openGauss每日一练第19天 | 用户和角色管理

1、创建test10_tbs的表空间，在这个表空间中创建数据库testdb10

omm=# CREATE TABLESPACE test10_tbs RELATIVE LOCATION 'tablespace/test10_tbs1';
CREATE TABLESPACE
omm=# CREATE DATABASE testdb10 WITH TABLESPACE = test10_tbs;
CREATE DATABASE

2、使用create user创建用户user10，登录数据库testdb10，创建测试表t1和t2

--创建一个名叫user10的数据库用户，其密码为kunpeng@2022
omm=# CREATE USER user10 IDENTIFIED BY 'kunpeng@2022';
NOTICE:  The encrypted password contains MD5 ciphertext, which is not secure.
CREATE ROLE

omm=# GRANT ALL ON DATABASE testdb10 TO user10;
omm=# GRANT
omm=# ALTER USER user10 sysadmin;
ALTER ROLE

--执行下面的gsql元命令，查看系统目前有哪些数据库：
omm=# \l
                         List of databases
   Name    | Owner | Encoding | Collate | Ctype | Access privileges 
-----------+-------+----------+---------+-------+-------------------
 omm       | omm   | UTF8     | C       | C     | 
 postgres  | omm   | UTF8     | C       | C     | 
 template0 | omm   | UTF8     | C       | C     | =c/omm           +
           |       |          |         |       | omm=CTc/omm
 template1 | omm   | UTF8     | C       | C     | =c/omm           +
           |       |          |         |       | omm=CTc/omm
 testdb10  | omm   | UTF8     | C       | C     | 
(5 rows)

--执行下面的gsql元命令，查看系统目前有哪些用户：
omm=# \du
                                                              List of roles
 Role name |                                                    Attributes      
                                              | Member of 
-----------+--------------------------------------------------------------------
----------------------------------------------+-----------
 gaussdb   | Sysadmin                                                           
                                              | {}
 omm       | Sysadmin, Create role, Create DB, Replication, Administer audit, Mo
nitoradmin, Operatoradmin, Policyadmin, UseFT | {}
 user10    |                                                                    
                                              | {}
omm=# \q

--用刚刚创建的数据库用户user1登录到数据库testdb
omm@modb:~$ gsql -d testdb10 -U user10 -W kunpeng@2022 -r
gsql ((openGauss 3.0.0 build 02c14696) compiled at 2022-04-01 18:12:00 commit 0 last mr  )
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.

testdb10=> CREATE TABLE t1(col int);
CREATE TABLE
testdb10=> CREATE TABLE t2(col int);
CREATE TABLE

3、使用create role创建角色role10，登录数据库testdb10

--创建一个新的名叫role10的角色，并将数据库testdb10所有的权限都授予role10：
omm=# CREATE ROLE role10 IDENTIFIED BY 'kunpeng@2022';
NOTICE:  The encrypted password contains MD5 ciphertext, which is not secure.
omm=# CREATE ROLE

omm=# GRANT ALL ON DATABASE testdb10 TO role10;
GRANT

--使用用户role10尝试登录到数据库testdb：
omm@modb:~$ gsql -d testdb10 -U role10 -W kunpeng@2022 -r
gsql: FATAL:  role "role10" is not permitted to login

由于数据库用户role10是使用create role语句创建的，目前还不被允许登录到openGauss数据库管理系统。
omm=# \du
                                                              List of roles
 Role name |                                                    Attributes      
                                              | Member of 
-----------+--------------------------------------------------------------------
----------------------------------------------+-----------
 gaussdb   | Sysadmin                                                           
                                              | {}
                                              | {}

 omm       | Sysadmin, Create role, Create DB, Replication, Administer audit, Mo
nitoradmin, Operatoradmin, Policyadmin, UseFT | {}
 role10    | Cannot login                                                       
                                              | {}
 user10    |                                         
 
 --授予用户role10登录权限后，可以登录数据库
omm@modb:~$ gsql -r
gsql ((openGauss 3.0.0 build 02c14696) compiled at 2022-04-01 18:12:00 commit 0 last mr  )
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.

omm=# alter user role10 LOGIN;
ALTER ROLE
omm=# \q
omm@modb:~$ gsql -d testdb10 -U role10 -W kunpeng@2022 -r
gsql ((openGauss 3.0.0 build 02c14696) compiled at 2022-04-01 18:12:00 commit 0 last mr  )
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.

4、将表t1直接删除，将前面创建的表空间和数据库、表t2转给role10，删除用户user10

testdb10=> drop table t1;
DROP TABLE

--要删除用户user10，先表空间对象和数据库对象的属主修改为其他的用户（如role10）：
testdb10=> alter database testdb10 owner to role10;
ALTER DATABASE
testdb10=> alter tablespace test10_tbs owner to role10;
testdb10=> ALTER TABLESPACE

omm=# drop user user10;
ERROR:  role "user10" cannot be dropped because some objects depend on it
DETAIL:  privileges for database testdb10

--将user10对象及表t2转移给role10：
omm=# REASSIGN OWNED BY user10 to role10;
omm=# REASSIGN OWNED

--回收用户user2对testdb数据库的权限：
omm=# REVOKE ALL ON DATABASE testdb10 from user10;
REVOKE

--删除用户user10
omm=# drop user user10;
DROP ROLE

5、最后删除role10

--删除role10下的表t2：
omm@modb:~$ gsql -d testdb10 -U role10 -W kunpeng@2022 -r
gsql ((openGauss 3.0.0 build 02c14696) compiled at 2022-04-01 18:12:00 commit 0 last mr  )
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.

testdb10=> \dt
                         List of relations
 Schema | Name | Type  | Owner  |             Storage              
--------+------+-------+--------+----------------------------------
 public | t2   | table | role10 | {orientation=row,compression=no}
(1 row)

testdb10=> drop table t2;
testdb10=> DROP TABLE

--回收用户user2对testdb数据库的权限：
omm@modb:~$ gsql -r
gsql ((openGauss 3.0.0 build 02c14696) compiled at 2022-04-01 18:12:00 commit 0 last mr  )
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.

omm=# REVOKE ALL ON TABLESPACE test10_tbs from role10;
REVOKE
omm=# REVOKE ALL ON DATABASE testdb10 from role10;
REVOKE

--删除role10
omm=# drop user role10;
DROP ROLE