將唯一時間跨度插入表

Question

我有包含3列的表：某些事件和事件ID的開始和結束日期。

我需要插入新行並以某種方式驗證開始和結束日期之間的時間跨度不會與此事件的其他時間跨度相交。

例如我有兩個事件時間跨度：從1.08.2016到9.08.2016和從10.08.2016到17.08.2016。因此，我無法插入任何開始和結束日期介於1.08.2016和17.08.2016之間的新行

如何使用JavaScript，C＃或T-SQL進行此驗證？

Answer 1

DECLARE @DataX TABLE (
    EventID   INT IDENTITY 
    ,StartDate  DATE 
    ,EndDate  DATE 
    ) 

INSERT INTO @DataX VALUES 
    ('2016-08-01','2016-08-09') 
    ,('2016-08-10','2016-08-17') 

DECLARE @NewStart   DATE = '2016-08-05' 
     ,@NewEnd   DATE = '2016-08-18' 
     ,@NewStartValid  TINYINT 
     ,@NewEndValid  TINYINT 

;WITH Validate 
    AS (
     SELECT SUM(CASE WHEN @NewStart BETWEEN StartDate AND EndDate THEN 1 ELSE 0 END) AS VStart, 
       SUM(CASE WHEN @NewEnd BETWEEN StartDate AND EndDate THEN 1 ELSE 0 END) AS VEnd 
      FROM @DataX 
     ) 

SELECT @NewStartValid = VStart, @NewEndValid = VEnd 
    FROM Validate 

SELECT @NewStartValid, @NewEndValid 

有效是0，無效是> 0本實施例表明在開始日期是日期範圍之一內（結果：1）和結束日期不是（結果：0）。

Answer 2

這是我對C＃的解決方案。用下面的控制做到這一點，你需要一個表格（窗口）：

1. X1「的DataGridView」（表格看與數據的列）

2. X1「的NumericUpDown」（要選擇事件ID）

3. X2 「的DateTimePicker」（該選擇起始和結束日期）

4. X1 「按鈕」（爲事件添加到表）

這裏有代碼：

// This is your table with data in three columns 
DataTable events = new DataTable(); 

// When the program starts 
public Form1() 
{ 
    InitializeComponent(); 

    // Add the columns to the table 
    events.Columns.Add("ID", typeof(int)); 
    events.Columns.Add("Start Date", typeof(DateTime)); 
    events.Columns.Add("End Date", typeof(DateTime)); 

    // Set data and formats 
    dataGridView1.DataSource = events; 
    dataGridView1.Columns[1].DefaultCellStyle.Format = "dd/MM/yyyy"; // The way the date is shown 
    dataGridView1.Columns[2].DefaultCellStyle.Format = "dd/MM/yyyy"; // Ex. 27-07-2016 
} 

// Add The row containing information about the event 
private void btnAdd_Click(object sender, EventArgs e) 
{ 
    // Weather or not the row should be added 
    bool addRow = true; 

    // Skip this if no rows are added yet 
    foreach (DataRow row in events.Rows) 
    { 
     // Row id and dates 
     int eventId = (int)row[0]; 
     DateTime rowStartDate = (DateTime)row[1]; 
     DateTime rowEndDate = (DateTime)row[2]; 

     // If new start date lies inside the timespan of an existing event 
     bool newStartDateBetween = rowStartDate.Date <= dateTimePicker1.Value.Date && rowEndDate.Date >= dateTimePicker1.Value.Date; 

     // If new end date lies inside the timespan of an existing event 
     bool newEndDateBetween = rowStartDate.Date <= dateTimePicker2.Value.Date && rowEndDate.Date >= dateTimePicker2.Value.Date; 

     // If any of these statements are true, show the error and dont add the new row 
     if (eventId == numericUpDown1.Value || newStartDateBetween || newEndDateBetween || dateTimePicker2.Value.Date < dateTimePicker1.Value.Date) 
     { 
      if (eventId == numericUpDown1.Value) 
       MessageBox.Show("Event ID already taken!"); 

      if (newStartDateBetween) 
       MessageBox.Show("The starting date is within the timespan of event ID: " + row[0] + "!"); 

      if (newEndDateBetween) 
       MessageBox.Show("The ending date is within the timespan of event ID: " + row[0] + "!"); 

      if (dateTimePicker2.Value.Date < dateTimePicker1.Value.Date) 
       MessageBox.Show("The ending date is before the starting date!"); 

      // Dont add the row 
      addRow = false; 
      break; 
     } 
    } 

    // Add the row if no errors 
    if (addRow) 
     events.Rows.Add((int)numericUpDown1.Value, dateTimePicker1.Value, dateTimePicker2.Value); 
} 

希望這有助於。

Answer 3

下面將返回任何conficts

Declare @Table table (EventID int,StartDate Date,EndDate Date) 
Insert into @Table values 
(1,'2016-08-01','2016-08-09'), 
(2,'2016-08-10','2016-08-17') 

Declare @StartDate Date = '2016-08-05' 
Declare @EndDate Date = '2016-08-18' 

Select * 
     ,ValidStart = IIF(@StartDate Between StartDate and EndDate,0,1) 
     ,ValidEnd = IIF(@EndDate Between StartDate and EndDate,0,1) 
From @Table 
Where @StartDate Between StartDate and EndDate 
    or @EndDate Between StartDate and EndDate 

返回

EventID StartDate EndDate  ValidStart ValidEnd 
1  2016-08-01 2016-08-09 0   1