MySQL example explanation: adding accounts, granting permissions, and deleting users

1. Add account:

# 创建一个密码为123456的testuser账户# 若不写【identified by '123456'】则创建一个密码为空的testuser账户mysql> create user testuser identified by '123456';# 刷新权限变更mysql> flush privileges;

2. Grant permissions

# 为testuser账户授予本地访问所有数据库的所有权限mysql> grant all privileges on *.* to 'testuser'@'localhost' identified by '123456';
mysql> flush privileges;

Command format:

grant privilegesCode on dbName.tableName to username@host identified by "password";

privilegesCode indicates the granted permissions Type, the following types are commonly used:
all privileges: all privileges;
select: read permission;
delete : Delete permissions;
update: Update permissions;
create: Create permissions;
drop: Delete database and data table permissions.

The complete permission types are as follows:

           Select_priv: Y
           Insert_priv: Y
           Update_priv: Y
           Delete_priv: Y
           Create_priv: Y
             Drop_priv: Y
           Reload_priv: Y
         Shutdown_priv: Y
          Process_priv: Y
             File_priv: Y
            Grant_priv: Y
       References_priv: Y
            Index_priv: Y
            Alter_priv: Y
          Show_db_priv: Y
            Super_priv: Y
 Create_tmp_table_priv: Y
      Lock_tables_priv: Y
          Execute_priv: Y
       Repl_slave_priv: Y
      Repl_client_priv: Y
      Create_view_priv: Y
        Show_view_priv: Y
   Create_routine_priv: Y
    Alter_routine_priv: Y
      Create_user_priv: Y
            Event_priv: Y
          Trigger_priv: YCreate_tablespace_priv: Y

For detailed introduction, you can read the official MySQL documentation

##dbName.tableName indicates the specific library or table to which permissions are granted. Commonly used options include the following:

*.*: Grant permissions to all tables in all databases of this database server;
dbName.*: Grant Permissions for all tables in the dbName database;
dbName.dbTable: Grant permissions to the dbTable table in the database dbName.

username@host indicates the granted user and the IP address that allows the user to log in. The host has the following types:

localhost: This user is only allowed to log in locally, not remotely.
%: Allow remote login from any machine except this machine.
192.168.1.11: A specific IP indicates that the user is only allowed to log in from a specific IP.

identified by "password": Indicates the password of the access user. If there is no such statement, the default password is empty.

mysql> show grants for 'testuser';

# 将刚才创建的本地访问权限的testuser用户删除drop user testuser@'localhost';

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