Design skills for order delivery status table of grocery shopping system in MySQL

The order delivery status table design skills of the grocery shopping system in MySQL require specific code examples

In the grocery shopping system, the order delivery status is a very important piece of information . It records the current status of the order, including delivered, undelivered, being delivered, etc. Properly designing the order delivery status table can improve the efficiency and scalability of the system. This article will introduce some techniques for designing order delivery status tables in MySQL and provide specific code examples.

1. Choose the appropriate data type

When designing the order delivery status table, we need to choose the appropriate data type to store the order status. A common way is to use enumeration types. For example, we can define an enumeration type named delivery_status, which contains three statuses: delivered, not delivered, and being delivered. The specific code is as follows:

CREATE TABLE orders (

id INT PRIMARY KEY AUTO_INCREMENT,
delivery_status ENUM('已配送', '未配送', '正在配送')

);

Using enumeration types can ensure that only predefined status values ​​can be stored, improving data integrity. .

2. Add index

In order to speed up the query, we can add an index to the order delivery status column. Adding an index allows the system to find orders that match a specific shipping status more quickly. The specific code is as follows:

CREATE INDEX idx_delivery_status ON orders (delivery_status);

3. Use triggers to update order status

During the order delivery process, Order status needs to be constantly updated. To automate this process we can use triggers. Triggers automatically modify an order's delivery status when a delivery is completed or canceled. The specific code is as follows:

DELIMITER //
CREATE TRIGGER update_delivery_status
AFTER INSERT ON delivery_log
FOR EACH ROW
BEGIN

IF NEW.status = '已配送' THEN
    UPDATE orders SET delivery_status = '已配送' WHERE id = NEW.order_id;
ELSEIF NEW.status = '取消配送' THEN
    UPDATE orders SET delivery_status = '未配送' WHERE id = NEW.order_id;
END IF;

END //
DELIMITER ;

In the above code, we assume that there is a table named delivery_log used to record delivery logs. When a new delivery log is inserted, the trigger updates the order's delivery status based on the delivery status.

4. Query orders with a specific delivery status

In order to query orders with a specific delivery status, we can use the SELECT statement combined with the WHERE clause to filter orders that meet the conditions. For example, to query for orders that have been delivered, you can use the following code:

SELECT * FROM orders WHERE delivery_status = 'Delivered';

By adding the appropriate index, this query can be quickly Return results.

Summary

When designing the order delivery status table, we need to choose an appropriate data type to store the order status and add an index to speed up the query. You can improve the efficiency of your system by using triggers to automatically update order fulfillment status. Finally, we can use the SELECT statement to query orders with a specific delivery status.

The above are specific code examples about the order delivery status table design skills of the grocery shopping system in MySQL. Hope this helps!

The above is the detailed content of Design skills for order delivery status table of grocery shopping system in MySQL. For more information, please follow other related articles on the PHP Chinese website!