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

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

Introduction:
With the development of the catering industry and the improvement of people's living standards, more and more More restaurants and catering companies are beginning to use ordering systems to improve work efficiency and customer experience. The customer management function in the ordering system is an important component, which can help restaurants manage customer information, reservations, orders, etc. This article will introduce how to use Go language to develop the customer management function of the ordering system and provide specific code examples.

1. Understand the needs
Before developing the customer management function, we need to understand the needs first. Generally speaking, the customer management function should include the following aspects:

1. Entry and query of customer information, including name, mobile phone number, ID number, etc.;
2. Customer reservation Functions, including date, time, number of people, etc.;
3. Customer order management, including ordering, checkout, refund, etc.;
4. Customer evaluation and feedback, including ratings, comments, etc.

2. Database design
Before we start writing code, we need to design a database to store customer information, reservations, orders and other data. You can use MySQL or other relational databases to store data, or you can choose to use NoSQL databases such as MongoDB. The following is a simple MySQL database design example:

CREATE TABLE customers (
id INT PRIMARY KEY AUTO_INCREMENT,
name VARCHAR(50),
phone VARCHAR(15),
id_card VARCHAR(18)
);

CREATE TABLE reservations (
id INT PRIMARY KEY AUTO_INCREMENT,
customer_id INT,
date DATE,
time TIME,
num_of_people INT,
FOREIGN KEY (customer_id) REFERENCES customers(id)
);

CREATE TABLE orders (
id INT PRIMARY KEY AUTO_INCREMENT,
customer_id INT,
date DATE,
dish_id INT,
quantity INT,
FOREIGN KEY (customer_id) REFERENCES customers(id),
FOREIGN KEY (dish_id) REFERENCES dishes(id)
);

3. Code Example
The following is a code example of the customer management function of the ordering system developed using Go language:

1. Define the customer structure and database connection:

type Customer struct {
   ID       int
   Name     string
   Phone    string
   IDCard   string
}

var db *sql.DB

func InitDB() {
   var err error
   db, err = sql.Open("mysql", "user:password@tcp(127.0.0.1:3306)/database")
   if err != nil {
      log.Fatal(err)
   }
}

2. 顾客信息的录入和查询：

func AddCustomer(c *Customer) error {
stmt, err := db.Prepare("INSERT INTO customers (name, phone, id_card) VALUES (?, ?, ?)")
if err != nil {

  return err

}
defer stmt.Close()

_, err = stmt.Exec(c.Name, c.Phone, c.IDCard)
if err != nil {

  return err

}

return nil
}

func GetCustomerByID(id int) (*Customer, error) {
row : = db.QueryRow("SELECT * FROM customers WHERE id = ?", id)

var customer Customer
err := row.Scan(&customer.ID, &customer.Name, &customer.Phone, &customer .IDCard)
if err != nil {

  if err == sql.ErrNoRows {
     return nil, nil
  }
  return nil, err

}

return &customer, nil
}

3. 顾客的预定管理：

type Reservation struct {
ID int
CustomerID int
Date time.Time
Time time.Time
NumOfPeople int
}

func AddReservation(r *Reservation) error {
stmt, err: = db.Prepare("INSERT INTO reservations (customer_id, date, time, num_of_people) VALUES (?, ?, ?, ?)")
if err != nil {

  return err

}
defer stmt.Close()

_, err = stmt.Exec(r.CustomerID, r.Date, r.Time, r.NumOfPeople)
if err != nil {

  return err

}

return nil
}

4. 顾客的订单管理：

type Order struct {
ID int
CustomerID int
Date time.Time
DishID int
Quantity int
}

func AddOrder(o *Order) error {
stmt, err := db.Prepare("INSERT INTO orders (customer_id, date, dish_id, quantity) VALUES (? , ?, ?, ?)")
if err != nil {

  return err

}
defer stmt.Close()

_, err = stmt.Exec(o .CustomerID, o.Date, o.DishID, o.Quantity)
if err != nil {

  return err

}

return nil
}

四、总结

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