MySQL 5.7的角色功能：
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创建用户并授予用户角色功能：
mysql> create user 'junior'@'127.0.0.1' identified by '123';
Query OK, 0 rows affected (0.01 sec)
mysql> create user 'tom'@'127.0.0.1' identified by '123';
Query OK, 0 rows affected (0.00 sec)
mysql> create user 'jim'@'127.0.0.1' identified by '123';
Query OK, 0 rows affected (0.01 sec)
mysql> grant proxy on 'junior'@'127.0.0.1' to 'tom'@'127.0.0.1';
Query OK, 0 rows affected (0.01 sec)
mysql> grant proxy on 'junior'@'127.0.0.1' to 'jim'@'127.0.0.1';
Query OK, 0 rows affected (0.00 sec)
mysql> grant select on *.* to 'junior'@'127.0.0.1';
Query OK, 0 rows affected (0.00 sec)
mysql> show grants for 'junior'@'127.0.0.1';
+---------------------------------------------+
| Grants for junior@127.0.0.1 |
+---------------------------------------------+
| GRANT SELECT ON *.* TO 'junior'@'127.0.0.1' |
+---------------------------------------------+
1 row in set (0.00 sec)
mysql> show grants for 'jim'@'127.0.0.1';
+----------------------------------------------------------+
| Grants for jim@127.0.0.1 |
+----------------------------------------------------------+
| GRANT USAGE ON *.* TO 'jim'@'127.0.0.1' |
| GRANT PROXY ON 'junior'@'127.0.0.1' TO 'jim'@'127.0.0.1' |
+----------------------------------------------------------+
2 rows in set (0.00 sec)
mysql> show grants for 'tom'@'127.0.0.1';
+----------------------------------------------------------+
| Grants for tom@127.0.0.1 |
+----------------------------------------------------------+
| GRANT USAGE ON *.* TO 'tom'@'127.0.0.1' |
| GRANT PROXY ON 'junior'@'127.0.0.1' TO 'tom'@'127.0.0.1' |
+----------------------------------------------------------+
2 rows in set (0.00 sec)
mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> select * from proxies_priv;
+-----------+------+--------------+--------------+------------+----------------------+---------------------+
| Host | User | Proxied_host | Proxied_user | With_grant | Grantor | Timestamp |
+-----------+------+--------------+--------------+------------+----------------------+---------------------+
| localhost | root | | | 1 | boot@connecting host | 0000-00-00 00:00:00 |
| 127.0.0.1 | tom | 127.0.0.1 | junior | 0 | root@localhost | 0000-00-00 00:00:00 |
| 127.0.0.1 | jim | 127.0.0.1 | junior | 0 | root@localhost | 0000-00-00 00:00:00 |
+-----------+------+--------------+--------------+------------+----------------------+---------------------+
3 rows in set (0.00 sec)
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