Implementation method of dish classification function in food ordering system developed with Go language

Go language development method to implement the dish classification function in the ordering system

Overview:
With the rise of the takeout industry, the ordering system has become the mainstay of the catering industry an essential part of. Among them, dish classification is an important function in the ordering system, which can help users find the required dishes quickly and conveniently. This article will introduce how to implement the dish classification function in the ordering system using Go language, and provide specific code examples.

I. Database design
First, you need to design a database model to store dish information. You can create two tables, one is the menu table, which is used to store basic information of the dishes, including dish ID, name, price, etc.; the other is the dish classification table (category), which is used to store the information of the dish classification. , including category ID, name, etc. A one-to-many relationship can be established between the two tables, that is, multiple dishes belong to one category.

II. How to implement the dish classification function
The following are the steps and sample codes for using the Go language to implement the dish classification function:

1. In the Go language, first import the database-related Packages such as "database/sql" and "github.com/go-sql-driver/mysql".
2. Create a database connection and open the database connection. The sample code is as follows:

  db, err := sql.Open("mysql", "username:password@tcp(127.0.0.1:3306)/database_name")
  if err != nil {
      log.Fatal(err)
  }
  defer db.Close()

3. Write a function to query the database to obtain dish classification information. The sample code is as follows:

  func GetCategories() ([]Category, error) {
      var categories []Category
      rows, err := db.Query("SELECT id, name FROM category")
      if err != nil {
          return nil, err
      }
      defer rows.Close()

      for rows.Next() {
          var c Category
          if err := rows.Scan(&c.ID, &c.Name); err != nil {
              return nil, err
          }
          categories = append(categories, c)
      }
      
      return categories, nil
  }

4. Write a function to query the database to obtain dish information under a certain category. The sample code is as follows:

  func GetMenuByCategory(categoryID int) ([]Menu, error) {
      var menu []Menu
      rows, err := db.Query("SELECT id, name, price FROM menu WHERE category_id = ?", categoryID)
      if err != nil {
          return nil, err
      }
      defer rows.Close()
      
      for rows.Next() {
          var m Menu
          if err := rows.Scan(&m.ID, &m.Name, &m.Price); err != nil {
              return nil, err
          }
          menu = append(menu, m)
      }
      
      return menu, nil
  }

5. Call the above function in the main function to obtain and print the dish classification and related dish information. The sample code is as follows:

  func main() {
      categories, err := GetCategories()
      if err != nil {
          log.Fatal(err)
      }
      
      for _, c := range categories {
          fmt.Println("分类：" + c.Name)
          menu, err := GetMenuByCategory(c.ID)
          if err != nil {
              log.Fatal(err)
          }
          for _, m := range menu {
              fmt.Println("菜品：" + m.Name, "价格：" + strconv.Itoa(m.Price))
          }
          
          fmt.Println("--------------")
      }
  }

The above is the basic implementation method of using Go language to develop the dish classification function in the ordering system. Through the above steps, we can obtain and display the information of dish classification and related dishes from the database, and help users select the required dishes more quickly.

Summary:
This article introduces the implementation method of using Go language to develop the dish classification function in the ordering system, and provides detailed code examples. Through the introduction of this article, readers can learn how to connect to the database through Go language, query related information, and display the query results to the user in an appropriate way. Through the realization of the dish classification function, users can browse and select the required dishes more conveniently, which improves the user experience and the ease of use of the system.

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