Go language development of door-to-door cooking system: How to implement the dish classification function?

Go language development of door-to-door cooking system: How to implement the dish classification function?

Introduction: With the improvement of people's living standards, eating out has become a common way of life. However, due to busy lives and busy work, many people have gradually begun to choose to order takeout or home cooking. In order to better meet user needs, it is particularly necessary to develop a door-to-door cooking system. This article will introduce in detail how to use Go language to implement the dish classification function, and give specific code examples.

1. Requirements Analysis

To realize the dish classification function, we first need to clarify the requirements and determine the functions and goals of the system. In the door-to-door cooking system, the dish classification function mainly has the following requirements:

1. It can classify dishes according to different categories, such as Sichuan cuisine, Cantonese cuisine, Hunan cuisine, etc.;
2. You can easily add, delete and modify dish categories;
3. can query all dishes under the dish category.

Based on the above requirements, we can start working on system design and code implementation.

2. System design

1. Database design

In order to be able to store dish classification information and dish information, we need to design corresponding database tables. The following are several commonly used tables and fields:

• Dish category table (menu_category): id, name;
• Dish table (dish): id, name, category_id, price.

2. Code implementation

First, we need to establish the dish classification structure and dish structure, as shown below:

type MenuCategory struct {
    ID   int
    Name string
}

type Dish struct {
    ID         int
    Name       string
    CategoryID int
    Price      float64
}

Next , we need to implement the functions of adding, deleting and modifying dish classifications. Taking adding a dish category as an example, the code is as follows:

func AddMenuCategory(name string) error {
    // 将菜品分类信息插入数据库
    _, err := db.Exec("INSERT INTO menu_category (name) VALUES (?)", name)
    if err != nil {
        return err
    }
    return nil
}

We can use a similar method to implement the functions of deleting and modifying dish categories.

Finally, we need to implement the function of querying all dishes under the dish category. The code is as follows:

func GetDishesByCategory(categoryID int) ([]Dish, error) {
    var dishes []Dish

    // 从数据库中查询菜品信息
    rows, err := db.Query("SELECT id, name, category_id, price FROM dish WHERE category_id = ?", categoryID)
    if err != nil {
        return nil, err
    }
    defer rows.Close()

    // 遍历结果集，构建菜品切片
    for rows.Next() {
        var dish Dish
        err := rows.Scan(&dish.ID, &dish.Name, &dish.CategoryID, &dish.Price)
        if err != nil {
            return nil, err
        }
        dishes = append(dishes, dish)
    }
    return dishes, nil
}

3. Summary

Through the above system design and code implementation, we have successfully implemented the dish classification function. Using Go language for development can not only improve development efficiency, but also ensure the stability and maintainability of the code. Of course, in addition to the dish classification function, there are many other functions that need to be implemented in the door-to-door cooking system, such as user login, dish ordering, order management, etc. I hope that the introduction in this article can help readers better master the methods and techniques of developing a door-to-door cooking system in Go language.

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