Question

在我尝试开发酒店预订系统时，我很好奇哪种方法最适合系统架构。目前，当客户在特定日期预订酒店房间时，我会获得酒店房间详细信息，客户详细信息和预订详细信息。

可用房间=总房间 - 预留房间

现在，我根据客户选择的特定日期保留的房间，使用查询检索该日期可用的房间。例如，客户从3 August 2016到6 August 2016预订房间。然后，我将在8月3日至8月6日期间从预订详情中检索日期。我将每天循环到这个SQL语句中。

Select * from bookingDetails where theDate between StartDate and EndDate and RoomType = 'Something'

然后我将把所设置的日期总结为预留的房间并获得总房间。客户选择日期

时将触发此声明

或者我应该再创建一个桌子作为可用房间，并将5年日历与总房间存储在一起。它将推断客户何时预订房间。

Answer 1

我认为你不需要任何其他表格您只需要查找所有预订的房间并将其排除在外：

Select * 
from tbl_Rooms
WHERE RoomType = 'Something' and 
    Room_ID not in (
        Select Room_ID 
        from bookingDetails 
        where theDate between @StartDate and @EndDate
    );

但是，该查询返回的房间仅在整个期间可用。以下是按天显示所有可用房间的查询（在255天范围内）：

;WITH Pass0 as (SELECT * FROM (VALUES (1),(1),(1),(1)) as A(C)),
  Pass1 as (select 1 as C from Pass0 as A, Pass0 as B),--16 rows
  Pass2 as (select 1 as C from Pass1 as A, Pass1 as B),--256 rows  
  Dates as (SELECT DATEADD(d,ROW_NUMBER() OVER(ORDER BY (SELECT NULL))-1,@StartDate) as AvailDate FROM Pass2)
SELECT d.AvailDate, r.* FROM tbl_Rooms as r
INNER JOIN Dates as d ON AvailDate < @EndDate
WHERE NOT EXISTS (SELECT 1 FROM bookingDetails as b WHERE b.theDate = d.AvailDate and b.Room_ID = r.Room_ID)
ORDER BY r.Room_Number, d.AvailDate;

酒店预订系统架构，提供可用房间效率

1 个答案: