search
HomeDatabaseMysql TutorialMySQL中用户授权/删除授权的方法_MySQL

bitsCN.com

用户授权方法

你可以通过发出GRANT语句增加新用户:

 

 代码如下 复制代码

 shell> mysql --user=root mysql

  mysql> GRANT ALL PRIVILEGES ON *.* TO monty@localhost

  IDENTIFIED BY 'something' WITH GRANT OPTION;

  mysql> GRANT ALL PRIVILEGES ON *.* TO monty@"%"

  IDENTIFIED BY 'something' WITH GRANT OPTION;

  mysql> GRANT RELOAD,PROCESS ON *.* TO admin@localhost;

  mysql> GRANT USAGE ON *.* TO dummy@localhost;

这些GRANT语句安装3个新用户

授权:

命令:

 代码如下 复制代码
GRANT privileges ON databasename.tablename TO 'username'@'host'

说明: privileges - 用户的操作权限,如SELECT , INSERT , UPDATE 等(详细列表见该文最后面).如果要授予所的权限则使用ALL.;databasename - 数据库名,tablename-表名,如果要授予该用户对所有数据库和表的相应操作权限则可用*表示, 如*.*.

例子:

 代码如下 复制代码
GRANT SELECT, INSERT ON test.user TO 'pig'@'%';
GRANT ALL ON *.* TO 'pig'@'%';

注意:用以上命令授权的用户不能给其它用户授权,如果想让该用户可以授权,用以下命令:

 代码如下 复制代码
GRANT privileges ON databasename.tablename TO 'username'@'host' WITH GRANT OPTION;

三.设置与更改用户密码

命令:

 代码如下 复制代码
SET PASSWORD FOR 'username'@'host' = PASSWORD('newpassword');

如果是当前登陆用户用

 代码如下 复制代码
SET PASSWORD = PASSWORD("newpassword");

例子:

 代码如下 复制代码
SET PASSWORD FOR 'pig'@'%' = PASSWORD("123456");


撤权并删除用户

要取消一个用户的权限,使用REVOKE语句。REVOKE的语法非常类似于GRANT语句,除了TO用FROM取代并且没有INDETIFED BY和WITH GRANT OPTION子句:

 

 代码如下 复制代码
REVOKE privileges (columns) ON what FROM user


user部分必须匹配原来 GRANT语句的你想撤权的用户的user部分。privileges部分不需匹配,你可以用GRANT语句授权,然后用REVOKE语句只撤销部分权限。

REVOKE语句只删除权限,而不删除用户。即使你撤销了所有权限,在user表中的用户记录依然保留,这意味着用户仍然可以连接服务器。要完全删除一个用户,你必须用一条Delete语句明确从user表中删除用户记录:

 代码如下 复制代码

%mysql -u root mysqlmysql>Delete FROM user ->Where User="user_name" and Host="host_name";mysql>FLUSH PRIVILEGES;

Delete语句删除用户记录,而FLUSH语句告诉服务器重载授权表。(当你使用GRANT和REVOKE语句时,表自动重载,而你直接修改授权表时不是。)

 

 你可能感兴趣的文章
  • mysql 创建用户与授权、修改密码
  • MySql 5.X创建用户并授权方法
bitsCN.com
Statement
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
Explain the InnoDB Buffer Pool and its importance for performance.Explain the InnoDB Buffer Pool and its importance for performance.Apr 19, 2025 am 12:24 AM

InnoDBBufferPool reduces disk I/O by caching data and indexing pages, improving database performance. Its working principle includes: 1. Data reading: Read data from BufferPool; 2. Data writing: After modifying the data, write to BufferPool and refresh it to disk regularly; 3. Cache management: Use the LRU algorithm to manage cache pages; 4. Reading mechanism: Load adjacent data pages in advance. By sizing the BufferPool and using multiple instances, database performance can be optimized.

MySQL vs. Other Programming Languages: A ComparisonMySQL vs. Other Programming Languages: A ComparisonApr 19, 2025 am 12:22 AM

Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages ​​such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages ​​have advantages in their respective fields such as data analytics, enterprise applications, and system programming.

Learning MySQL: A Step-by-Step Guide for New UsersLearning MySQL: A Step-by-Step Guide for New UsersApr 19, 2025 am 12:19 AM

MySQL is worth learning because it is a powerful open source database management system suitable for data storage, management and analysis. 1) MySQL is a relational database that uses SQL to operate data and is suitable for structured data management. 2) The SQL language is the key to interacting with MySQL and supports CRUD operations. 3) The working principle of MySQL includes client/server architecture, storage engine and query optimizer. 4) Basic usage includes creating databases and tables, and advanced usage involves joining tables using JOIN. 5) Common errors include syntax errors and permission issues, and debugging skills include checking syntax and using EXPLAIN commands. 6) Performance optimization involves the use of indexes, optimization of SQL statements and regular maintenance of databases.

MySQL: Essential Skills for Beginners to MasterMySQL: Essential Skills for Beginners to MasterApr 18, 2025 am 12:24 AM

MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

MySQL: Structured Data and Relational DatabasesMySQL: Structured Data and Relational DatabasesApr 18, 2025 am 12:22 AM

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

MySQL: Key Features and Capabilities ExplainedMySQL: Key Features and Capabilities ExplainedApr 18, 2025 am 12:17 AM

MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.

The Purpose of SQL: Interacting with MySQL DatabasesThe Purpose of SQL: Interacting with MySQL DatabasesApr 18, 2025 am 12:12 AM

SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

MySQL for Beginners: Getting Started with Database ManagementMySQL for Beginners: Getting Started with Database ManagementApr 18, 2025 am 12:10 AM

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Dreamweaver Mac version

Dreamweaver Mac version

Visual web development tools

WebStorm Mac version

WebStorm Mac version

Useful JavaScript development tools

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment