彩票走势图

dhtmlxScheduler是一个类似于Google日历的JavaScript日程安排控件，日历事件通过Ajax动态加载，支持通过拖放功能调整事件日期和时间，事件可以按天，周，月三个种视图显示。

在本教程中，我们将使用两个强大的工具：DHTMLX Scheduler库和Angular框架来创建一个全面的酒店客房预订应用程序。在上文中（点击这里回顾>>）我们为大家介绍了提供保存数据中的数据加载、CRUD操作实现等，本文将继续介绍服务器配置。

Step 5 – 服务器配置

现在让我们继续为应用程序设置Node.js服务器，本教程使用Express框架和MySQL作为数据存储。

添加依赖项和安装模块

您应该设置MySQL服务器，或者可以使用其他服务，例如免费MySQL托管。

添加express、mysql和date-format-lite模块：

$ npm install express mysql date-format-lite

server.js被指定为上面的输入点，现在让我们在项目的根目录下创建server文件夹，并添加server.js文件，代码如下：

const express = require('express'); // use Express
const app = express(); // create application
const port = 3000; // port for listening
const cors = require('cors');
app.use(cors()); // enable CORS for all routes

// MySQL will be used for db access and util to promisify queries
const util = require('util');
const mysql = require('mysql');

// use your own parameters for database
const mysqlConfig = {
'connectionLimit': 10,
'host': 'localhost',
'user': 'root',
'password': '',
'database': 'room_reservation_node'
};

app.use(express.json()); // Enable JSON body parsing
// return static pages from the './public' directory
app.use(express.static(__dirname + '/public'));

// start server
app.listen(port, () = {
console.log('Server is running on port ' + port + '...');
});

const router = require('./router');

// open connection to mysql
const connectionPool = mysql.createPool(mysqlConfig);
connectionPool.query = util.promisify(connectionPool.query);

// add listeners to basic CRUD requests
const DatabaseHandler = require('./databaseHandler');
const databaseHandler = new DatabaseHandler(connectionPool);
router.setRoutes(app, '/data', databaseHandler);

然后打开package.json文件夹，将start语句替换为：

"scripts": {
"ng": "ng",
"start": "concurrently \"node server/server.js\" \"ng serve\"",
…

我们将使用concurrent包来同时启动服务器和客户端应用程序，因此添加concurrent模块：

$ npm install concurrently

准备数据库

让我们将Scheduler连接到数据库，并定义在其中读取和写入项的方法。

• 创建数据库：

首先我们需要一个数据库来工作，您可以使用自己喜欢的mysql-client或通过控制台创建数据库。

要使用mysql-client创建数据库，打开它并执行下面的代码，创建预订表：

CREATE TABLE `reservations` (
`id` bigint(20) unsigned AUTO_INCREMENT,
`start_date` datetime NOT NULL,
`end_date` datetime NOT NULL,
`text` varchar(255) DEFAULT NULL,
`room` varchar(255) DEFAULT NULL,
`booking_status` varchar(255) DEFAULT NULL,
`is_paid` BOOLEAN DEFAULT NULL CHECK (is_paid IN (0, 1)),
PRIMARY KEY (`id`)
) DEFAULT CHARSET=utf8;

让我们添加一些测试数据：

INSERT INTO `reservations` VALUES (2, '2023-08-01', '2023-08-11', 'RSV2023-08-01ABC124', 3, 4, true);
INSERT INTO `reservations` VALUES (3, '2023-08-07', '2023-08-17', 'RSV2023-08-07ABC126', 5, 3, true);
INSERT INTO `reservations` VALUES (4, '2023-08-04', '2023-08-16', 'RSV2023-08-04ABC125', 7, 4, false);
INSERT INTO `reservations` VALUES (13, '2023-07-28', '2023-08-14', 'RSV2023-07-28ABC123', 1, 4, true);
INSERT INTO `reservations` VALUES (14, '2023-08-14', '2023-08-27', 'RSV2023-08-14ABC129', 1, 3, false);
INSERT INTO `reservations` VALUES (15, '2023-08-19', '2023-08-29', 'new booking', 4, 1, false);
INSERT INTO `reservations` VALUES (16, '2023-08-24', '2023-08-31', 'new booking', 11, 1, false);
INSERT INTO `reservations` VALUES (17, '2023-08-17', '2023-08-26', 'RSV2023-08-17ABC135', 6, 2, false);
INSERT INTO `reservations` VALUES (18, '2023-08-18', '2023-08-31', 'RSV2023-08-18ABC139', 9, 2, false);
INSERT INTO `reservations` VALUES (19, '2023-08-02', '2023-08-12', 'RSV2023-08-02ABC127', 10, 4, true);
INSERT INTO `reservations` VALUES (20, '2023-08-12', '2023-08-21', 'RSV2023-08-12ABC130', 10, 3, false);

创建房间表：

CREATE TABLE `rooms` (
`id` bigint(20) unsigned AUTO_INCREMENT,
`value` varchar(255) DEFAULT NULL,
`label` varchar(255) DEFAULT NULL,
`type` varchar(255) DEFAULT NULL,
`cleaning_status` varchar(255) DEFAULT NULL,
PRIMARY KEY (`id`)
) DEFAULT CHARSET=utf8;

添加一些测试数据：

INSERT INTO `rooms` VALUES ('1', '1', '101', '1', '1');
INSERT INTO `rooms` VALUES ('2', '2', '102', '1', '3');
INSERT INTO `rooms` VALUES ('3', '3', '103', '1', '2');
INSERT INTO `rooms` VALUES ('4', '4', '104', '1', '1');
INSERT INTO `rooms` VALUES ('5', '5', '105', '2', '1');
INSERT INTO `rooms` VALUES ('6', '6', '201', '2', '2');
INSERT INTO `rooms` VALUES ('7', '7', '202', '2', '1');
INSERT INTO `rooms` VALUES ('8', '8', '203', '3', '3');
INSERT INTO `rooms` VALUES ('9', '9', '204', '3', '3');
INSERT INTO `rooms` VALUES ('10', '10', '301', '4', '2');
INSERT INTO `rooms` VALUES ('11', '11', '302', '4', '2');
INSERT INTO `rooms` VALUES ('12', '12', '303', '1', '2');

创建roomTypes表：

CREATE TABLE `roomTypes` (
`id` bigint(20) unsigned AUTO_INCREMENT,
`value` varchar(255) DEFAULT NULL,
`label` varchar(255) DEFAULT NULL,
PRIMARY KEY (`id`)
) DEFAULT CHARSET=utf8;

添加一些测试数据：

INSERT INTO `roomTypes` VALUES ('1', '1', '1 bed');
INSERT INTO `roomTypes` VALUES ('2', '2', '2 bed');
INSERT INTO `roomTypes` VALUES ('3', '3', '3 bed');
INSERT INTO `roomTypes` VALUES ('4', '4', '4 bed');

创建cleaningStatuses表：

CREATE TABLE `cleaningStatuses` (
`id` bigint(20) unsigned AUTO_INCREMENT,
`value` varchar(255) DEFAULT NULL,
`label` varchar(255) DEFAULT NULL,
`color` varchar(255) DEFAULT NULL,
PRIMARY KEY (`id`)
) DEFAULT CHARSET=utf8;

添加一些测试数据：

INSERT INTO `cleaningStatuses` VALUES ('1', '1', 'Ready', '#43a047');
INSERT INTO `cleaningStatuses` VALUES ('2', '2', 'Dirty', '#e53935');
INSERT INTO `cleaningStatuses` VALUES ('3', '3', 'Clean up', '#ffb300');

创建bookingStatuses表：

CREATE TABLE `bookingStatuses` (
`id` bigint(20) unsigned AUTO_INCREMENT,
`value` varchar(255) DEFAULT NULL,
`label` varchar(255) DEFAULT NULL,
PRIMARY KEY (`id`)
) DEFAULT CHARSET=utf8;

添加一些测试数据：

INSERT INTO `bookingStatuses` VALUES ('1', '1', 'New');
INSERT INTO `bookingStatuses` VALUES ('2', '2', 'Confirmed');
INSERT INTO `bookingStatuses` VALUES ('3', '3', 'Arrived');
INSERT INTO `bookingStatuses` VALUES ('4', '4', 'Checked Out');

• 实现数据访问：

所有的读/写逻辑都将在一个名为DatabaseHandler的单独模块中定义，它将使用mysql连接并在指定的表中执行简单的CRUD操作：读取所有项，插入新项，更新或删除现有项。为此创建databaseHandler.js文件，并将以下代码添加到其中：

require('date-format-lite'); // add date format

class DatabaseHandler {
constructor(connection, table) {
this._db = connection;
this.table = 'reservations';
}

/// ↓↓↓ reservations handler ↓↓↓
// get reservations, use dynamic loading if parameters sent
async getAllReservations(params) {
let query = 'SELECT * FROM ??';
let queryParams = [
this.table
];

let result = await this._db.query(query, queryParams);

result.forEach((entry) = {
// format date and time
entry.start_date = entry.start_date.format('YYYY-MM-DD hh:mm');
entry.end_date = entry.end_date.format('YYYY-MM-DD hh:mm');
});

return result;
}

// create new reservation
async insert(data) {
let result = await this._db.query(
'INSERT INTO ?? (`start_date`, `end_date`, `text`, `room`, `booking_status`, `is_paid`) VALUES (?,?,?,?,?,?)',
[this.table, data.start_date, data.end_date, data.text, data.room, data.booking_status, data.is_paid]);

return {
action: 'inserted',
tid: result.insertId
}
}

// update reservation
async update(id, data) {
await this._db.query(
'UPDATE ?? SET `start_date` = ?, `end_date` = ?, `text` = ?, `room` = ?, `booking_status` = ?, `is_paid` = ? WHERE id = ?',
[this.table, data.start_date, data.end_date, data.text, data.room, data.booking_status, data.is_paid, id]);

return {
action: 'updated'
}
}

// delete reservation
async delete(id) {
await this._db.query(
'DELETE FROM ?? WHERE `id`=? ;',
[this.table, id]);

return {
action: 'deleted'
}
}
/// ↑↑↑ reservations handler ↑↑↑

/// ↓↓↓ room cleanup status handler ↓↓↓
// get rooms
async getAllRooms(params) {
let query = 'SELECT * FROM ??';
let queryParams = [
'rooms'
];

let result = await this._db.query(query, queryParams);

return result;
}

// update room cleanup status
async updateRoomCleaningStatus(id, data) {
await this._db.query(
'UPDATE ?? SET `value` = ?, `label` = ?, `type` = ?, `cleaning_status` = ? WHERE id = ?',
['rooms', data.key, data.label, data.type, data.cleaning_status, id]);

return {
action: 'updated'
}
}
/// ↑↑↑ room cleanup status handler ↑↑↑

/// ↓↓↓ get room types ↓↓↓
async getRoomTypes(params) {
let query = 'SELECT * FROM ??';
let queryParams = [
'roomTypes'
];

let result = await this._db.query(query, queryParams);

return result;
}
/// ↑↑↑ get room types ↑↑↑

/// ↓↓↓ get cleaning statuses ↓↓↓
async getCleaningStatuses(params) {
let query = 'SELECT * FROM ??';
let queryParams = [
'cleaningStatuses'
];

let result = await this._db.query(query, queryParams);

return result;
}
/// ↑↑↑ get cleaning statuses ↑↑↑

/// ↓↓↓ get booking statuses ↓↓↓
async getBookingStatuses(params) {
let query = 'SELECT * FROM ??';
let queryParams = [
'bookingStatuses'
];

let result = await this._db.query(query, queryParams);

return result;
}
/// ↑↑↑ get booking statuses ↑↑↑
}

module.exports = DatabaseHandler;

路由

然后需要设置路由，以便放置在页面上的调度器可以访问存储。为此创建另一个helper模块，并将其命名为router.js：

function callMethod (method) {
return async (req, res) = {
let result;

try {
result = await method(req, res);
} catch (e) {
result = {
action: 'error',
message: e.message
}
}

res.send(result);
}
};

module.exports = {
setRoutes (app, prefix, databaseHandler) {
/// ↓↓↓ reservations router ↓↓↓
app.get(`${prefix}/reservations`, callMethod((req) = {
return databaseHandler.getAllReservations(req.query);
}));

app.post(`${prefix}/reservations`, callMethod((req) = {
return databaseHandler.insert(req.body);
}));

app.put(`${prefix}/reservations/:id`, callMethod((req) = {
return databaseHandler.update(req.params.id, req.body);
}));

app.delete(`${prefix}/reservations/:id`, callMethod((req) = {
return databaseHandler.delete(req.params.id);
}));
/// ↑↑↑ reservations router ↑↑↑

/// ↓↓↓ rooms router ↓↓↓
app.get(`${prefix}/collections/rooms`, callMethod((req) = {
return databaseHandler.getAllRooms(req.query);
}));

app.put(`${prefix}/collections/rooms/:id`, callMethod((req) = {
return databaseHandler.updateRoomCleaningStatus(req.params.id, req.body);
}));
/// ↑↑↑ rooms router ↑↑↑

/// ↓↓↓ room types router ↓↓↓
app.get(`${prefix}/collections/roomTypes`, callMethod((req) = {
return databaseHandler.getRoomTypes(req.query);
}));
/// ↑↑↑ room types router ↑↑↑

/// ↓↓↓ cleaning statuses router ↓↓↓
app.get(`${prefix}/collections/cleaningStatuses`, callMethod((req) = {
return databaseHandler.getCleaningStatuses(req.query);
}));
/// ↑↑↑ cleaning statuses router ↑↑↑

/// ↓↓↓ booking statuses router ↓↓↓
app.get(`${prefix}/collections/bookingStatuses`, callMethod((req) = {
return databaseHandler.getBookingStatuses(req.query);
}));
/// ↑↑↑ booking statuses router ↑↑↑
}
};

它所做的就是设置应用程序来侦听调度器可以发送的请求url，并调用存储的适当方法。请注意，所有方法都包装在try-catch块中，以便能够捕获任何错误并向客户机返回适当的错误响应。

还要注意，异常消息是直接写入API响应的。这在开发过程中非常方便，但在生产环境中，对客户端隐藏这些消息可能是一个好主意，因为到达那里的原始mysql异常可能包含敏感数据。

现在如果您打开应用程序页面，可以看到一个带有预订的调度程序。可以在调度程序中创建、删除和修改项，即使重新加载页面，您所做的任何更改也将保留。