所以我有一个如下所示的SQL表
+---------+-------------+-------------+------------------+-----------------+
| Barcode | Time1 | Time2 | Frame for time 1 | Frame for time2 |
+---------+-------------+-------------+------------------+-----------------+
| 1 | 10:20:34.25 | 23:59:59.25 | NULL | NULL |
| | | | | |
+---------+-------------+-------------+------------------+-----------------+
我想要一种方法来计算Time1和Time2的帧,就像下面的网站http://www.zapstudio.net/framecalc/一样,以便生成下表
+---------+-------------+-------------+------------------+-----------------+
| Barcode | Time1 | Time2 | Frame for time 1 | Frame for time2 |
+---------+-------------+-------------+------------------+-----------------+
| 1 | 10:20:34.25 | 23:59:59.25 | 930880 | 2160000 |
| | | | | |
+---------+-------------+-------------+------------------+-----------------+
但是在计算帧期间,我希望从另一个表中读取每个条形码的帧速率
+---------+--------+------------+
| Barcode | Format | Frame Rate |
+---------+--------+------------+
| 1 | 1080p | 25 |
+---------+--------+------------+
一旦您了解到帧速率只是每秒帧数这一事实,这是一个简单的计算。你只需要将你的时间转换为秒并在看似小数点之后添加值,但它只是额外的帧。以下计算使用隐式转换为时间,但它限制为23:59:59。如果需要更大的值,可以设置更复杂的转换。它也没有考虑不正确的格式。
CREATE TABLE #Barcodes(
Barcode int,
Time1 varchar(11),
Time2 varchar(11),
FramesForTime1 int,
FramesForTime2 int
)
INSERT INTO #Barcodes(Barcode, Time1, Time2)
VALUES( 1, '10:20:34.25', '23:59:59.25')
CREATE TABLE #FrameRates(
Barcode int,
Format varchar(11),
FrameRate int
)
INSERT INTO #FrameRates VALUES( 1, '1080p', 25);
SELECT bc.Barcode,
bc.Time1,
bc.Time2,
DATEDIFF( ss, 0, LEFT( Time1, 8)) * Fr.FrameRate + RIGHT(Time1, 2) AS FramesForTime1,
DATEDIFF( ss, 0, LEFT( Time2, 8)) * Fr.FrameRate + RIGHT(Time2, 2) AS FramesForTime2,
fr.Format,
fr.FrameRate
FROM #Barcodes bc
JOIN #FrameRates fr ON bc.Barcode = fr.Barcode
GO
DROP TABLE #Barcodes, #FrameRates
我同意那些暗示不存储这些价值观的评论。但是,您可以创建计算列,这些列将在需要时动态计算。
数学公式为:([小时] * 3600 + [分钟] * 60 + [秒])* [frame_rate] + [毫秒]
这是更新表的代码:
CREATE TABLE #FramesConfig
(
Barcode int,
Format varchar(8),
FrameRate int
)
CREATE TABLE #Frames
(
Barcode int,
Time1 time(2),
Time2 time(2),
FrameForTime1 int,
FrameForTime2 int
)
INSERT INTO #FramesConfig
VALUES(1, '1080p', 25)
INSERT INTO #Frames
VALUES (1, '10:20:34.25', '23:59:59.25', NULL, NULL)
UPDATE f
SET FrameForTime1 = DATEDIFF(SS, 0, f.Time1) * fc.FrameRate + RIGHT(f.Time1, 2),
FrameForTime2 = DATEDIFF(SS, 0, f.Time2) * fc.FrameRate + RIGHT(f.Time2, 2)
FROM #Frames f
INNER JOIN #FramesConfig fc ON f.Barcode = fc.Barcode
SELECT *
FROM #Frames
DROP TABLE #Frames
DROP TABLE #FramesConfig