

SET Dirty= TRIM(LEADING '-' FROM Dirty);

SET Dirty = CONCAT('-',

cast( FLOOR(Dirty / 86400)*24+(Dirty % 86400 / 3600) ?AS signed INTEGER ),

'時',

cast( Dirty % 86400 % 3600 / 60 AS signed INTEGER ),

'分',

cast( Dirty % 86400 % 3600 % 60 AS signed INTEGER ),

'秒'

);

ELSE

SET Dirty = CONCAT(

cast( FLOOR(Dirty / 86400)*24+(Dirty % 86400 / 3600) ?AS signed INTEGER ),

'時',

cast( Dirty % 86400 % 3600 / 60 AS signed INTEGER ),

'分',

cast( Dirty % 86400 % 3600 % 60 AS signed INTEGER ),

'秒'

);

END IF;

RETURN Dirty;

END

注：這種計算有問題9728秒時，轉換成時分秒有一小時誤差。別的沒發現問題！應該是小數點后面死循環的原因，有大神發現其他原因請留言。

方法二：

CREATE DEFINER=`root`@`localhost` FUNCTION `timeDifference`(Dirty VARCHAR ( 500 )) RETURNS text CHARSET utf8

DETERMINISTIC

BEGIN

DECLARE a integer(10);

DECLARE b integer(10);

DECLARE c integer(10);

DECLARE d integer(10);

DECLARE e integer(10);

DECLARE f integer(10);

DECLARE timeDif VARCHAR ( 500 );

set a=0;

set d=0;

set f=0;

IF Dirty<0 THEN

SET timeDif= TRIM(LEADING '-' FROM Dirty);

ELSE

SET timeDif=Dirty;

END IF;

set a =cast( timeDif ?% 60 AS signed INTEGER ) ;#秒

set b =timeDif-a;#時間差

IF b > 0 THEN

set c=cast( b / 60 AS signed INTEGER );

set d=cast( c % 60 AS signed INTEGER );#分

set e=c-d;

END IF;

IF e > 0 THEN

set f = cast( e / 60 AS signed INTEGER );#時

END IF;

IF Dirty < 0 THEN

set Dirty=CONCAT('-',f,'時',d,'分',a,'秒');

ELSE

set Dirty=CONCAT(f,'時',d,'分',a,'秒');

END IF;

RETURN Dirty;

END

這種計算目前沒發現問題。有更好的請留言。

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