MySQL create user and authorize

MySQL Create users and authorize

Create user

1. Use Command to create

   # Use  CREATE
    CREATE USER 'testDatabase'@'%' IDENTIFIED BY '111111';
   # CREATE USER ' Your username '@' Database accessible ip,% Express all ' IDENTIFIED BY ' Database password 
   #  Use GRANT USAGE,USAGE Indicates that you do not have any permissions .
   GRANT USAGE ON *.* TO 'dummy'@'localhost';
   

2. sql establish

   INSERT INTO user (Host,User,Password) values('ip',' user name ',' password ')
   

User authorization

1. Use Command to create

   GRANT ALL ON testDatabase_jixian.* TO 'username'@'%';
   

2. sql establish

   INSERT INTO user (Host, User, Password)
       (HOST,Db, USER,
        Select_priv,Insert_priv,Update_priv,Delete_priv,Create_priv,Drop_priv)
       VALUES
   ('ip',' database ',' user name ',
       'Y','Y','Y','Y','Y','Y');
   

explain

• GRANT
• ALL # all Indicates that you have all the permissions on the database , also SELECT,INSERT,UPDATE,delete,drop,create wait . Built or not all
• ON testDatabase_jixian.* Database name . Table name ,* Represents all databases or all tables ,
• TO
• ‘username’@‘%’; # User name and ip

Be careful ：

1. User reconnection is required after authorization MySQL, To obtain the corresponding permission .
2. Users authorized by the above command cannot authorize other users , If you want to activate this authorization , Use the following command :

#  add  WITH GRANT OPTION
GRANT privilegesxxx ON databasename.tablename TO 'username'@'host' WITH GRANT OPTION;

View user authorization

SHOW GRANTS FOR 'username'@'%'

Set and change user passwords

SET PASSWORD FOR 'username'@' Appoint ip' = PASSWORD(' password ');

If it is the current login user, you can directly use :

SET PASSWORD = PASSWORD(" password ");

Example ：

SET PASSWORD FOR 'username'@'%' = PASSWORD("123456");

Revoke user privileges

REVOKE privilegexxx ON databasename.tablenamexxx FROM 'username'@' Appoint ip';

Example ：

REVOKE SELECT ON *.* FROM 'username'@'%'; #  revoke SELECT jurisdiction 

Be careful ：

If you give users 'username'@'%' The authorized command is （ Or similar ）：GRANT SELECT ON test.user TO 'username'@'%', So use REVOKE SELECT ON *.* FROM 'username'@'%' The command does not undo the user pair test In the database user Tabular SELECT operation . contrary , If authorized to use is GRANT SELECT ON *.* TO 'username'@'%'; that REVOKE SELECT ON test.user FROM 'username'@'%' The command also cannot undo the user pair test In the database user Tabular Select jurisdiction .

Delete user

DROP USER 'username'@' Appoint ip'; --  Mode one 
delete from mysql.user where user="username"; --  Mode two