CHIASE123.COM - Diễn đàn chia sẻ kiến thức

I - Login to MySQL

First we’ll login to the MySQL server from the command line with the following command:

Mã: Chọn tất cả

mysql -u root -p

In this case, I’ve specified the user root with the -u flag, and then used the -p flag so MySQL prompts for a password. Enter your current password to complete the login.

You should now be at a MySQL prompt that looks very similar to this:

Mã: Chọn tất cả

mysql>

II - Create MySQL User

We’ll create a user with the name testuser , and the password test123test

Mã: Chọn tất cả

CREATE USER 'testuser'@'localhost' IDENTIFIED BY 'test123test';

That’s it, congratulations! In just one command you’ve created your first MySQL user. However, this user won’t be able to do anything with MySQL until they are granted additional privileges. In fact, they won’t even be able to login without additional permissions.

III - Grant Permissions to MySQL User

The basic syntax for granting permissions is as follows:

Mã: Chọn tất cả

GRANT permission ON database.table TO 'user'@'localhost';

Here is a short list of commonly used permissions :

1. ALL – Allow complete access to a specific database. If a database is not specified, then allow complete access to the entirety of MySQL.
2. CREATE – Allow a user to create databases and tables.
3. DELETE – Allow a user to delete rows from a table.
4. DROP – Allow a user to drop databases and tables.
5. EXECUTE – Allow a user to execute stored routines.
6. GRANT OPTION – Allow a user to grant or remove another user’s privileges.
7. INSERT – Allow a user to insert rows from a table.
8. SELECT – Allow a user to select data from a database.
9. SHOW DATABASES- Allow a user to view a list of all databases.
10. UPDATE – Allow a user to update rows in a table.

Example: To grant ALL permissions for all databases and all tables to the testuser, use the following command:

Mã: Chọn tất cả

GRANT ALL ON *.* TO 'testuser'@'localhost';

Using an asterisk (*) in the place of the database or table is a completely valid option, and implies all databases or all tables.

IV - View a List of MySQL Users

Viewing a full list of MySQL users, including the host they’re associated with, can be done with the following select statement:

Mã: Chọn tất cả

SELECT User,Host FROM mysql.user;

V - Drop MySQL User

We’ll drop user with the name testuser

Mã: Chọn tất cả

DROP USER 'testuser'@'localhost';