Go language development of door-to-door cooking system: How to implement the order modification function?

Go language development of door-to-door cooking system: How to implement the order modification function?

With the improvement of living standards, people’s demand for takeout services has become more and more diverse. The door-to-door cooking system came into being, which provides customers with more personalized catering services. In such a system, order management is particularly important. This article will introduce how to use Go language to develop an order modification function to help the catering system provide better services.

1. Database design

First, we need to design the database table structure to store order information. A simple order table can contain the following fields:

type Order struct {
    ID      int       `db:"id"`
    UserID  int       `db:"user_id"`
    Status  string    `db:"status"`
    Items   []OrderItem
    // ...
}

type OrderItem struct {
    ID     int    `db:"id"`
    OrderID int   `db:"order_id"`
    Name   string `db:"name"`
    Price  int    `db:"price"`
    // ...
}

The order table contains basic information about the order, such as order number (ID), user number (UserID), order status (Status), etc. The order item table is used to store the dish information of the order. We use Go's struct tag to map table fields.

2. API design

Next, we need to design the API interface to handle order modifications. We can use the common RESTful style to design the interface. The following is an API example for modifying an order:

func updateOrder(c *gin.Context) {
    var order Order
    if err := c.ShouldBindJSON(&order); err != nil {
        c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
        return
    }

    // 检查订单是否存在

    // 更新订单信息

    // 返回更新后的订单信息
}

In this example, we use the Gin framework to handle the request. We first bind the JSON data of the order from the request to the order structure. Then, we can check whether the order exists, update the order information and return the updated order information as needed.

3. Implement logic

To implement the order modification function, we need to perform the following steps:

1) Check whether the order exists: you can pass the order ID queries the database to check if the order exists.

func getOrder(orderID int) (*Order, error) {
    var order Order
    err := db.Get(&order, "SELECT * FROM orders WHERE id = ?", orderID)
    if err != nil {
        if err == sql.ErrNoRows {
            return nil, fmt.Errorf("订单不存在")
        }
        return nil, err
    }
    return &order, nil
}

2) Update order information: Modify the relevant fields of the order as needed, and then update the database.

func updateOrderInfo(orderID int, updateData map[string]interface{}) error {
    // 构建更新语句
    updateStmt := "UPDATE orders SET"
    var params []interface{}
    for field, value := range updateData {
        updateStmt += fmt.Sprintf(" %s = ?,", field)
        params = append(params, value)
    }
    updateStmt = strings.TrimSuffix(updateStmt, ",")
    updateStmt += " WHERE id = ?"
    params = append(params, orderID)

    // 执行更新操作
    _, err := db.Exec(updateStmt, params...)
    if err != nil {
        return err
    }
    return nil
}

3) Return updated order information: Return updated order information as needed.

func getOrderInfo(orderID int) (*Order, error) {
    var order Order
    err := db.Get(&order, "SELECT * FROM orders WHERE id = ?", orderID)
    if err != nil {
        return nil, err
    }
    // 查询订单项信息
    err = db.Select(&order.Items, "SELECT * FROM order_items WHERE order_id = ?", orderID)
    if err != nil {
        return nil, err
    }
    return &order, nil
}

Using the above function, we can complete the modification of the order. Calling example:

func updateOrder(c *gin.Context) {
    var order Order
    if err := c.ShouldBindJSON(&order); err != nil {
        c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
        return
    }

    existingOrder, err := getOrder(order.ID)
    if err != nil {
        c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
        return
    }

    // 进行订单修改逻辑
    if order.Status != "" {
        existingOrder.Status = order.Status
    }
    // ...

    // 更新订单信息
    err = updateOrderInfo(order.ID, map[string]interface{}{
        "status": existingOrder.Status,
        // ...
    })
    if err != nil {
        c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
        return
    }

    // 返回更新后的订单信息
    updatedOrder, err := getOrderInfo(orderID)
    if err != nil {
        c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
        return
    }

    c.JSON(http.StatusOK, gin.H{"order": updatedOrder})
}

In summary, by designing the database table structure, implementing API interfaces and writing relevant business logic, we can easily implement the order modification function. I hope this article will be helpful for developing the order management function of the door-to-door cooking system in Go language. But this is just a simple example, and it needs to be appropriately modified and improved according to specific needs in actual development.

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