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POHow can I store and query schedule data?
 

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  1. POHow can I store and query schedule data?
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    <p>I'd like to allow my users to setup a schedule for their events. It could be a single day, or for convenience I'd like to allow them to specify a reoccurring event (similar to an Outlook appointment).</p> <p>For the single event it seems pretty easy (pseudo-code):</p> <p>Just have a DateOfEvent column that has the date on it.</p> <p>To grab future events:</p> <p>Select * from events where DateOfEvent > {DateTime.Now}</p> <p>But how could I store and query a reoccurring event? I don't need to do times, as I'd just store that seperately, and if they needed a different time I'd just have them create another event. So no: Every wednesday at 5 and thursdays at 3.</p> <p>Examples:</p> <p>Every mon, tues, wed, thu, fri, every week</p> <p>Every wed every week</p> <p>Every second tuesday of the month</p> <p><strong>What I used to query</strong></p> <p>I added a start and end dates. If the user selected a single date I set both start and end dates to the chosen date. I just had to modify the answer's code a bit.</p> <pre><code>DECLARE @StartDate SMALLDATETIME, @EndDate SMALLDATETIME; SELECT @StartDate = '20091129', @EndDate = '20101220'; SELECT d.CurrentDate, m.* FROM Calendar AS d INNER JOIN Meet AS m ON ( (d.CurrentDate = m.StartDate AND d.CurrentDate = m.EndDate) OR d.DaysOfTheMonth = m.DayOfTheMonth OR (d.DaysOfTheWeek = m.DayOfTheWeek AND COALESCE(m.WeekOfTheMonth, d.WeekOfTheMonth) = d.WeekOfTheMonth) OR d.DaysOfTheWeek IN (1,7) AND m.OnWeekends = 1 OR d.DaysOfTheWeek BETWEEN 2 AND 6 AND m.OnWeekDays = 1 ) -- now you can inner join to the event table -- to list the name, other details, etc. WHERE d.CurrentDate BETWEEN @StartDate AND @EndDate AND d.CurrentDate BETWEEN m.StartDate AND m.EndDate ORDER BY d.CurrentDate; GO </code></pre> <p>Filling in the Calandar table:</p> <pre><code>INSERT dbo.Calendar(CurrentDate, DaysOfTheMonth, DaysOfTheWeek, WeekOfTheMonth, IsWeekDay, Even) SELECT CurrentDate, DaysOfTheMonth, DaysOfTheWeek, WeekOfTheMonth = DATEDIFF(WEEK, DATEADD(DAY, 1-DaysOfTheMonth, CurrentDate), CurrentDate) + 1, CASE WHEN DaysOfTheWeek IN (1, 7) THEN 0 ELSE 1 END AS IsWeekDay, CASE WHEN w % 2 = 1 THEN 0 ELSE 1 END AS Even FROM ( SELECT CurrentDate, DaysOfTheMonth = DATEPART(DAY, CurrentDate), DaysOfTheWeek = DATEPART(WEEKDAY, CurrentDate), w = DATEPART(WEEK, CurrentDate) FROM ( SELECT CurrentDate = DATEADD(DAY, n-1, '20141001') FROM ( SELECT TOP 900 n = ROW_NUMBER() OVER (ORDER BY c1.[object_id]) FROM sys.all_columns AS c1 CROSS JOIN sys.all_columns AS c2 ORDER BY n ) AS x) AS y) AS z; </code></pre>
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    1. CONotes: INSERT dbo.Calendar(dt, dm, dw, mw, wd, even) SELECT dt, dm, power(2, dw-1), ... CASE WHEN w % 2 = 1 THEN 0 ELSE 1 END FROM ( SELECT ... w = DATEPART(WEEK, dt)
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    2. CONotes: SELECT d.dt, e.EventID FROM Calendar AS d INNER JOIN EventSchedule AS e ON d.dt = e.EventDate OR d.dm = e.DayOfMonth OR e.DayOfWeek & d.dw = d.dw AND COALESCE (e.WeekOfMonth, d.mw) = d.mw AND COALESCE (e.Even, d.even) = d.even OR d.dw IN (1, 7) AND e.Weekends = 1 OR d.dw BETWEEN 2 AND 6 AND e.Weekdays = 1
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    3. COThe above two comments let me do "Every other week" and condense the dayOfWeek from multiple records per day chosen down to one record per each event. I can post the rest of the code if anyone else is interested, otherwise you can probably figure it out from the above.
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