Mysql用户管理相关

当前使用的user及host:

mysql> select USER();

+----------------+

| USER()         |

+----------------+

| root@localhost |

+----------------+

1 row in set (0.00 sec)

添加用户

Mysql5以前版本直接使用 INSERT 向 mysql 表中插入mysql用户了,mysql5之后不可以这样操作  

mysql> insert into mysql.user(Host,User,PassWord) values("localhost","test_user",password("123123"));

ERROR 1062 (23000): Duplicate entry "localhost-test_user" for key "PRIMARY"

增加用户 {授予用户指定数据表权限 [使用 GRANT 命令 对用户进行相应授权]}

mysql> GRANT all privileges ON table1.* TO 
"test_user"@"localhost" IDENTIFIED BY "123123" WITH GRANT OPTioN;

Query OK, 0 rows affected (0.02 sec)

IDENTIFIED BY 指定用户的登录密码

ALL PRIVILEGES 是表示所有权限，也可以使用 select、update 等权限  
*.  中前面的*号用来指定数据库名，后面的*号用来指定表名  
TO 表示将权限赋予某个用户  
ON 用来指定权限针对哪些库和表  
"test_user"@"localhost" 表示test_user用户，@后面接限制的主机，可以是IP、IP段、域名以及%，%表示任何地方  
WITH GRANT OPTION 这个选项表示该用户可以将自己拥有的权限授权给别人
 
需要刷新系统权限表[flush privilege] 该用户才能生效登录

mysql> flush privileges;    

删除用户

mysql> drop user "test_user"@"localhost";

查看当前用户的权限

mysql> SHOW GRANTS;
+----------------------------------------------------------------------------------------------------------------------------------------+
| Grants for root@localhost                                                                                                              |
+----------------------------------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO "root"@"localhost" IDENTIFIED BY PASSWORD "*E56A114692FE0DE073F9A1DD68A00EEB9703F3F1" WITH GRANT OPTION |
| GRANT PROXY ON ""@"" TO "root"@"localhost" WITH GRANT OPTION                                                                           |
+----------------------------------------------------------------------------------------------------------------------------------------+

查看某个用户的权限

mysql> show grants for "test_user"@"localhost"
+------------------------------------------------------------------------------------------------------------+
| Grants for test_user@localhost                                                                                   |
+------------------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO "test_user"@"localhost" IDENTIFIED BY PASSWORD "*E56A114692FE0DE073F9A1DD68A00EEB9703F3F1" |
| GRANT ALL PRIVILEGES ON table1.* TO "test_user"@"localhost" WITH GRANT OPTION                                 |
+------------------------------------------------------------------------------------------------------------+

对账户重命名

mysql> rename user "test_user"@"localhost" to "bb"@"localhost";

修改密码

1.用set password命令  

mysql> SET PASSWORD FOR "test_user"@"localhost" = PASSWORD("123456");

2.用 mysqladmin [进入bin目录]   
备注:{格式: mysqladmin -u用户名 -p旧密码 password 新密码]

/usr/bin$ mysqladmin -utest_user -p123456 password 123123
mysqladmin: Can"t turn off logging; error: "Access denied; you need (at least one of) the SUPER privilege(s) for this operation"

3.用 update 直接编辑 user 表  

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> update user set PASSWORD = PASSWORD("123123") where user = "test_user";
Query OK, 1 row affected (0.04 sec)
Rows matched: 1  Changed: 1  Warnings: 0