问题描述
所以，我试图建立在
上面的主要限制是查询只返回特定日期的事件。我需要一个查询到任意日期范围（范围内每个日期的单独查询是不可接受的）
The main limitation above is the queries only return events for a specific date. I need a query to an arbitrary date range (separate query for each date in range is unacceptable)
CREATE TABLE `events` (
`event_id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`title` varchar(128) NOT NULL,
`description` varchar(1000) DEFAULT NULL,
`date_added` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (`event_id`),
) ENGINE=InnoDB AUTO_INCREMENT=4268 DEFAULT CHARSET=utf8
CREATE TABLE `events_dates` (
`events_date_id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`event_id` bigint(20) unsigned NOT NULL,
`date_start` date NOT NULL,
`date_end` date NOT NULL,
`time_start` time DEFAULT NULL,
`time_end` time DEFAULT NULL,
`repeat_interval` int(11) DEFAULT NULL COMMENT 'simple repetition: 1: repeat every x days, 2: every-other day, 7: every-7 days',
`repeat_year` smallint(4) DEFAULT NULL COMMENT 'NULL ("*") or year',
`repeat_month` tinyint(2) DEFAULT NULL COMMENT 'NULL ("*") or month (1-12)',
`repeat_day` tinyint(2) DEFAULT NULL COMMENT 'NULL ("*") or day of month (1-31)',
`repeat_nth_day` tinyint(1) DEFAULT NULL COMMENT 'use in combination with repeat_weekday',
`repeat_weekday` tinyint(1) DEFAULT NULL COMMENT 'NULL ("*") or 1=Sunday, 7=Saturday',
PRIMARY KEY (`events_date_id`),
KEY `event_id` (`event_id`),
CONSTRAINT `events_dates_ibfk_1` FOREIGN KEY (`event_id`) REFERENCES `events` (`event_id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=4268 DEFAULT CHARSET=utf8
此日期将于2016年每月第4个星期四重复
This date will repeat on the 4th Thursday of every month in 2016
`date_start` : "2016-01-01"
`date_end` : "2016-12-31"
`time_start` : NULL,
`time_end` : NULL,
`repeat_interval` : NULL
`repeat_year` : NULL
`repeat_month` : NULL
`repeat_day` : NULL
`repeat_nth_day` : 4
`repeat_weekday` : 5
以及查询以获取单个日期中发生的事件： / h1>
And a query to get events occurring on a single date:
CREATE DEFINER=`root`@`localhost` PROCEDURE `events_get_date`(_date DATE)
BEGIN
DECLARE _year INT DEFAULT YEAR(_date);
DECLARE _month INT DEFAULT MONTH(_date);
DECLARE _day INT DEFAULT DAYOFMONTH(_date);
DECLARE _nth_day INT DEFAULT 1 + floor((DAYOFMONTH(_date) - 1) / 7);
DECLARE _weekday INT DEFAULT DAYOFWEEK(_date);
SELECT e.*,
ed.`date_start`,
ed.`date_end`,
ed.`time_start`,
ed.`time_end`
FROM `events` e
JOIN `events_dates` ed ON ed.`event_id` = e.`event_id`
WHERE
(
(`date_start` <= _date) AND
(`date_end` >= _date) AND
(DATEDIFF(_date, `date_start`) % `repeat_interval` = 0)
) OR
(
(`date_start` <= _date) AND
(`date_end` >= _date) AND
(`repeat_year` IS NULL OR `repeat_year` = _year) AND
(`repeat_month` IS NULL OR `repeat_month` = _month) AND
(`repeat_day` IS NULL OR `repeat_day` = _day) AND
(`repeat_nth_day` IS NULL OR `repeat_nth_day` = _nth_day) AND
(`repeat_weekday` IS NULL OR `repeat_weekday` = _weekday)
)
GROUP BY e.`event_id`;
END
我遇到了一个返回事件的过程发生在日期范围内
特别是如果事件使用repeat_nth_day和repeat_weekday ...
例如：repeat_nth_day = 4和repeat_weekday = 5 （本月第4个星期四）。
I'm stuck coming up with a procedure to return events that occur within a date range
In particular if a event utilizes repeat_nth_day and repeat_weekday...
for example: repeat_nth_day = 4 and repeat_weekday = 5 (4th Thursday of the month). Trivial when querying a single date, but I have no idea how to do it for a date range.
这里是我到目前为止的情况：
Here's what I've got so far:
CREATE DEFINER=`root`@`localhost` PROCEDURE `_events_filter_get_range`(_date_start DATE, _date_end DATE)
BEGIN
DECLARE _dom_start INT DEFAULT DAYOFMONTH(_date_start);
DECLARE _dom_end INT DEFAULT DAYOFMONTH(_date_end);
DECLARE _month_start INT DEFAULT MONTH(_date_start);
DECLARE _month_end INT DEFAULT MONTH(_date_end);
DECLARE _year_start INT DEFAULT YEAR(_date_start);
DECLARE _year_end INT DEFAULT YEAR(_date_end);
DECLARE _day_diff INT DEFAULT DATEDIFF(_date_end, _date_start);
DECLARE _month_diff INT DEFAULT PERIOD_DIFF(EXTRACT(YEAR_MONTH FROM _date_end), EXTRACT(YEAR_MONTH FROM _date_start));
DECLARE _year_diff INT DEFAULT _year_end - _year_start;
#DECLARE _nth_day INT DEFAULT 1 + floor((DAYOFMONTH(_date) - 1) / 7);
#DECLARE _weekday INT DEFAULT DAYOFWEEK(_date);
SELECT
e.*,
ed.`date_start`,
ed.`date_end`,
ed.`time_start`,
ed.`time_end`
FROM `events` e
JOIN `events_dates` ed ON ed.`event_id` = e.`event_id`
WHERE
(
(`date_start` <= _date_end) AND
(`date_end` >= _date_start) AND
(ABS(DATEDIFF(_date_end, `date_start`)) % `repeat_interval` <= _day_diff)
) OR
(
(`date_start` <= _date_end) AND
(`date_end` >= _date_start) AND
(`repeat_year` IS NULL OR
`repeat_year` BETWEEN _year_start AND _year_end) AND
(`repeat_month` IS NULL OR
(_month_diff >= 11) OR
(_year_diff = 0 AND `repeat_month` BETWEEN _month_start AND _month_end) OR
# Dec 2015 - Jan 2015
(_year_diff = 1 AND (`repeat_month` <= _month_end OR `repeat_month` >= _month_start))
) AND
(`repeat_day` IS NULL OR
(_month_diff > 1) OR
# Jan 25 - Feb 26
(_month_diff = 1 AND _dom_start < _dom_end) OR
# Jan 25 - Feb 5
(_month_diff = 1 AND _dom_start > _dom_end AND (`repeat_day` <= _dom_end OR `repeat_day` >= _dom_start)) OR
# Jan 25 - Jan 26
(_month_diff = 0 AND _dom_start < _dom_end AND `repeat_day` BETWEEN _dom_start AND _dom_end)
)
/*
Here's where I'm stuck..
How do I check if a date range contains a
4th Thursday of the month (repeat_nth_day = 4, repeat_weekday = 5)
*/
/*
(`repeat_nth_day` IS NULL OR `repeat_nth_day` = _nth_day) AND
(`repeat_weekday` IS NULL OR `repeat_weekday` = _weekday)
*/
)
GROUP BY e.`event_id`;
END
是否可以？
？
感谢。
Is it possible?
Suggestions?
Thanks.
EDIT 看起来像我的大部分尝试都有缺陷。
EDIT looks like most of my attempt is flawed..
`date_start` : "2016-01-01"
`date_end` : "2017-12-31"
`time_start` : NULL,
`time_end` : NULL,
`repeat_interval` : NULL
`repeat_year` : NULL
`repeat_month` : 2
`repeat_day` : 1
`repeat_nth_day` : NULL
`repeat_weekday` : NULL
每2月1日重复
但是它会返回范围2016-02-15 - 2016-03-15，因为范围包括2月，包括1月（3月）...但不包括2月1日... ：（
Repeats every Feb 1however it would get returned in the range 2016-02-15 - 2016-03-15 because the range includes Feb and includes the 1st (of March)... but does not include the 1st of Feb... :(
推荐答案
我想出了一个解决方案，涉及到两件我没有很多经验的东西：temporary表格和循环我遍历日期范围并将每个日期结果插入到临时表中
I came up with an solution that involves 2 things that I don't have a lot of experience with: temporary tables and loops. I iterate over the date range and insert each dates results into a temporary table
REPEAT
# events_filter_date inserts into the temporary table
CALL events_filter_date(_date_cur);
SET _date_cur = DATE_ADD(_date_cur, INTERVAL 1 DAY);
UNTIL _date_cur > _date_end
END REPEAT;
SELECT *
FROM `events_temp`;
这篇关于日历循环/重复事件 - >在日期范围内查找活动的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！