MySQL – Tidbits from the Web

Category: MySQL

Character set issues in MySQL

What follows is a collection of links that deal with common character set issues in MySQL setups.

https://wincent.com/wiki/Finding_out_the_encoding_of_a_MySQL_database
This short article desribes how to find out the current encoding settings of a MySQL database.

https://dev.mysql.com/doc/refman/5.5/en/charset-connection.html
This is the official documentation of character set manipulation in MySQL 5.5.

http://mysqldump.azundris.com/archives/60-Handling-character-sets.html
This article describes in detail how characters are represented in the database. Basically, it introduces how character encodings work.

Create a user that is allowed to log in from anywhere (with or without password ‘123’):

CREATE USER 'testuser'@'%' IDENTIFIED BY '123';
CREATE USER 'testuser'@'%';

Create a user that is allowed to log in only from localhost:

CREATE USER 'testuser'@'localhost' IDENTIFIED BY '123';

Remove a user:

DROP USER 'testuser'@'%';

Show permissions for a user:

SHOW GRANTS FOR 'testuser'@'localhost';

Grant all privileges on a specific database to a user:

CREATE DATABASE testdb;
GRANT ALL PRIVILEGES ON testdb.* TO 'testuser'@'localhost';

Grant all privileges on all databasesto a user (optionally with right to grant to other users):

GRANT ALL PRIVILEGES ON *.* TO 'testuser'@'localhost';
GRANT ALL PRIVILEGES ON *.* TO 'testuser'@'localhost' WITH GRANT OPTION;

Remove permissions of a user (w.r.t. a specific database):

REVOKE ALL PRIVILEGES FROM 'testuser'@'localhost';
REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'testuser'@'localhost';

Remove permissions of a user globally:

REVOKE ALL PRIVILEGES ON testdb.* FROM 'testuser'@'%';