Bases de datos: Software libre - Universitat Oberta de Catalunya

© FUOC • 71Z799014MO 46 Bases de datos en MySQL
mysql> show columns from user;
+-----------------+------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------------+------------------+------+-----+---------+-------+
| Host | char(60) binary | PRI | | | |
| User | char(16) binary | PRI | | | |
| Password | char(16) binary | | | | |
| Select_priv | enum('N','Y') | N | | | |
| Insert_priv | enum('N','Y') | | N | | |
| Update_priv | enum('N','Y') | N | | | |
| Delete_priv | enum('N','Y') | | N | | |
| Create_priv | enum('N','Y') | N | | | |
| Drop_priv | enum('N','Y') | N | | | |
| Reload_priv | enum('N','Y') | | N | | |
| Shutdown_priv | enum('N','Y') | N | | | |
| Process_priv | enum('N','Y') | N | | | |
| File_priv | enum('N','Y') | | N | | |
| Grant_priv | enum('N','Y') | | N | | |
| References_priv | enum('N','Y') | | N | | |
| Index_priv | enum('N','Y') | | N | | |
| Alter_priv | enum('N','Y') | |N | | |
+-----------------+------------------+------+-----+---------+-------+
17 rows in set (0.04 sec)
mysql> show columns from db;
+-----------------+------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------------+------------------+------+-----+---------+-------+
| Host | char(60) binary | PRI | | | |
| Db | char(64) binary | PRI | | | |
| User | char(16) binary | PRI | | | |
| Select_priv | enum('N','Y') | | N | | |
| Insert_priv | enum('N','Y') | | N | | |
| Update_priv | enum('N','Y') | | N | | |
| Delete_priv | enum('N','Y') | | N | | |
| Create_priv | enum('N','Y') | | N | | |
| Drop_priv | enum('N','Y') | | N | | |
| Grant_priv | enum('N','Y') | | N | | |
| References_priv | enum('N','Y') | | N | N | |
| Index_priv | enum('N','Y') | | N | | |
| Alter_priv | enum('N','Y') | | N | | |
+-----------------+------------------+------+-----+---------+-------+
13 rows in set (0.00 sec)
mysql> show columns from tables_priv;
+--------------+----------------------------------------------------------------------------------------------+----+---+-------+-----+
| Field | Type |Null|Key|Default|Extra|
+--------------+----------------------------------------------------------------------------------------------+----+---+-------+-----+
| Host | char(60) binary |PRI | | | |
| Db | char(64) binary |PRI | | | |
| User | char(16) binary |PRI | | | |
| Table_name | char(60) binary | | N | | |
| Grantor | char(77) | | N | | |
| Timestamp | timestamp(14) | | N | | |
| Table_priv | set('Select','Insert','Update','Delete','Create','Drop','Grant','References','Index','Alter')| | N | | |
| Column_priv | set('Select','Insert','Update','References') |N | | | |
+--------------+----------------------------------------------------------------------------------------------+----+---+-------+-----+
8 rows in set (0.00 sec)
Es posible realizar modificaciones directamente sobre estas tablas y obtener los
mismos resultados que si utilizáramos los comandos grant, revoke, set password
o drop user:
mysql> update user
-> set Password = password(’nuevapasswd’)
-> where User =’visitante’ and Host = ’localhost’;
mysql> flush privileges;