如何在跨越多天的计时表中获取当天的关闭时间

Question

假设我有以下 table 称为 Timing:

显然每一行代表特定日期的一个班次。

一天可以有多个不重叠的班次。

如果一个班次跨越第二天，它将在午夜拆分，后半部分将具有前半部分的父 ID（如您在第 24 和 31 行中所见）

我想查询离我的一天结束（下一次打烊时间）还有多少分钟。

例如，如果我在第 1 天，我的一天将在 第 2 天结束 - 2:00 AM（因为轮班从 天开始1 - 9:00，并在 天结束 2 - 2:00).

如果有间隙（比如周末左右），我必须小心。请注意没有第 3 天，因此下一个关闭时间将是 第 4 天 - 23:15（前提是您在第 3 天）。

我主要是在寻找 Linq 查询 (Timing.Where(x=> x.close_time< .... 等)。

但我认为它可能非常复杂，所以我可以接受原始 SQL 查询。

编辑：这是我到目前为止得到的：

    var localTime = DateTime.Now;
    var tomorrowDay = ((int)localTime.DayOfWeek + 7 + 1) % 7;

    Timing lastShift = Timings.Where(x =>
              ((int)x.DayOfWeek) == tomorrowDay && x.ParentId != null)
              .SingleOrDefault(); // Either it is tomorrow but starts today.

    if (lastShift != null)
    {
        return Convert.ToInt32((lastShift.CloseTime - localTime.TimeOfDay).TotalMinutes);
    }

    lastShift = Timings
              .Where(x => x.DayOfWeek == localTime.DayOfWeek && x.CloseTime >= localTime.TimeOfDay)
              .OrderByDescending(x => x.CloseTime)
              .Take(1).SingleOrDefault();

    return Convert.ToInt32((lastShift.CloseTime - localTime.TimeOfDay).TotalMinutes);

编辑:

感谢@Han，这里是与上面 table 相同的列表：

    var Timings = new []
    {
        new Timing(22, (DayOfWeek)0, new TimeSpan(9,45,0), new TimeSpan(11, 15,  0),null),
        new Timing(23, (DayOfWeek)0, new TimeSpan(13,  0,  0), new TimeSpan( 15,  0,  0), null),
        new Timing(24, (DayOfWeek)1, new TimeSpan( 9,  0,  0), new TimeSpan(23, 59, 59), null),
        new Timing(31, (DayOfWeek)2, new TimeSpan( 0,  0,  0), new TimeSpan( 2,  0,  0), 24),
        new Timing(25, (DayOfWeek)2, new TimeSpan(10,  0,  0), new TimeSpan(12,  0,  0), null),
        new Timing(26, (DayOfWeek)2, new TimeSpan(15,  0,  0), new TimeSpan(17,  0,  0), null),
        new Timing(28, (DayOfWeek)4, new TimeSpan( 9, 45,  0), new TimeSpan(23, 15,  0), null),
        new Timing(29, (DayOfWeek)5, new TimeSpan( 9, 45,  0), new TimeSpan(23, 15,  0), null),
        new Timing(30, (DayOfWeek)6, new TimeSpan( 9, 45,  0), new TimeSpan(23, 15,  0), null),
    };

class Timing
{
    public int Id {get; set;}
    public DayOfWeek DayOfWeek {get; set;}
    public TimeSpan OpenTime {get; set;}
    public TimeSpan CloseTime {get; set;}
    public int? ParentId {get; set;}
    
    public Timing(int id, DayOfWeek dow, TimeSpan openTime, TimeSpan closeTime, int? parentId)
    {
        this.Id = id;
        this.DayOfWeek = dow;
        this.OpenTime = openTime;
        this.CloseTime = closeTime;
        this.ParentId = parentId;
    }
}

Answer 1

我建议离开自己加入你的 table 以获得第二天的结束时间。我假设每一行都有零个或一个子行。我不使用 table 而是数组，但查询应该是相同的。我在 LINQPad 中编码。

void Main()
{
    var Timings = new []
    {
        new Timing(22, 0, new DateTime(2021,  9, 12,  9, 45,  0), new DateTime(2021,  9, 12, 11, 15,  0), null),
        new Timing(23, 0, new DateTime(2021,  9, 12, 13,  0,  0), new DateTime(2021,  9, 12, 15,  0,  0), null),
        new Timing(24, 1, new DateTime(2021,  9, 13,  9,  0,  0), new DateTime(2021,  9, 13, 23, 59, 59), null),
        new Timing(31, 2, new DateTime(2021,  9, 14,  0,  0,  0), new DateTime(2021,  9, 14,  2,  0,  0), 24),
        new Timing(25, 2, new DateTime(2021,  9, 14, 10,  0,  0), new DateTime(2021,  9, 14, 12,  0,  0), null),
        new Timing(26, 2, new DateTime(2021,  9, 14, 15,  0,  0), new DateTime(2021,  9, 14, 17,  0,  0), null),
        new Timing(28, 4, new DateTime(2021,  9, 16,  9, 45,  0), new DateTime(2021,  9, 16, 23, 15,  0), null),
        new Timing(29, 5, new DateTime(2021,  9, 17,  9, 45,  0), new DateTime(2021,  9, 17, 23, 15,  0), null),
        new Timing(30, 6, new DateTime(2021,  9, 18,  9, 45,  0), new DateTime(2021,  9, 18, 23, 15,  0), null),
    };
    
    var timingGroupedWithChildren = (
        from t1 in Timings.Where(x => x.ParentId == null) // parent rows only
        join t2 in Timings.Where(x => x.ParentId != null) // childr rows only
            on t1.Id equals t2.ParentId // left join parent's Id with child's ParentId
            into nextDay
        select new {t1, nextDay})
        .Dump() //unremark this line to get show the result in LINQPad
        ;
}

class Timing
{
    public int Id {get; set;}
    public int DayOfWeek {get; set;}
    public DateTime OpenTime {get; set;}
    public DateTime CloseTime {get; set;}
    public int? ParentId {get; set;}
    
    public Timing(int id, int dow, DateTime openTime, DateTime closeTime, int? parentId)
    {
        this.Id = id;
        this.DayOfWeek = dow;
        this.OpenTime = openTime;
        this.CloseTime = closeTime;
        this.ParentId = parentId;
    }
}

timingGroupedWithChildren 看起来像这样：

注意只有id = 24 有nextDay，其他行没有nextDay。有8个项目（左上角显示），但只详细显示了Id 23和24（其他行折叠保存space，因为我的屏幕不够大）。

现在很容易知道第二天的关门时间。第一种方法是这样的。

void Main()
{
    var Timings = new []
    {
        new Timing(22, 0, new DateTime(2021,  9, 12,  9, 45,  0), new DateTime(2021,  9, 12, 11, 15,  0), null),
        new Timing(23, 0, new DateTime(2021,  9, 12, 13,  0,  0), new DateTime(2021,  9, 12, 15,  0,  0), null),
        new Timing(24, 1, new DateTime(2021,  9, 13,  9,  0,  0), new DateTime(2021,  9, 13, 23, 59, 59), null),
        new Timing(31, 2, new DateTime(2021,  9, 14,  0,  0,  0), new DateTime(2021,  9, 14,  2,  0,  0), 24),
        new Timing(25, 2, new DateTime(2021,  9, 14, 10,  0,  0), new DateTime(2021,  9, 14, 12,  0,  0), null),
        new Timing(26, 2, new DateTime(2021,  9, 14, 15,  0,  0), new DateTime(2021,  9, 14, 17,  0,  0), null),
        new Timing(28, 4, new DateTime(2021,  9, 16,  9, 45,  0), new DateTime(2021,  9, 16, 23, 15,  0), null),
        new Timing(29, 5, new DateTime(2021,  9, 17,  9, 45,  0), new DateTime(2021,  9, 17, 23, 15,  0), null),
        new Timing(30, 6, new DateTime(2021,  9, 18,  9, 45,  0), new DateTime(2021,  9, 18, 23, 15,  0), null),
    };
    
    var timingGroupedWithChildren = (
        from t1 in Timings.Where(x => x.ParentId == null) // parent rows only
        join t2 in Timings.Where(x => x.ParentId != null) // childr rows only
            on t1.Id equals t2.ParentId // left join parent's Id with child's ParentId
            into nextDay
        select new {
            t1.Id,
            t1.DayOfWeek,
            t1.OpenTime,
            // if current row's next day is null, then use current row's CloseTime
            // otherwise use next day's CloseTime
            CloseTime = nextDay.Where(x => x.ParentId == t1.Id).Count() == 0 ? t1.CloseTime : nextDay.Where(x => x.ParentId == t1.Id).Single().CloseTime
        })
        //.Dump() //unremark this line to get show the result in LINQPad
        ;
    
    var myShift = timingGroupedWithChildren.Where(x => x.Id == 24).Single();
    var myWorkingHours = (myShift.CloseTime - myShift.OpenTime).TotalHours;
    Console.WriteLine($"Working hours = {myWorkingHours}");
}

class Timing
{
    public int Id {get; set;}
    public int DayOfWeek {get; set;}
    public DateTime OpenTime {get; set;}
    public DateTime CloseTime {get; set;}
    public int? ParentId {get; set;}
    
    public Timing(int id, int dow, DateTime openTime, DateTime closeTime, int? parentId)
    {
        this.Id = id;
        this.DayOfWeek = dow;
        this.OpenTime = openTime;
        this.CloseTime = closeTime;
        this.ParentId = parentId;
    }
}

您可以在下面的图片中看到，如果当前行有子项，我将替换为结束日期。但是我不使用实际数据库测试此查询（我使用的是数组）并且我不喜欢调用 nextDay.Where(x => ...).Count() 两次，因为 LINQ 中的某些方法，例如。 Count()，迭代所有行。它是用 Where(x => ...) 过滤的，但我什么也不能说，除非我看到调用此查询时执行的实际 SQL 语句。如果您在 SQL Management Studio 中打开 SQL Profiler 或使用 LINQPad SQL 翻译，您可以看到实际的语句。该按钮位于图片的顶部（结果 lambda 符号 SQL IL 树）。

另一种方法是获取子行并在从 SQL.

获取后执行 Count()

void Main()
{
    var Timings = new []
    {
        new Timing(22, 0, new DateTime(2021,  9, 12,  9, 45,  0), new DateTime(2021,  9, 12, 11, 15,  0), null),
        new Timing(23, 0, new DateTime(2021,  9, 12, 13,  0,  0), new DateTime(2021,  9, 12, 15,  0,  0), null),
        new Timing(24, 1, new DateTime(2021,  9, 13,  9,  0,  0), new DateTime(2021,  9, 13, 23, 59, 59), null),
        new Timing(31, 2, new DateTime(2021,  9, 14,  0,  0,  0), new DateTime(2021,  9, 14,  2,  0,  0), 24),
        new Timing(25, 2, new DateTime(2021,  9, 14, 10,  0,  0), new DateTime(2021,  9, 14, 12,  0,  0), null),
        new Timing(26, 2, new DateTime(2021,  9, 14, 15,  0,  0), new DateTime(2021,  9, 14, 17,  0,  0), null),
        new Timing(28, 4, new DateTime(2021,  9, 16,  9, 45,  0), new DateTime(2021,  9, 16, 23, 15,  0), null),
        new Timing(29, 5, new DateTime(2021,  9, 17,  9, 45,  0), new DateTime(2021,  9, 17, 23, 15,  0), null),
        new Timing(30, 6, new DateTime(2021,  9, 18,  9, 45,  0), new DateTime(2021,  9, 18, 23, 15,  0), null),
    };
    
    var timingGroupedWithChildren = (
        from t1 in Timings.Where(x => x.ParentId == null) // parent rows only
        join t2 in Timings.Where(x => x.ParentId != null) // childr rows only
            on t1.Id equals t2.ParentId // left join parent's Id with child's ParentId
            into nextDay
        select new {
            t1.Id,
            t1.DayOfWeek,
            t1.OpenTime,
            t1.CloseTime,
            NextDay = nextDay
        })
        //.Dump() //unremark this line to get show the result in LINQPad
        ;
        
    var myShift = timingGroupedWithChildren.Where(x => x.Id == 24).Single();
    var myWorkingHours = ((myShift.NextDay.Count() == 0 ? myShift.CloseTime : myShift.NextDay.Single().CloseTime) - myShift.OpenTime).TotalHours;
    Console.WriteLine($"Working hours = {myWorkingHours}");
}

class Timing
{
    public int Id {get; set;}
    public int DayOfWeek {get; set;}
    public DateTime OpenTime {get; set;}
    public DateTime CloseTime {get; set;}
    public int? ParentId {get; set;}
    
    public Timing(int id, int dow, DateTime openTime, DateTime closeTime, int? parentId)
    {
        this.Id = id;
        this.DayOfWeek = dow;
        this.OpenTime = openTime;
        this.CloseTime = closeTime;
        this.ParentId = parentId;
    }
}

您可以看到只有 Id = 24 的行有 NextDay（如图 #1）。

如何在跨越多天的计时表中获取当天的关闭时间

How to get the closing time of day in timing schedule that spans multiple days

c#

sql

ef-core-5.0