search
HomeDatabaseMysql TutorialCommon operations for mysql users

Common operations for mysql users

Jun 23, 2017 pm 03:06 PM
mysqlcommonoperateuser

1. Create a user:
Command: CREATE USER 'username'@'host' IDENTIFIED BY 'password';
Instructions: username - the username you will create, host - Specify which host the user can log in to. If it is a local user, localhost can be used. If you want the user to log in from any remote host, you can use the wildcard character %. password - the user's login password. The password can be empty. If it is empty, Then the user can log in to the server without a password.
Example: CREATE USER 'testuser'@'localhost' IDENTIFIED BY '123456';
CREATE USER 'testuser'@'192.168.1.101_' IDENDIFIED BY '123456' ;
CREATE USER 'testuser'@'%' IDENTIFIED BY '123456';
CREATE USER 'testuser'@'%' IDENTIFIED BY '';
CREATE USER 'testuser'@'%';
2. Authorization:

Command: GRANT privileges ON databasename.tablename TO 'username'@'host'

Description: privileges - user's operation permissions, such as SELECT, INSERT, UPDATE, etc. (see the end of this article for a detailed list). If you want to grant all permissions, use ALL.; databasename - database name, tablename - table name, if you want to grant the user the corresponding operations on all databases and tables Permissions can be represented by *, such as *.*.

Example: GRANT SELECT, INSERT ON test.user TO 'testuser'@'%';
GRANT ALL ON *.* TO 'testuser'@ '%';

Note: Users authorized with the above command cannot authorize other users. If you want the user to be able to authorize, use the following command:
GRANT privileges ON databasename.tablename TO 'username'@ 'host' WITH GRANT OPTION;

3. Set and change user password

Command: SET PASSWORD FOR 'username'@'host' = PASSWORD('newpassword' ); If it is the currently logged in user, use SET PASSWORD = PASSWORD("newpassword");

Example: SET PASSWORD FOR 'testuser'@'%' = PASSWORD("123456");

4. Revoke user privileges

Command: REVOKE privilege ON databasename.tablename FROM 'username'@'host';

Description: privilege, databasename, tablename - same authorization Part.

Example: REVOKE SELECT ON *.* FROM 'testuser'@'%';

Note: This is what happens if you authorize user 'pig'@'%' (or similar): GRANT SELECT ON test.user TO 'testuser'@'%', then using the REVOKE SELECT ON *.* FROM 'testuser'@'%'; command cannot revoke the user's access to the test database. SELECT operation of the user table. On the contrary, if the authorization is using GRANT SELECT ON *.* TO 'testuser'@'%';, then the REVOKE SELECT ON test.user FROM 'testuser'@'%'; command cannot revoke the user. Select permission on the user table in the test database.

Detailed information can be viewed with the command SHOW GRANTS FOR 'testuser'@'%';.

5. Delete users

Command: DROP USER 'username'@'host';

The above is the detailed content of Common operations for mysql users. For more information, please follow other related articles on the PHP Chinese website!

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
How does MySQL handle data replication?How does MySQL handle data replication?Apr 28, 2025 am 12:25 AM

MySQL processes data replication through three modes: asynchronous, semi-synchronous and group replication. 1) Asynchronous replication performance is high but data may be lost. 2) Semi-synchronous replication improves data security but increases latency. 3) Group replication supports multi-master replication and failover, suitable for high availability requirements.

How can you use the EXPLAIN statement to analyze query performance?How can you use the EXPLAIN statement to analyze query performance?Apr 28, 2025 am 12:24 AM

The EXPLAIN statement can be used to analyze and improve SQL query performance. 1. Execute the EXPLAIN statement to view the query plan. 2. Analyze the output results, pay attention to access type, index usage and JOIN order. 3. Create or adjust indexes based on the analysis results, optimize JOIN operations, and avoid full table scanning to improve query efficiency.

How do you back up and restore a MySQL database?How do you back up and restore a MySQL database?Apr 28, 2025 am 12:23 AM

Using mysqldump for logical backup and MySQLEnterpriseBackup for hot backup are effective ways to back up MySQL databases. 1. Use mysqldump to back up the database: mysqldump-uroot-pmydatabase>mydatabase_backup.sql. 2. Use MySQLEnterpriseBackup for hot backup: mysqlbackup--user=root-password=password--backup-dir=/path/to/backupbackup. When recovering, use the corresponding life

What are some common causes of slow queries in MySQL?What are some common causes of slow queries in MySQL?Apr 28, 2025 am 12:18 AM

The main reasons for slow MySQL query include missing or improper use of indexes, query complexity, excessive data volume and insufficient hardware resources. Optimization suggestions include: 1. Create appropriate indexes; 2. Optimize query statements; 3. Use table partitioning technology; 4. Appropriately upgrade hardware.

What are views in MySQL?What are views in MySQL?Apr 28, 2025 am 12:04 AM

MySQL view is a virtual table based on SQL query results and does not store data. 1) Views simplify complex queries, 2) Enhance data security, and 3) Maintain data consistency. Views are stored queries in databases that can be used like tables, but data is generated dynamically.

What are the differences in syntax between MySQL and other SQL dialects?What are the differences in syntax between MySQL and other SQL dialects?Apr 27, 2025 am 12:26 AM

MySQLdiffersfromotherSQLdialectsinsyntaxforLIMIT,auto-increment,stringcomparison,subqueries,andperformanceanalysis.1)MySQLusesLIMIT,whileSQLServerusesTOPandOracleusesROWNUM.2)MySQL'sAUTO_INCREMENTcontrastswithPostgreSQL'sSERIALandOracle'ssequenceandt

What is MySQL partitioning?What is MySQL partitioning?Apr 27, 2025 am 12:23 AM

MySQL partitioning improves performance and simplifies maintenance. 1) Divide large tables into small pieces by specific criteria (such as date ranges), 2) physically divide data into independent files, 3) MySQL can focus on related partitions when querying, 4) Query optimizer can skip unrelated partitions, 5) Choosing the right partition strategy and maintaining it regularly is key.

How do you grant and revoke privileges in MySQL?How do you grant and revoke privileges in MySQL?Apr 27, 2025 am 12:21 AM

How to grant and revoke permissions in MySQL? 1. Use the GRANT statement to grant permissions, such as GRANTALLPRIVILEGESONdatabase_name.TO'username'@'host'; 2. Use the REVOKE statement to revoke permissions, such as REVOKEALLPRIVILEGESONdatabase_name.FROM'username'@'host' to ensure timely communication of permission changes.

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

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

PhpStorm Mac version

PhpStorm Mac version

The latest (2018.2.1) professional PHP integrated development tool

SecLists

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

SublimeText3 English version

SublimeText3 English version

Recommended: Win version, supports code prompts!