windows下远程访问linux中的mysql数据库（创建数据库新用户）

如果想要远程访问数据库，数据库必须开启权限，允许可以被远程访问。

1.进入Linux系统mysql数据库查看user表

mysql> use mysql;
mysql> select User,Host from user;
+---------------+-----------+
| User          | Host      |
+---------------+-----------+
| mysql.session | localhost |
| mysql.sys     | localhost |
| root          | localhost |
+---------------+-----------+

Host字段中，‘localhost’表示只可以进行本地连接，所以要先创建一个可以进行远程连接的用户。（其Host字段中值为‘%’）。

2.在Linux系统创建新用户

mysql> CREATE USER 'admin'@'%' IDENTIFIED BY 'password';
Query OK, 0 rows affected (0.03 sec)

mysql> GRANT SHOW VIEW, SELECT, REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'admin'@'%';
Query OK, 0 rows affected (0.01 sec)

mysql> FLUSH PRIVILEGES;  //更新权限
Query OK, 0 rows affected (0.00 sec)

!!创建新用户可能遇到的问题!!

密码策略问题异常信息：
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
解决办法：
1、查看 mysql 初始的密码策略，
输入语句 “ SHOW VARIABLES LIKE ‘validate_password%’; ” 进行查看，

mysql> SHOW VARIABLES LIKE 'validate_password%';

+--------------------------------------+--------+
| Variable_name                        | Value  |
+--------------------------------------+--------+
| validate_password_check_user_name    | OFF    |
| validate_password_dictionary_file    |        |
| validate_password_length             | 8      |
| validate_password_mixed_case_count   | 1      |
| validate_password_number_count       | 1      |
| validate_password_policy             | MEDIUM |
| validate_password_special_char_count | 1      |
+--------------------------------------+--------+

2、设置密码的验证强度等级，设置 validate_password_policy 的全局参数为 LOW 即可，输入设值语句 “ set global validate_password_policy=LOW; ”

mysql> set global validate_password_policy=LOW;
Query OK, 0 rows affected (0.00 sec)

mysql> SHOW VARIABLES LIKE 'validate_password%';
+--------------------------------------+-------+
| Variable_name                        | Value |
+--------------------------------------+-------+
| validate_password_check_user_name    | OFF   |
| validate_password_dictionary_file    |       |
| validate_password_length             | 8     |
| validate_password_mixed_case_count   | 1     |
| validate_password_number_count       | 1     |
| validate_password_policy             | LOW   |
| validate_password_special_char_count | 1     |
+--------------------------------------+-------+

好了，这样就可以随意设个简单的8位密码了

3.在Linux系统查看新用户

mysql> use mysql;
mysql> select User,Host from user;
+---------------+-----------+
| User          | Host      |
+---------------+-----------+
| admin         | %         |
| mysql.session | localhost |
| mysql.sys     | localhost |
| root          | localhost |
+---------------+-----------+