使用这些桌子阻塞房间

Posted 2023-05-09

【中文标题】使用这些桌子阻塞房间

【英文标题】：Room blocking using these table

【发布时间】：2016-02-10 14:38:54

【问题描述】：

我有以下这些数据库表

预订表

.---------------+-----------------+------------------+---------------.
| reservationID |    guestID      |     check_in     |   check_out   |
+---------------+-----------------+------------------+---------------+
|       1       |       1         |     2016-02-13   |  2016-02-14   |
|       2       |       1         |     2016-02-16   |  2016-02-19   |
.---------------+-----------------+------------------+---------------.

房间预订表

.---------------+-----------------+------------------+---------------+--------------.
| roomReserveID | reservationID   |  date_scheduled  | roomDetailsNo |   roomNo     |
+---------------+-----------------+------------------+---------------+--------------+
|       1       |       1         |     2016-02-13   |      2        |      101     |
|       2       |       1         |     2016-02-13   |      2        |      101     |
|       3       |       4         |     2016-02-16   |      6        |      116     |
|       4       |       4         |     2016-02-17   |      6        |      116     |
|       5       |       4         |     2016-02-18   |      6        |      116     |
|       6       |       4         |     2016-02-19   |      6        |      116     |
.---------------+-----------------+------------------+---------------+--------------.

房间数

.---------+-----------------+-----------.
| RoomID  | RoomDetailsNo   |room_status| 
+---------+-----------------+-----------+
|   101   |         1       | reserved  |
|   102   |         3       | available |
|   103   |         3       | available |
|   104   |         2       | reserved  |
|   105   |         2       | available |
|   116   |         6       | reserved  |
.---------+-----------------+-----------.

房间详情表

.----------------+----------------+---------.
| RoomDetailsNo  |   room_type    |room_rate|
+----------------+----------------+---------+
|        1       | Standard Room  |  3000   |
|        2       | Deluxe Room    |  3500   |
|        3       | Family Room    |  4000   |
|        4       | Standard Quad  |  4000   |
|        5       | Deluxe Quad    |  4000   |
|        6       | Dormitory Room |  4000   |
.----------------+----------------+---------.

在下面我有当前查询，我正在使用它来阻止 2016-02-13 到 2016-02-14 的房间 101 和 2016-02-16 到 2016-02-19 的房间 116。

$roomBlock = mysqli_query($conn, "
SELECT COUNT(r.roomDetailsNo) AS available_rooms, rd.roomDetailsNo, rd.room_type, rd.room_rate,

    r.room_status, rd.room_pax, rd.max_cap, rd.inclusive, rd.description, rd.image_name
    FROM rooms AS r
    LEFT JOIN roomdetails AS rd
    ON r.roomDetailsNo = rd.roomDetailsNo
    WHERE r.roomNo  = (SELECT rr.roomNo
                        FROM roomreservation AS rr
                        WHERE rr.date_scheduled NOT BETWEEN '$newCheckIn' AND '$newCheckOut')
    GROUP BY room_type;
") OR die("Error in roomBlocking:".mysqli_error($conn));

变量 $newCheckIn 和 $newCheckOut 来自用户，它们是他们想要的入住和退房日期。如何不显示在特定日期预订的房间？

当我尝试这个查询时，结果是： roomBlocking 中的错误：子查询返回超过 1 行

【问题讨论】：

正如错误所说 - 您试图在只允许返回 ONE 值但子查询返回 MULTIPLE 行的上下文中使用子查询。换句话说，不要使用=，使用IN

那么删除日期内不可用房间的正确查询应该是什么？

【参考方案1】：

您的子查询返回超过 1 个预期结果，因此您应该使用 where r.roomNo in, instesd of where r.roomNo =