Database
Mysql Tutorial
Detailed explanation of Mysql operations such as adding users and authorization
Detailed explanation of Mysql operations such as adding users and authorization
Add users, create new databases, user authorization, delete users, and change passwords in MySQL (note that each line is followed by ; to indicate the end of a command statement):
1. Create a new user
登录MYSQL： @>mysql -u root -p @>密码
Create user:
mysql> insert into mysql.user(Host,User,Password) values("localhost","test",password("1234"));Note: "localhost" here means that the user can only log in locally and cannot log in remotely on another machine. If you want to log in remotely, change "localhost" to "%", which means you can log in from any computer. You can also specify a machine that can log in remotely.
Then log in:
mysql>exit; @>mysql -u test -p @>输入密码 mysql>登录成功
2. Authorize the user
Authorization format: grant permission on database.* to username@login host identified by "password ";
Log in to MYSQL (with ROOT permissions), log in as ROOT here:
@>mysql -u root -p @>密码
First create a database (testDB) for the user:
mysql>create database testDB;
Authorize the test user to have all permissions on the testDB database (all permissions on a certain database):
mysql>grant all privileges on testDB.* to test@localhost identified by '1234'; mysql>flush privileges;//刷新系统权限表
Format: grant permissions on database.* to username@login host identified by "password";
If you want to specify some permissions to a user, you can write like this:
mysql>grant select,update on testDB.* to test@localhost identified by '1234'; mysql>flush privileges; //刷新系统权限表
Authorize the test user to have certain permissions on all databases:
mysql>grant select,delete,update,create,drop on . to test@"%" identified by "1234";
//The test user has select, delete, update, create, drop permissions on all databases.
//@"%" indicates authorization for all non-local hosts, excluding localhost. (The localhost address is set to 127.0.0.1. If it is set to a real local address, I don’t know if it is possible. There is no verification.)
//Authorize localhost: Add a grant all privileges on testDB.* to test @localhost identified by '1234'; That's it.
3. Delete users
@>mysql -u root -p @>密码 mysql>Delete FROM user Where User='test' and Host='localhost'; mysql>flush privileges; mysql>drop database testDB; //删除用户的数据库
Delete accounts and permissions:
>drop user 用户名@'%'; >drop user 用户名@ localhost;
4.Change the password of the specified user
@>mysql -u root -p @>密码 mysql>update mysql.user set password=password('新密码') where User="test" and Host="localhost"; mysql>flush privileges;
5.List all databases
mysql>show database;
6.Switch database
mysql>use '数据库名';
7.List all tables
mysql>show tables;
8.Display data table structure
mysql>describe 表名;
9.Delete database and data table
mysql>drop database 数据库名; mysql>drop table 数据表名;
The above is the detailed content of Detailed explanation of Mysql operations such as adding users and authorization. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
MySQL: An Introduction to the World's Most Popular Database
Apr 12, 2025 am 12:18 AM
MySQL is an open source relational database management system, mainly used to store and retrieve data quickly and reliably. Its working principle includes client requests, query resolution, execution of queries and return results. Examples of usage include creating tables, inserting and querying data, and advanced features such as JOIN operations. Common errors involve SQL syntax, data types, and permissions, and optimization suggestions include the use of indexes, optimized queries, and partitioning of tables.
MySQL's Place: Databases and Programming
Apr 13, 2025 am 12:18 AM
MySQL's position in databases and programming is very important. It is an open source relational database management system that is widely used in various application scenarios. 1) MySQL provides efficient data storage, organization and retrieval functions, supporting Web, mobile and enterprise-level systems. 2) It uses a client-server architecture, supports multiple storage engines and index optimization. 3) Basic usages include creating tables and inserting data, and advanced usages involve multi-table JOINs and complex queries. 4) Frequently asked questions such as SQL syntax errors and performance issues can be debugged through the EXPLAIN command and slow query log. 5) Performance optimization methods include rational use of indexes, optimized query and use of caches. Best practices include using transactions and PreparedStatemen
Why Use MySQL? Benefits and Advantages
Apr 12, 2025 am 12:17 AM
MySQL is chosen for its performance, reliability, ease of use, and community support. 1.MySQL provides efficient data storage and retrieval functions, supporting multiple data types and advanced query operations. 2. Adopt client-server architecture and multiple storage engines to support transaction and query optimization. 3. Easy to use, supports a variety of operating systems and programming languages. 4. Have strong community support and provide rich resources and solutions.
How to connect to the database of apache
Apr 13, 2025 pm 01:03 PM
Apache connects to a database requires the following steps: Install the database driver. Configure the web.xml file to create a connection pool. Create a JDBC data source and specify the connection settings. Use the JDBC API to access the database from Java code, including getting connections, creating statements, binding parameters, executing queries or updates, and processing results.
How to start mysql by docker
Apr 15, 2025 pm 12:09 PM
The process of starting MySQL in Docker consists of the following steps: Pull the MySQL image to create and start the container, set the root user password, and map the port verification connection Create the database and the user grants all permissions to the database
MySQL's Role: Databases in Web Applications
Apr 17, 2025 am 12:23 AM
The main role of MySQL in web applications is to store and manage data. 1.MySQL efficiently processes user information, product catalogs, transaction records and other data. 2. Through SQL query, developers can extract information from the database to generate dynamic content. 3.MySQL works based on the client-server model to ensure acceptable query speed.
Laravel Introduction Example
Apr 18, 2025 pm 12:45 PM
Laravel is a PHP framework for easy building of web applications. It provides a range of powerful features including: Installation: Install the Laravel CLI globally with Composer and create applications in the project directory. Routing: Define the relationship between the URL and the handler in routes/web.php. View: Create a view in resources/views to render the application's interface. Database Integration: Provides out-of-the-box integration with databases such as MySQL and uses migration to create and modify tables. Model and Controller: The model represents the database entity and the controller processes HTTP requests.
How to install mysql in centos7
Apr 14, 2025 pm 08:30 PM
The key to installing MySQL elegantly is to add the official MySQL repository. The specific steps are as follows: Download the MySQL official GPG key to prevent phishing attacks. Add MySQL repository file: rpm -Uvh https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm Update yum repository cache: yum update installation MySQL: yum install mysql-server startup MySQL service: systemctl start mysqld set up booting
