How to use Go language to develop the business time management function of the ordering system

How to use Go language to develop the business hours management function of the ordering system

Introduction:
Developing an ordering system, in addition to basic ordering and checkout In addition to functions, business hours management in different time periods also needs to be considered. In some restaurants, breakfast, lunch, and dinner have different menus and prices, so the system needs to be able to accurately control the menu display and price calculation at different time periods. This article will introduce how to use Go language to develop the business hours management function of the ordering system, and provide specific code examples for reference.

1. Demand analysis
When developing the business hours management function of the ordering system, we need to consider the following demand points:

1. Be able to customize different time periods Business hours rules;
2. In different time periods, display and price calculation should be limited to menus in that time period;
3. When users select menus, they need to be reminded of information that is not currently in the business hours. ;
4. The system should be able to automatically determine whether the current time is within business hours, and make corresponding displays and calculations based on the situation.

2. Design Plan
Based on the above demand analysis, we can design the following business hours management function implementation plan:

1. Use Go language to write a time period management The structure of the controller is used to define business rules for different time periods;
2. A function is needed to determine whether the current time is within a certain time period;
3. Define a menu structure, including dishes Name, price and other related information;
4. Define a global menu list variable to store all menu information;
5. When displaying the order page, determine which menus to display based on the current time. And calculate the price;
6. Provides a function for setting menus and price rules for different time periods.

3. Code Implementation
Next, we will give specific code implementation examples, please refer to the following sample code:

package main

import (
    "fmt"
    "time"
)

type TimeRange struct {
    StartTime time.Time
    EndTime   time.Time
}

type MenuItem struct {
    Name     string
    Price    float64
    TimeRule TimeRange
}

var menuList []MenuItem

func isTimeInRange(t time.Time, tr TimeRange) bool {
    return t.After(tr.StartTime) && t.Before(tr.EndTime)
}

func showMenuByTime() {
    currentTime := time.Now()

    for _, item := range menuList {
        if isTimeInRange(currentTime, item.TimeRule) {
            fmt.Println(item.Name, item.Price)
        }
    }
}

func main() {
    // 初始化菜单列表
    menuList = []MenuItem{
        {Name: "早餐A", Price: 20.5, TimeRule: TimeRange{
            StartTime: time.Date(2022, time.January, 1, 8, 0, 0, 0, time.UTC),
            EndTime:   time.Date(2022, time.January, 1, 10, 0, 0, 0, time.UTC),
        }},
        {Name: "午餐A", Price: 30.0, TimeRule: TimeRange{
            StartTime: time.Date(2022, time.January, 1, 11, 0, 0, 0, time.UTC),
            EndTime:   time.Date(2022, time.January, 1, 14, 0, 0, 0, time.UTC),
        }},
        {Name: "晚餐A", Price: 40.0, TimeRule: TimeRange{
            StartTime: time.Date(2022, time.January, 1, 18, 0, 0, 0, time.UTC),
            EndTime:   time.Date(2022, time.January, 1, 22, 0, 0, 0, time.UTC),
        }},
    }

    showMenuByTime()
}

In the above code examples, we use TimeRangeStructure to define business rules for different time periods. MenuItemThe structure contains the name, price, time rules and other information of the dish. menuList is a global variable used to store all menu information.

isTimeInRangeThe function is used to determine whether the current time is within the specified time range. showMenuByTimeThe function displays the corresponding menu based on the current time.

In the main function, we initialize the menu list and call the showMenuByTime function to display the menu in the current time period.

4. Summary
Through the above implementation code, we can see that using Go language to develop the business time management function of the ordering system is not complicated. By defining the time period manager and menu structure, and combining the time judgment function and menu display logic, we can realize the business hours management capabilities of the ordering system in different time periods.

In actual development, we can further expand according to actual needs, such as adding and setting price rules for different time periods, providing an operation interface to facilitate management, and other functions. I hope that the solutions and code examples provided in this article can be helpful to students who develop ordering systems.

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