mysql.user细节三问

一、如何拒绝用户从某个精确ip访问数据库
假如在mysql.user表中存在用户'mydba'@'192.168.85.%'，现在想拒绝此用户从某个精确ip访问数据库

# 创建精确ip用户，分配不同的密码
mysql> create user 'mydba'@'192.168.85.1' identified by 'otherpwd';
# 精确匹配，这个ip进来的密码为otherpwd，由于密码不匹配拒绝登录

mydba@192.168.85.132,3306 [(none)]> select user,host,authentication_string from mysql.user where user='mydba';
+-------+--------------+-------------------------------------------+
| user  | host         | authentication_string                     |
+-------+--------------+-------------------------------------------+
| mydba | 192.168.85.% | *A7E26519238B6EA2F943D5FAC3CD7812AD8F87E5 |
| mydba | 192.168.85.1 | *33D5FAF1A32909300D21AB5A38FA4F215D9FCB26 |
+-------+--------------+-------------------------------------------+
2 rows in set (0.00 sec)

mydba@192.168.85.132,3306 [(none)]> select password('mysql5719'),password('otherpwd');
+-------------------------------------------+-------------------------------------------+
| password('mysql5719')                     | password('otherpwd')                      |
+-------------------------------------------+-------------------------------------------+
| *A7E26519238B6EA2F943D5FAC3CD7812AD8F87E5 | *33D5FAF1A32909300D21AB5A38FA4F215D9FCB26 |
+-------------------------------------------+-------------------------------------------+
1 row in set, 2 warnings (0.00 sec)

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