預訂檢查空房情況

Question

我正在創建一個預訂房間的系統。 我需要找出日期范圍內的可用房間數量。

該房間應在結帳日期可用。

到目前為止，我只能找到日期范圍內的訂單，但即使是那些也不能正常工作。

這項工作 2020-06-27 - 2020-07-05

這不起作用 2020-06-28 - 2020-07-05

目標是找出日期范圍內的免費房間數量，然后提供訂購服務。

我在這里閱讀了很多主題，但我沒有提出解決方案。

我使用 PHP 和 MySQL

-- phpMyAdmin SQL Dump
-- version 4.7.4
-- https://www.phpmyadmin.net/
--
-- Počítač: 127.0.0.1
-- Vytvořeno: Sob 27. čen 2020, 10:24
-- Verze serveru: 10.1.28-MariaDB
-- Verze PHP: 7.2.1

SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET AUTOCOMMIT = 0;
START TRANSACTION;
SET time_zone = "+00:00";


/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8mb4 */;

--
-- Databáze: `rezervace`
--

-- --------------------------------------------------------

--
-- Struktura tabulky `booking_orders`
--

CREATE TABLE `booking_orders` (
  `id` int(11) NOT NULL,
  `number` int(11) NOT NULL,
  `checkin` date NOT NULL,
  `checkout` date NOT NULL,
  `first_name` varchar(255) COLLATE utf8_czech_ci NOT NULL,
  `last_name` varchar(255) COLLATE utf8_czech_ci NOT NULL,
  `email` varchar(255) COLLATE utf8_czech_ci NOT NULL,
  `phone` varchar(20) COLLATE utf8_czech_ci NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_czech_ci;

--
-- Vypisuji data pro tabulku `booking_orders`
--

INSERT INTO `booking_orders` (`id`, `number`, `checkin`, `checkout`, `first_name`, `last_name`, `email`, `phone`) VALUES
(74, 0, '2020-06-27', '2020-06-28', '', '', '', ''),
(75, 0, '2020-06-27', '2020-06-29', '', '', '', ''),
(76, 0, '2020-06-27', '2020-07-01', '', '', '', ''),
(77, 0, '2020-06-28', '2020-06-29', '', '', '', '');

-- --------------------------------------------------------

--
-- Struktura tabulky `booking_order_room`
--

CREATE TABLE `booking_order_room` (
  `id` int(4) NOT NULL,
  `order_id` int(4) NOT NULL,
  `room_id` int(4) NOT NULL,
  `product_name` varchar(255) COLLATE utf8_czech_ci NOT NULL,
  `quantity` int(3) NOT NULL,
  `person` int(2) NOT NULL,
  `price` varchar(10) COLLATE utf8_czech_ci NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_czech_ci;

--
-- Vypisuji data pro tabulku `booking_order_room`
--

INSERT INTO `booking_order_room` (`id`, `order_id`, `room_id`, `product_name`, `quantity`, `person`, `price`) VALUES
(81, 74, 7, 'Standard', 1, 1, '50'),
(82, 75, 7, 'Standard', 1, 1, '50'),
(83, 76, 7, 'Standard', 1, 1, '50'),
(84, 77, 7, 'Standard', 1, 1, '50');

-- --------------------------------------------------------

--
-- Struktura tabulky `booking_rooms`
--

CREATE TABLE `booking_rooms` (
  `id` int(11) NOT NULL,
  `name` varchar(255) COLLATE utf8_czech_ci NOT NULL,
  `quantity` int(3) NOT NULL,
  `input` varchar(255) COLLATE utf8_czech_ci NOT NULL,
  `price` int(5) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_czech_ci;

--
-- Vypisuji data pro tabulku `booking_rooms`
--

INSERT INTO `booking_rooms` (`id`, `name`, `quantity`, `input`, `price`) VALUES
(7, 'Standard', 2, 'standard1', 50),
(8, 'Deluxe', 4, 'deluxe2', 100);

--
-- Klíče pro exportované tabulky
--

--
-- Klíče pro tabulku `booking_orders`
--
ALTER TABLE `booking_orders`
  ADD PRIMARY KEY (`id`);

--
-- Klíče pro tabulku `booking_order_room`
--
ALTER TABLE `booking_order_room`
  ADD PRIMARY KEY (`id`);

--
-- Klíče pro tabulku `booking_rooms`
--
ALTER TABLE `booking_rooms`
  ADD PRIMARY KEY (`id`);

--
-- AUTO_INCREMENT pro tabulky
--

--
-- AUTO_INCREMENT pro tabulku `booking_orders`
--
ALTER TABLE `booking_orders`
  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=79;

--
-- AUTO_INCREMENT pro tabulku `booking_order_room`
--
ALTER TABLE `booking_order_room`
  MODIFY `id` int(4) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=85;

--
-- AUTO_INCREMENT pro tabulku `booking_rooms`
--
ALTER TABLE `booking_rooms`
  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=9;
COMMIT;

http://sqlfiddle.com/#!9/bfbabe/1

SELECT checkin, checkout, r.name as name, SUM(i.quantity) as qty 
FROM booking_orders o
LEFT JOIN booking_order_room i on o.id = i.order_id
LEFT JOIN booking_rooms r on i.room_id = r.id
WHERE (checkin >= '2020-06-28' and checkout <= '2020-07-05')
OR (checkin <= '2020-06-28' and checkout >= '2020-07-05')
GROUP BY i.room_id, o.id

Answer 1

我附上了我最終使用的解決方案。 它可能會以不同的方式完成。

DROP TABLE IF EXISTS t1;

CREATE TEMPORARY TABLE t1 as (
SELECT r.name as name, r.id, sum(i.quantity) as qty
FROM booking_orders o
LEFT JOIN booking_order_room i on o.id = i.order_id
LEFT JOIN booking_rooms r on i.room_id = r.id
where
(checkin<'2020-07-17' and checkout>='2020-07-17') -- overlap at the end
OR (checkin<='2020-07-15' and checkout>'2020-07-15') -- overlap at the start
OR (checkin>='2020-07-15' and checkout<='2020-07-17') -- complete overlap
GROUP BY r.id
);

SELECT br.name as name, br.quantity as quantity, br.input as input, br. price as price, t1.qty 
FROM booking_rooms br
LEFT JOIN t1 ON t1.id = br.room_id
ORDER BY br.name DESC