1）建立使用者並設定密碼

mysql> create user lhd@'172.16.1.%' identified by '123';
Query OK, 0 rows affected (0.02 sec)

2）檢視使用者

mysql> select user,host from mysql.user;
+--------+------------------------+
| user   | host                   |
+--------+------------------------+
| qiudao | 10.0.0.0/24            |
| lhd    | 10.0
 
.0.0/255.255.255.0 |
| lhd    | 172.16.1.%             |
| root   | localhost              |
+--------+------------------------+
4 rows in set (0.00 sec)

3）刪除使用者

mysql> drop user qiudao@'10.0.0.0/24';
Query OK, 0 rows affected (0.00 sec)

4）修改使用者密碼

#1.方式一：命令列修改密碼
[root@db02 /service]# mysqladmin -uroot -p password
Enter password: 
 
123456
New password: 123
Confirm new password: 123

#2.方式二：授權的方式修改密碼
mysql> grant all on *.* to lhd@'10.0.0.0/255.255.255.0' identified by '123456';
Query OK, 0 rows affected (0.00 sec)

#3.方式三：更新資料庫密碼
mysql> update mysql.user set password=PASSWORD('123456') where user='lhd' and host='172.16.1.%';
Query OK, 
 
1 row affected (0.01 sec)
Rows matched: 1  Changed: 1  Warnings: 0

#4.方式四：直接設定密碼
mysql> set password=PASSWORD('123456');
Query OK, 0 rows affected (0.00 sec)