Availability of hotel rooms

Hello good afternoon / afternoon / night, what happened is that I have an already functioning reservation system. I have these tables.

The table of the rooms.

CREATE TABLE `room` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `num_room` int(11) NOT NULL,
  `typeroom_id` int(11) NOT NULL,
  `estado_room` varchar(45) NOT NULL,
  `piso_room` int(11) NOT NULL,
  `precio` decimal(10,2) DEFAULT NULL,
  `grouproom_id` int(11) DEFAULT NULL,
  `created_at` timestamp NULL DEFAULT NULL,
  `updated_at` timestamp NULL DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `typeroom_id_idx` (`typeroom_id`),
  KEY `grouproom_id_idx` (`grouproom_id`),
  CONSTRAINT `grouproom_id` FOREIGN KEY (`grouproom_id`) REFERENCES `grouproom` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
  CONSTRAINT `typeroom_id` FOREIGN KEY (`typeroom_id`) REFERENCES `typeroom` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=74 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

The reservation table

CREATE TABLE `reservas` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `recepcions_id` int(11) NOT NULL,
  `estatus_id` int(11) NOT NULL,
  `agencia_id` int(11) NOT NULL,
  `fuentes_id` int(11) NOT NULL,
  `room_id` int(11) NOT NULL,
  `typeroom_id` int(11) NOT NULL,
  `fe_reserva` date NOT NULL,
  `fe_in` date NOT NULL,
  `fe_out` date NOT NULL,
  `reserva_noches` int(11) NOT NULL,
  `reserva_adultos` int(11) NOT NULL,
  `reserva_ninos` int(11) NOT NULL,
  `regimen_id` int(11) NOT NULL,
  `re_cliente` varchar(100) NOT NULL,
  `psugerido` decimal(10,2) NOT NULL,
  `prhabitacion` decimal(10,2) NOT NULL,
  `total` decimal(10,2) NOT NULL,
  `precio` decimal(10,2) NOT NULL,
  `formpago` varchar(255) NOT NULL,
  `color` varchar(50) NOT NULL,
  `created_at` timestamp NULL DEFAULT NULL,
  `updated_at` timestamp NULL DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `estatus_id_idx` (`estatus_id`),
  KEY `agenica_id_idx` (`agencia_id`),
  KEY `fuentes_id_idx` (`fuentes_id`),
  KEY `regimen_id_idx` (`regimen_id`),
  KEY `room_id_idx` (`room_id`),
  KEY `typerooms_id_idx` (`typeroom_id`),
  KEY `recepcions_id_idx` (`recepcions_id`),
  KEY `room_price_id_idx` (`prhabitacion`),
  CONSTRAINT `agencia_id` FOREIGN KEY (`agencia_id`) REFERENCES `agencia` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
  CONSTRAINT `estatus_id` FOREIGN KEY (`estatus_id`) REFERENCES `status` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
  CONSTRAINT `fuentes_id` FOREIGN KEY (`fuentes_id`) REFERENCES `fuentes` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
  CONSTRAINT `recepcions_id` FOREIGN KEY (`recepcions_id`) REFERENCES `users` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
  CONSTRAINT `regimen_id` FOREIGN KEY (`regimen_id`) REFERENCES `regimen` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
  CONSTRAINT `room_id` FOREIGN KEY (`room_id`) REFERENCES `room` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
  CONSTRAINT `typerooms_id` FOREIGN KEY (`typeroom_id`) REFERENCES `typeroom` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=28 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

If reservations are stored in the database via the reservation form, the occupied rooms should not be displayed to me as they can not reserve the same room for different people on the same date

Enter image description here

In my database, I have already done a little test, for example, I have made a query where I would look for the availability

select r.id,r.typeroom_id,r.precio,r.num_room
from room as r left join typeroom as tr on r.id = tr.id
where estado_room = 'Disponible'
     AND NOT EXISTS(
         SELECT 1 FROM Reservas b WHERE b.room_id = r.id 
           AND ('7/12/2019' BETWEEN b.fe_in
           AND b.fe_out OR '8/12/2019' BETWEEN b.fe_in 
           AND b.fe_out OR ('7/12/2019'<= b.fe_in AND '8/12/2019' >= b.fe_out)))
order by r.num_room;

and if I throw a result that I hope I can pass on to a script now to skip the rooms, I more or less have the idea of ​​using moment.js, but I have not found the solution, if someone has already worked on a similar project i have may lead to find the solution i would appreciate

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– Physical protection (24/7)
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Data Center: USA, Los Angeles

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CPU: Intel Xeon E3-1230
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I have a client with DAG setup on servers for 2016 and 2017. I understand that their use is most likely for DR purposes. What is a bit unclear to me (and I can not find any information about it) is how connected they are (if at all). Does the application layer in a DAG / AG setup still only establish a connection to the underlying AG (and not to the DAG itself)? I tried to connect to the DAG via SSMS, but I can not. Is this intended? Is anything actually connecting to the DAG itself or is it just there to manage the synchronization between AGs? All info very much appreciated guys (and girls) 🙂

Greetings,

Glenn

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