Question

我有一张表格如下：

CREATE TABLE `zonetimes` (
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `zone_id` int(10) unsigned NOT NULL,
  `active_from_day` tinyint(1) unsigned NOT NULL DEFAULT '2',
  `active_to_day` tinyint(1) unsigned NOT NULL DEFAULT '2',
  `active_from` time NOT NULL,
  `active_to` time NOT NULL
  PRIMARY KEY (`id`)
) ENGINE=MyISAM ;

因此，用户可以在特定日期和时间开始添加时间条目，并在特定日期和时间结束，例如：周一08:00至周五18:00或周四15:00至周二15:00（注意周末的交叉）。

我需要查询这些数据并确定某个区域当前是否处于活动状态（NOW（），DAYOFWEEK（）等）......这结果非常棘手。

如果我没有重叠，例如：从'星期三晚上8点到星期二凌晨4点'或者从'星期四下午4点到星期二下午4点'，这对BETWEEN来说很容易。

此外，需要允许用户添加整个星期，例如：星期一早上8点 - 星期一早上8点（这应该很容易，例如：where（active_from_day = active_to_day AND active_from = active_to）OR ..

有什么想法吗？

注意：我在Timespan - Check for weekday and time of day in mysql找到了类似的问题，但没有得到答案。其中一个建议是将每一天存储为一个单独的行。我宁愿存储多天的一段时间。

更新

Terje D的查询完美无缺。一些测试场景：

+---------------------+-----------------+---------------+-------------+-----------+------------+
| NOW( )              | active_from_day | active_to_day | active_from | active_to | active_now |
+---------------------+-----------------+---------------+-------------+-----------+------------+
| 2012-10-31 23:41:55 |               1 |             4 | 08:00:00    | 23:40:00  |          0 |
| 2012-10-31 23:42:25 |               1 |             4 | 08:00:00    | 23:45:00  |          1 |
| 2012-10-31 23:42:57 |               4 |             1 | 08:00:00    | 09:45:00  |          1 |
| 2012-10-31 23:43:36 |               4 |             4 | 23:00:00    | 09:45:00  |          1 |
| 2012-10-31 23:44:10 |               5 |             4 | 00:00:00    | 23:44:00  |          0 |
| 2012-10-31 23:44:27 |               5 |             4 | 00:00:00    | 23:45:00  |          1 |
| 2012-10-31 23:45:14 |               2 |             2 | 00:00:00    | 00:00:00  |          0 |

上面的结果是通过运行几次Terje的查询生成的：

SELECT NOW( ) , active_from_day, active_to_day, active_from, active_to, (
DAYOFWEEK( NOW( ) ) > active_from_day
OR DAYOFWEEK( NOW( ) ) = active_from_day
AND TIME( NOW( ) ) > active_from
)
AND (
DAYOFWEEK( NOW( ) ) < active_to_day
OR DAYOFWEEK( NOW( ) ) = active_to_day
AND TIME( NOW( ) ) < active_to
)
OR (
active_from_day > active_to_day
OR active_from_day = active_to_day
AND active_from > active_to
)
AND (
(
DAYOFWEEK( NOW( ) ) > active_from_day
OR DAYOFWEEK( NOW( ) ) = active_from_day
AND TIME( NOW( ) ) > active_from
)
OR (
DAYOFWEEK( NOW( ) ) < active_to_day
OR DAYOFWEEK( NOW( ) ) = active_to_day
AND TIME( NOW( ) ) < active_to
)
) AS active_now FROM zonetimes

Answer 1

这个逻辑应该是：

IF active_to >= active_from AND NOW() BETWEEN active_from AND active_to
OR active_to < active_from AND NOW NOT BETWEEN active_to AND active_from

即

IF (DAYOFWEEK(NOW()) > active_from_day 
   OR DAYOFWEEK(NOW()) = active_from_day AND TIME(NOW()) > active_from)
AND (DAYOFWEEK(NOW()) < active_to_day
   OR DAYOFWEEK(NOW()) = active_to_day AND TIME(NOW()) < active_to)
OR (active_from_day > active_to_day 
   OR active_from_day = active_to_day AND active_from > active_to)
AND ((DAYOFWEEK(NOW()) > active_from_day 
   OR DAYOFWEEK(NOW()) = active_from_day AND TIME(NOW()) > active_from)
OR (DAYOFWEEK(NOW()) < active_to_day
   OR DAYOFWEEK(NOW()) = active_to_day AND TIME(NOW()) < active_to))

（如果时间是在开始之后和结束之前，则区域处于活动状态，或者如果开始＆gt;结束，时间是在开始之后或结束之前）

Answer 2

报废，看看Terje D的回答。

一种可能的方法（导致查询混乱）使用Skpd的想法：

我创建了一个开始日（在周一到周日的tinyint 0到6），然后是一个开始时间（从午夜开始的int分钟）和一个范围（int minutes）。因此，区域处于活动状态的时间段介于（day_of_week + start）和（day_of_week + start + range）之间。当queryig我查询上周的时间段时，以及本周的时间段来捕获两者。我很确定有更优雅的方法，但我认为它适用于所有组合。并将存储空间保持在最低限度

CREATE TABLE `azonetimes` (
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `zone_id` int(10) unsigned NOT NULL,
  `day_of_week` tinyint(1) unsigned NOT NULL DEFAULT '2',
  `start` int(11) unsigned NOT NULL DEFAULT '0',
  `range` int(11) unsigned NOT NULL DEFAULT '0',
  PRIMARY KEY (`id`)
) ENGINE=MyISAM ;

查询:(周三07:50 am）

    SELECT 
        azonetimes.*, (
            NOW() 
            #Check for last week
            BETWEEN     
                        (FROM_UNIXTIME(UNIX_TIMESTAMP(DATE(CURDATE() - INTERVAL WEEKDAY( CURDATE() ) - CAST(azonetimes.day_of_week AS SIGNED INT) +
                        IF( WEEKDAY( CURDATE() ) >  CAST(azonetimes.day_of_week AS SIGNED INT), 0, 7 ) - 7 DAY )) + `start`*60) )
                    AND (FROM_UNIXTIME(UNIX_TIMESTAMP(DATE(CURDATE() - INTERVAL WEEKDAY( CURDATE() ) - CAST(azonetimes.day_of_week AS SIGNED INT) +
                        IF( WEEKDAY( CURDATE() ) >  CAST(azonetimes.day_of_week AS SIGNED INT), 0, 7 ) - 7 DAY )) + ((`range` + `start`)*60)))
            )
        OR 
        (
            NOW() 
            #Check for this week
            BETWEEN     
                        (FROM_UNIXTIME(UNIX_TIMESTAMP(DATE(CURDATE() - INTERVAL WEEKDAY( CURDATE() ) - CAST(azonetimes.day_of_week AS SIGNED INT) +
                        IF( WEEKDAY( CURDATE() ) >  CAST(azonetimes.day_of_week AS SIGNED INT), 0, 7 )  DAY )) + `start`*60) )
                    AND (FROM_UNIXTIME(UNIX_TIMESTAMP(DATE(CURDATE() - INTERVAL WEEKDAY( CURDATE() ) - CAST(azonetimes.day_of_week AS SIGNED INT) +
                        IF( WEEKDAY( CURDATE() ) >  CAST(azonetimes.day_of_week AS SIGNED INT), 0, 7 )  DAY )) + ((`range` + `start`)*60)))
            )
        AS open
        FROM azonetimes


+----+---------+-------------+-------+-------+------+
| id | zone_id | day_of_week | start | range | open |
+----+---------+-------------+-------+-------+------+
|  1 |       1 |           2 |   300 |   900 |    1 |   << Wed 5am to 8pm
|  2 |       0 |           1 |     0 |  2400 |    1 |   << Tue 00:00 to Wed 4pm (40 hrs)
|  3 |       4 |           4 |   300 |   900 |    0 |   << Fri 5am to 8pm
|  4 |       0 |           5 |   900 |  7200 |    1 |   << Sat 3pm to Thu 3pm
+----+---------+-------------+-------+-------+------+

MySql检查NOW（）是否属于工作日/时间范围

更新

2 个答案: