Home Database Mysql Tutorial How to use MySQL to create a user table for the grocery shopping system

How to use MySQL to create a user table for the grocery shopping system

Nov 01, 2023 am 09:43 AM
mysql Establish user table

How to use MySQL to create a user table for the grocery shopping system

How to use MySQL to build a user table for a grocery shopping system

The user table is an important part of any grocery shopping system. It is used to store the user’s basic information and Login credentials. In this article, we will introduce how to use a MySQL database to build a simple but practical user table and provide specific code examples.

  1. Create database and user table

First, we need to create a database to store the user table. In MySQL, you can use the following statement to create a database named "grocery_system":

CREATE DATABASE grocery_system;

Next, we can use the following statement to create a database named "users" User table:

USE grocery_system;

CREATE TABLE users (
id INT AUTO_INCREMENT PRIMARY KEY,
username VARCHAR(255) NOT NULL,
password VARCHAR(255 ) NOT NULL,
email VARCHAR(255) NOT NULL,
created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
last_login TIMESTAMP
);

  1. Set the fields of the user table

The user table includes the following fields:

  • id: user ID, primary key, automatically incremented.
  • username: Username, cannot be repeated.
  • password: Login password, which should usually be stored encrypted.
  • email: User email, used to retrieve passwords and send shopping information.
  • created_at: User creation time, the default value is the current time.
  • last_login: The user’s last login time, the initial value is empty.
  1. Insert and modify user information

Next, we can use the INSERT statement to insert new user information into the user table. Here is an example:

INSERT INTO users (username, password, email) VALUES ('user1', 'password1', 'user1@example.com');

This will send the user Insert a record into the table, containing the new user information with the user name "user1", password "password1", and email address "user1@example.com".

If you need to modify user information, you can use the UPDATE statement. For example, to modify the email address of user "user1" to "user1_updated@example.com", you can use the following statement:

UPDATE users SET email = 'user1_updated@example.com' WHERE username = 'user1';

  1. Query user information

In the grocery shopping system, we usually need to find user information based on the user name or email. The following are some sample query statements:

-- Query user information based on username
SELECT * FROM users WHERE username = 'user1';

-- Query user information based on email address
SELECT * FROM users WHERE email = 'user1@example.com';

-- Query all user information
SELECT * FROM users;

  1. Delete user information

If you need to delete user information, you can use the DELETE statement. For example, to delete user information with the user name "user1", you can use the following statement:

DELETE FROM users WHERE username = 'user1';

The above is a simple but practical user table Examples of creation and usage. Of course, in an actual grocery shopping system, the user table may include more fields and functions, such as user address, mobile phone number, etc. This is just a basic starting point, you can expand and optimize according to actual needs.

I hope this article can help you understand how to use MySQL to build a user table for the grocery shopping system.

The above is the detailed content of How to use MySQL to create a user table for the grocery shopping system. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot Article Tags

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

PHP's big data structure processing skills PHP's big data structure processing skills May 08, 2024 am 10:24 AM

PHP's big data structure processing skills

How to optimize MySQL query performance in PHP? How to optimize MySQL query performance in PHP? Jun 03, 2024 pm 08:11 PM

How to optimize MySQL query performance in PHP?

How to use MySQL backup and restore in PHP? How to use MySQL backup and restore in PHP? Jun 03, 2024 pm 12:19 PM

How to use MySQL backup and restore in PHP?

What are the application scenarios of Java enumeration types in databases? What are the application scenarios of Java enumeration types in databases? May 05, 2024 am 09:06 AM

What are the application scenarios of Java enumeration types in databases?

How to insert data into a MySQL table using PHP? How to insert data into a MySQL table using PHP? Jun 02, 2024 pm 02:26 PM

How to insert data into a MySQL table using PHP?

How to fix mysql_native_password not loaded errors on MySQL 8.4 How to fix mysql_native_password not loaded errors on MySQL 8.4 Dec 09, 2024 am 11:42 AM

How to fix mysql_native_password not loaded errors on MySQL 8.4

How to use MySQL stored procedures in PHP? How to use MySQL stored procedures in PHP? Jun 02, 2024 pm 02:13 PM

How to use MySQL stored procedures in PHP?

Performance optimization strategies for PHP array paging Performance optimization strategies for PHP array paging May 02, 2024 am 09:27 AM

Performance optimization strategies for PHP array paging

See all articles