重复事件,SQL查询

Question

重复事件,SQL查询

bla*_*out 7 mysql sql recurring-events rfc5545

我知道有关重复发生的事件的问题很常见,但我无法找到一个能够回答这个特定问题的问题,而不是那些与日历应用程序有关的重复事件.主要区别在于我们的应用程序中的事件.只会在报告中或通过他们自己而不是以日历格式出现,尽管在许多方面它们非常相似,可能只是与日历相关的行李较少.

与日历应用程序类似.事件可以一次性发生,也可以重复发生,例如每个星期四或每个月的第一个星期一,直到将来某个预先设定的时间.

事件存储在事件表中,该事件表包含开始和结束日期以及"重新加密类型ID".如果'reurrency type'为'None',则开始日期和结束日期将相同.事件表将id保存到一个单独的表中,该表保存事件类型名称,例如'Meeting'或'Weekly report'

还有一个表格,其中包含"重复种类型"列表,例如"不再发生","每个星期一","每月的第一个星期一"和"月的最后一个星期六".

为了使查找更容易,另一个表包含1960年至2060年的日期列表以及有关每个日期的相关信息,例如是否是星期一,以及星期一的星期几.

这允许查找如下:

SELECT DISTINCT(e.eventid),n.nameid,n.firstname,n.lastname,d.dt,r.recurring
FROM dates d 
LEFT JOIN recurringtypes r
/* if event recurring every week E.g. 'Every Monday' */
ON (r.rectypeid BETWEEN 2 AND 8 AND r.day = d.dow) 
/* if event recurring every month E.g. 'First Monday, every month' */
OR ((r.rectypeid BETWEEN 9 AND 36) AND r.day = d.dow AND r.occurrence = d.occurrence) 
/* if event recurring every last week of month E.g. 'Last Monday, every month' */
OR (r.rectypeid >= 37 AND r.day = d.dow and r.islast = d.islast)
LEFT JOIN events e on e.rectypeid = r.rectypeid
LEFT JOIN eventtypes t ON e.eventtypeid = t.eventtypeid
LEFT JOIN names n ON e.namesid = n.namesid
WHERE (d.dt BETWEEN '2012/02/01' AND '2012/05/01')
ORDER BY d.dt;

+-----------+---------------+-------------------+-----------+------------+-------------------------------+
| eventid   | nameid        | lastname          | firstname | dt         | recurring                     |
+-----------+---------------+-------------------+-----------+------------+-------------------------------+
|   3291788 |       1728449 | smith             | zoe       | 2012-02-02 | First Thursday, every month   |
|   3291797 |       1765432 |                   |           | 2012-02-05 | First Sunday, every month     |
|   3291798 |       1730147 |                   |           | 2012-02-05 | First Sunday, every month     |
|   3291803 |       1790061 | Carpenter         | Richie    | 2012-02-06 | Every Monday                  |
|   3291805 |       1790061 | Carpenter         | Richie    | 2012-02-08 | Second Wednesday, every month |
|   3291803 |       1790061 | Carpenter         | Richie    | 2012-02-13 | Every Monday                  |
|   3291799 |       1790061 | Carpenter         | Richie    | 2012-02-15 | Third Wednesday, every month  |
|   3291803 |       1790061 | Carpenter         | Richie    | 2012-02-20 | Every Monday                  |

要获得无重复事件,可以使用更简单的查询:

SELECT n.nameid,n.lastname,n.firstname,e.firstdate,e.eventid,'No' as Recurring
FROM events e
LEFT JOIN names n ON n.names = e.namesid 
AND e.rectypeid <= 1 
AND e.firstdate BETWEEN '2012/02/01' AND '2012/05/01' 
AND e.eventid IS NOT NULL ORDER BY e.firstdate;

CREATE TABLE events (
eventid int(11) NOT NULL AUTO_INCREMENT,
eventtypeid int(11) DEFAULT '0',
firstdate date DEFAULT '1960-01-01' COMMENT 'First event',
lastdate date DEFAULT '1960-01-01' COMMENT 'Last event',
rectypeid int(11) DEFAULT '1'
);
+---------+-------------+------------+------------+-----------+
| eventid | eventtypeid | firstdate  | lastdate   | rectypeid |
+---------+-------------+------------+------------+-----------+
| 3291803 |          16 | 2012-02-03 | 2012-04-11 |         3 |
| 3291797 |           8 | 2012-02-12 | 2012-02-22 |         9 |
| 3291798 |           5 | 2012-02-12 | 2012-02-12 |         9 |
| 3291788 |           8 | 2012-05-24 | 2015-01-16 |        13 |
| 3291805 |          10 | 2012-01-04 | 2012-02-14 |        19 |
| 3291799 |          16 | 2012-02-07 | 2012-10-24 |        26 |
| 3291804 |           5 | 2012-02-03 | 2012-08-22 |        41 |
+---------+-------------+------------+------------+-----------+
CREATE TABLE cmseventtypes (
eventtypeid int(11) NOT NULL AUTO_INCREMENT,
eventtype varchar(50) DEFAULT '' COMMENT 'Event type AKA name'
);
+-------------+----------------------+
| eventtypeid | eventype             | 
+-------------+----------------------+
|           1 | Follow up meeting    |
|           2 | Reminder email due   |
|           3 | Monthly meeting      |
|           4 | Weekly report        |
|           5 | Golf practice        |
+------------------------------------+
CREATE TABLE recurringtypes (
rectypeid int(11) NOT NULL AUTO_INCREMENT,
recurring varchar(40) DEFAULT '',
day tinyint(4) DEFAULT '0',
occurrence tinyint(4) DEFAULT '0',
islast tinyint(4) DEFAULT '0'
);
+-----------+---------------------------+------+------------+--------+
| rectypeid | recurring                 | day  | occurrence | islast |
+-----------+---------------------------+------+------------+--------+
|         1 | No                        |    0 |          0 |      0 |
|         2 | Every Sunday              |    1 |          0 |      0 |
|         3 | Every Monday              |    2 |          0 |      0 |
|         4 | Every Tuesday             |    3 |          0 |      0 |
|         5 | Every Wednesday           |    4 |          0 |      0 |
|         6 | Every Thursday            |    5 |          0 |      0 |
|         7 | Every Friday              |    6 |          0 |      0 |
|         8 | Every Saturday            |    7 |          0 |      0 |
|         9 | First Sunday, every month |    1 |          1 |      0 |
|        10 | First Monday, every month |    2 |          1 |      0 |
+-----------+---------------------------+------+------------+--------+
CREATE TABLE dates (
dt date NOT NULL COMMENT 'Date',
daycount mediumint(9) NOT NULL DEFAULT '1',
year smallint(6) NOT NULL DEFAULT '1970',
month tinyint(4) NOT NULL DEFAULT '1',
dom tinyint(4) NOT NULL DEFAULT '1',
dow tinyint(4) NOT NULL DEFAULT '1',
occurrence tinyint(4) NOT NULL DEFAULT '0',
islast tinyint(1) NOT NULL DEFAULT '0'
);
+------------+----------+------+-------+-----+-----+------------+--------+
| dt         | daycount | year | month | dom | dow | occurrence | islast |
+------------+----------+------+-------+-----+-----+------------+--------+
| 2012-02-02 |   734900 | 2012 |     2 |   2 |   5 |          1 |      0 |
| 2012-02-03 |   734901 | 2012 |     2 |   3 |   6 |          1 |      0 |
| 2012-02-04 |   734902 | 2012 |     2 |   4 |   7 |          1 |      0 |
| 2012-02-05 |   734903 | 2012 |     2 |   5 |   1 |          1 |      0 |
| 2012-02-06 |   734904 | 2012 |     2 |   6 |   2 |          1 |      0 |
| 2012-02-07 |   734905 | 2012 |     2 |   7 |   3 |          1 |      0 |
| 2012-02-08 |   734906 | 2012 |     2 |   8 |   4 |          2 |      0 |
| 2012-02-09 |   734907 | 2012 |     2 |   9 |   5 |          2 |      0 |
+------------+----------+------+-------+-----+-----+------------+--------+

我们并非完全使用上面的代码或表格布局,欢迎任何有效的解决方案.请不要指向我:

你会如何存储可能的经常性时间？

在日历应用程序中为重复事件建模的最佳方法是什么？

在构建日历应用程序时,我应该在数据库中存储日期或重复规则吗？

要么

http://tools.ietf.org/html/rfc5545

我已经检查了它们,它们非常有用,但没有像我们想要的那样做.

TIA

Answer 1

bla*_*out 3

除非我遗漏了什么，否则答案非常简单。我没有意识到 UNION 可以通过使用别名对公共列进行排序，即使这些列来自不同的表。所以完整的查询是：

SELECT DISTINCT(e.eventid),n.nameid,n.firstname,n.lastname,d.dt AS dait,r.recurring
FROM dates d 
LEFT JOIN recurringtypes r
/* if event recurring every week E.g. 'Every Monday' */
ON (r.rectypeid BETWEEN 2 AND 8 AND r.day = d.dow) 
/* if event recurring every month E.g. 'First Monday, every month' */
OR ((r.rectypeid BETWEEN 9 AND 36) AND r.day = d.dow AND r.occurrence = d.occurrence) 
/* if event recurring every last week of month E.g. 'Last Monday, every month' */
OR (r.rectypeid >= 37 AND r.day = d.dow and r.islast = d.islast)
LEFT JOIN events e on e.rectypeid = r.rectypeid
LEFT JOIN eventtypes t ON e.eventtypeid = t.eventtypeid
LEFT JOIN names n ON e.namesid = n.namesid
WHERE (d.dt BETWEEN '2012/02/01' AND '2012/05/01')
UNION
SELECT e.eventid,n.nameid,n.lastname,n.firstname,e.firstdate AS dait,'No' as Recurring
FROM events e
LEFT JOIN names n ON n.names = e.namesid 
AND e.rectypeid <= 1 
WHERE e.firstdate BETWEEN '2012/02/01' AND '2012/05/01' 
ORDER BY dait;

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有人指出，使用表格查找日期是有风险的，因为日期最终会用完，这是事实，但计算日期是否是，例如，一个月中的第一个星期一（或第二个或第四个星期一）或者也许是第四个也是最后一个），似乎是一段比我现在想要了解的更复杂的 SQL 代码。

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