随机调度

Question

我在我的数据库如下表：

TBL1
PK
客户端ID
ScheduleDay
Time1Start
Time1Stop
Time2Start
Time2Stop
Time3Start
Time3Stop
状态

下面是一些样本数据

ID ClientID ScheduleDay Time1Start Time1Stop Time2Start Time2Stop Time3Start Time3Stop  
-- -------- ----------- ---------- --------- ---------- --------- ---------- --------- 
1  3  Sunday  0000  0800  1000  1300  NULL  NULL 
2  3  Monday  0000  2359  NULL  NULL  NULL  NULL 
3  3  Tuesday  1000  1200  1330  1700  1900  2200 
4  3  Wednesday 0000  0800  NULL  NULL  NULL  NULL 
5  3  Thursday 0800  1200  NULL  NULL  NULL  NULL 
6  3  Friday  0400  0800  0900  1600  NULL  NULL 

时间字段是CHAR（4）因为我存储在军事格式的时间。

我需要完成的是这个;对于任何给定的ClientID，将一条或多条记录插入日程表中，并且记录的时间值位于tbl1的时间范围内。例如，在周二安排ClientID 3，安排的时间可能是1120.

如果需要插入多个记录，安排的时间应该不超过一个小时。

任何和所有帮助表示赞赏！

Answer 1

这是我最好的猜测，你想要做什么。 CTE的前两部分实际上只是把事情变成一种类似于FlyingStreudel所建议的形式。理想情况下，您应该更改数据库以匹配该格式，而不是通过CTE执行此操作。这将使这个过程更加简单，并且对数据完整性也更好。

接下来，我只是以小时为单位获得不同的开始时间。如果你不能使用CTE（你没有提到你使用的SQL Server版本），你可以通过加入数字表来实现。

最后，我使用RAND函数和ROW_NUMBER随机抓取其中一个开始时间。你会想为RAND（）设置一个好的种子值。

;WITH TimesAsTimes AS 
(
    SELECT 
     ScheduleDay, 
     CAST(SUBSTRING(T1.Time1Start, 1, 2) + ':' + SUBSTRING(T1.Time1Start, 3, 2) AS TIME) AS time_start, 
     CAST(SUBSTRING(T1.Time1Stop, 1, 2) + ':' + SUBSTRING(T1.Time1Stop, 3, 2) AS TIME) AS time_stop 
    FROM 
     tbl1 T1 
    WHERE 
     T1.Time1Start IS NOT NULL 
    UNION ALL 
    SELECT 
     ScheduleDay, 
     CAST(SUBSTRING(T2.Time2Start, 1, 2) + ':' + SUBSTRING(T2.Time2Start, 3, 2) AS TIME) AS time_start, 
     CAST(SUBSTRING(T2.Time2Stop, 1, 2) + ':' + SUBSTRING(T2.Time2Stop, 3, 2) AS TIME) AS time_stop 
    FROM 
     tbl1 T2 
    WHERE 
     T2.Time2Start IS NOT NULL 
    UNION ALL 
    SELECT 
     ScheduleDay, 
     CAST(SUBSTRING(T3.Time3Start, 1, 2) + ':' + SUBSTRING(T3.Time3Start, 3, 2) AS TIME) AS time_start, 
     CAST(SUBSTRING(T3.Time3Stop, 1, 2) + ':' + SUBSTRING(T3.Time3Stop, 3, 2) AS TIME) AS time_stop 
    FROM 
     tbl1 T3 
    WHERE 
     T3.Time3Start IS NOT NULL 
), 
PossibleTimeStarts AS 
(
    SELECT 
     ScheduleDay, 
     time_start, 
     time_stop 
    FROM 
     TimesAsTimes TAT 
    UNION ALL 
    SELECT 
     ScheduleDay, 
     DATEADD(hh, 1, time_start) AS time_start, 
     time_stop 
    FROM 
     PossibleTimeStarts PTS 
    WHERE 
     DATEADD(hh, 1, time_start) <= DATEADD(hh, -1, PTS.time_stop) 
), 
PossibleTimesWithRowNums AS 
(
    SELECT 
     ScheduleDay, 
     time_start, 
     ROW_NUMBER() OVER(PARTITION BY ScheduleDay ORDER BY ScheduleDay, time_start) AS row_num, 
     COUNT(*) OVER(PARTITION BY ScheduleDay) AS num_rows 
    FROM 
     PossibleTimeStarts 
) 
SELECT 
    * 
FROM 
    PossibleTimesWithRowNums 
WHERE 
    row_num = FLOOR(RAND() * num_rows) + 1 

Answer 2

首先，你可能想尝试像

tbl_sched_avail 
PK id INT 
FK client_id INT 
day INT (1-7) 
avail_start varchar(4) 
avail_end varchar(4) 

架构这样你不仅限于有限数量的时间围栏的。

至于检查的时间表可用性 - 至于对实际插入我需要更多地了解在数据库中的表记录代码

CREATE PROCEDURE sp_ins_sched 
@start_time varchar(4), 
@end_time varchar(4), 
@client_id INT, 
@day INT 
AS 
BEGIN 

    DECLARE @can_create BIT 
    SET @can_create = 0 
    DECLARE @fence_start INT 
    DECLARE @fence_end INT 

    --IS DESIRED TIME WITHIN FENCE FOR CLIENT 
    DECLARE c CURSOR FOR 
    SELECT avail_start, avail_end FROM tbl_sched_avail 
    WHERE client_id = @client_id 
    AND day = @day 

    OPEN c 

    FETCH NEXT FROM c 
    INTO @fence_start, @fence_end 

    WHILE @@FETCH_STATUS = 0 AND @can_create = 0 
    BEGIN 
     IF @start_time >= @fence_start AND @start_time < @fence_end 
      AND @end_time > @fence_start AND <= @fence_end 
      SET @can_create = 1 

     FETCH NEXT FROM c 
     INTO @fence_start, @fence_end 
    END 

    CLOSE c 
    DEALLOCATE c 

    IF @can_create = 1 
    BEGIN 
     --insert your schedule here 
    END 

END 

。