Simplemente modifique el tipo de datos en la tabla MySQL.
Cómo ver la información de autorización de usuario existente.
Tabla de contenido
Simplemente modifique el tipo de datos en la tabla MySQL
#替换age的数据类型为int（2）
mysql> desc chengji;
+---------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+---------+-------------+------+-----+---------+-------+
| xuehao | int(6) | NO | | NULL | |
| name | varchar(10) | YES | | NULL | |
| age | int(6) | YES | | NULL | |
| address | varchar(10) | YES | | NULL | |
+---------+-------------+------+-----+---------+-------+
4 rows in set (0.00 sec)
mysql> alter table chengji modify column age int(2);
Query OK, 0 rows affected (0.01 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> desc chengji;
+---------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+---------+-------------+------+-----+---------+-------+
| xuehao | int(6) | NO | | NULL | |
| name | varchar(10) | YES | | NULL | |
| age | int(2) | YES | | NULL | |
| address | varchar(10) | YES | | NULL | |
+---------+-------------+------+-----+---------+-------+
4 rows in set (0.00 sec)
Cómo autorizar y ver información autorizada
Cómo autorizar a los usuarios a iniciar sesión
mysql> grant all privileges on *.* to 'mha'@'192.168.158.10' identified by 'manager';
Query OK, 0 rows affected (0.00 sec)
Cómo ver la información de autorización de usuario existente, almacenada en la tabla de usuarios en la biblioteca mysql
mysql> select host,user,password from mysql.user;
+----------------+-------------+-------------------------------------------+
| host | user | password |
+----------------+-------------+-------------------------------------------+
| localhost | root | |
| client1 | root | |
| 127.0.0.1 | root | |
| ::1 | root | |
| localhost | | |
| client1 | | |
| 192.168.158.% | myslave | *23AE809DDACAF96AF0FD78ED04B6A265E05AA257 |
| 192.168.158.% | mha | *7D2ABFF56C15D67445082FBB4ACD2DCD26C0ED57 |
| % | mha@server2 | *7D2ABFF56C15D67445082FBB4ACD2DCD26C0ED57 |
| server2 | mha | *7D2ABFF56C15D67445082FBB4ACD2DCD26C0ED57 |
| 192.168.158.10 | mha | *7D2ABFF56C15D67445082FBB4ACD2DCD26C0ED57 |
| 192.168.158.30 | mha | *7D2ABFF56C15D67445082FBB4ACD2DCD26C0ED57 |
| 192.168.158.20 | mha | *7D2ABFF56C15D67445082FBB4ACD2DCD26C0ED57 |
+----------------+-------------+-------------------------------------------+