代表“重复事件”的最佳方式是什么？在数据库中？ [英] What is the best way to represent "Recurring Events" in database?
问题描述
代表数据库中的重复事件的最佳方式是什么？
更多详细信息：
在创建活动的同时我也向某些用户发送邀请，被邀请者只能在指定的窗口（会议期限）内登录会议，或者被邀请者在5分钟前尝试登录时可能会拒绝登录计划的会议开始。
sysjobs ， sysjobsschedule 和SQL Server中的 sysschedules 表做一个漂亮的这个很好。我不会重塑轮子，我只是复制他们的设计。
以下是 sysschedules中的一些重要字段
freq_type
此计划的作业运行频率。
1 =仅一次
4 =每日
8 =每周
16 =每月
32 =每月，相对于freq_interval
64 = SQL Server代理服务启动时运行
128 =计算机空闲时运行
freq_interval
作业执行。取决于freq_type的值。默认值为0，表示freq_interval未使用。
freq_type的值freq_interval
1（一次）freq_interval未使用（0）
4（每天）每个freq_interval天
8（每周）freq_interval是以下一个或多个：1 =星期日2 =星期四4 =星期二8 =星期三16 =星期四32 =星期六64 =星期六
16（月）在每月的freq_interval天
32 ，相对）freq_interval是以下之一：1 =星期日2 =星期三3 =星期四4 =星期五5 =星期六6 =星期五7 =星期六8 =第9天=工作日10 =周末日
64（SQL Server代理服务启动时启动）freq_interval未使用（0）
128（当计算机空闲时运行）freq_interval未使用（0 ）
freq_subday_type
freq_subday_interval的单位。可以是以下值之一：
值说明（单位）
1在指定的时间
2秒
4分钟
8小时
freq_subday_interval
每次执行之间发生的freq_subday_type周期数的工作。
freq_relative_interval
当freq_interval发生在每个月，如果freq_interval为32（每月相对）。可以是以下值之一：
0 = freq_relative_interval未使用
1 =首先
2 = Second
4 =第三个
8 =第四
16 =最后
freq_recurrence_factor / p>
计划执行作业之间的周数或月数。如果freq_type为8,16或32，则使用freq_recurrence_factor。如果此列包含0，则freq_recurrence_factor未使用。
I am trying to develop a scheduler- and calendar-dependent event application in C#, for which a crucial requirement is to represent recurring events in the database. What is the best way to represent recurring events in a database?
More Details:
While creating the event I am also sending invites to the certain users and the invitees should be allowed to login to the meeting only during the specified window(meeting duration) or may be decline the login when the invitee attempts to login say, 5 minutes before the scheduled start of the meeting.
The sysjobs, sysjobsschedule and sysschedules tables in SQL Server does a pretty good job of this. I wouldn't reinvent the wheel, I'd just copy their design.
Here are some of the important fields from sysschedules
freq_type
How frequently a job runs for this schedule.
1 = One time only
4 = Daily
8 = Weekly
16 = Monthly
32 = Monthly, relative to freq_interval
64 = Runs when the SQL Server Agent service starts
128 = Runs when the computer is idle
freq_interval
Days that the job is executed. Depends on the value of freq_type. The default value is 0, which indicates that freq_interval is unused. Value of freq_type Effect on freq_interval
1 (once) freq_interval is unused (0)
4 (daily) Every freq_interval days
8 (weekly) freq_interval is one or more of the following: 1 = Sunday 2 = Monday 4 = Tuesday 8 = Wednesday 16 = Thursday 32 = Friday 64 = Saturday
16 (monthly) On the freq_interval day of the month
32 (monthly, relative) freq_interval is one of the following: 1 = Sunday 2 = Monday 3 = Tuesday 4 = Wednesday 5 = Thursday 6 = Friday 7 = Saturday 8 = Day 9 = Weekday 10 = Weekend day
64 (starts when SQL Server Agent service starts) freq_interval is unused (0)
128 (runs when computer is idle) freq_interval is unused (0)
freq_subday_type
Units for the freq_subday_interval. Can be one of the following values: Value Description (unit)
1 At the specified time
2 Seconds
4 Minutes
8 Hours
freq_subday_interval
Number of freq_subday_type periods to occur between each execution of the job.
freq_relative_interval
When freq_interval occurs in each month, if freq_interval is 32 (monthly relative). Can be one of the following values:
0 = freq_relative_interval is unused
1 = First
2 = Second
4 = Third
8 = Fourth
16 = Last
freq_recurrence_factor
Number of weeks or months between the scheduled execution of a job. freq_recurrence_factor is used only if freq_type is 8, 16, or 32. If this column contains 0, freq_recurrence_factor is unused.
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