How to set password for user in mysql

In the MySQL database, setting passwords for users can help protect sensitive information and prevent malicious users from accessing or modifying data. MySQL supports multiple password verification methods and can set different passwords for different users. This article explains how to set user passwords in MySQL.

1. Create user

The syntax for creating a user in MySQL is as follows:

CREATE USER 'username'@'localhost' IDENTIFIED BY 'password';

Where, 'username' is the user name you want to create, ' localhost' is the user's hostname and 'password' is the user's password. If you want users to access MySQL from any host, you can set the host name to '%':

CREATE USER 'username'@'%' IDENTIFIED BY 'password';

2. Change password

To change the user password, you can use the following Statement:

ALTER USER 'username'@'localhost' IDENTIFIED BY 'new_password';

Among them, 'username' and 'localhost' are the user name and host name respectively for which you want to change the password, and 'new_password' is the new password.

3. Delete user

If you want to delete a user, you can use the following statement:

DROP USER 'username'@'localhost';

Where 'username' and 'localhost' are you respectively The username and hostname to delete.

4. Password verification method

MySQL supports multiple password verification methods, including the original password storage method before MySQL 4.1, the old password storage method from MySQL 4.1 to 5.6, and MySQL New password storage method after 5.7. You can view all encryption methods supported on the current system through the following command:

SHOW VARIABLES LIKE 'validate_password%';

5. Set global password policy

MySQL also supports setting global password policy, including password length and size Write letters, numbers, special characters, etc. The password policy can be set through the following command:

SET GLOBAL validate_password.policy=LOW;

where the policy parameter can be LOW, MEDIUM or STRONG.

6. Set user password policy

To set a password policy for a user, you can use the following statement:

ALTER USER 'username'@'localhost' PASSWORD EXPIRE INTERVAL 30 DAY;

This way you can set the user's password Expires after 30 days. The user needs to reset their password the next time they log in.

In summary, MySQL user password setting is a very important part of the MySQL database, which can help protect sensitive data and prevent illegal access. Mastering the skill of setting MySQL user passwords is crucial to improving database security.

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