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OraclePL/SQL之对象权限与系统权限的撤销差异

时间:2021-07-01 10:21:17 帮助过:20人阅读

对象权限测试: 初始状态下,user2和user3都没有user1.t1的对象权限

对象权限测试:
初始状态下,user2和user3都没有user1.t1的对象权限
user1下存在t1表:
duzz$user1@orcl>select * from t1;

C1
----------
1111

Elapsed: 00:00:00.00

user2不能查询user1.t1:
duzz$user2@orcl>select * from user1.t1;
select * from user1.t1
*
ERROR at line 1:
ORA-00942: table or view does not exist


Elapsed: 00:00:00.00

user3不能查询user1.t1:
duzz$user3@orcl>select * from user1.t1;
select * from user1.t1
*
ERROR at line 1:
ORA-00942: table or view does not exist


Elapsed: 00:00:00.01

user1赋予user2在t1上的对象权限,同时允许user2将该权限赋予别的用户:
duzz$user1@orcl>grant all on t1 to user2 with grant option;

Grant succeeded.

Elapsed: 00:00:00.00

user2已经可以查询user1.t1,同时user2将user1.t1的对象权限赋予user3:
duzz$user2@orcl>select * from user1.t1;

C1
----------
1111

Elapsed: 00:00:00.00
duzz$user2@orcl>grant all on user1.t1 to user3;

Grant succeeded.

Elapsed: 00:00:00.00
duzz$user2@orcl>

user3也可以查询user1.t1了:
duzz$user3@orcl>select * from user1.t1;

C1
----------
1111

Elapsed: 00:00:00.00

user1尝试直接从user3那里回收权限,执行语句虽然没有报错,但是并没有实际作用:
duzz$user1@orcl>revoke all on t1 from user3;

Revoke succeeded.

Elapsed: 00:00:00.00

user3仍然能够查询user1.t1:
duzz$user3@orcl>select * from user1.t1;

C1
----------
1111

Elapsed: 00:00:00.00

user1这次开始从user2那里回收权限,
duzz$user1@orcl>revoke all on t1 from user2;

Revoke succeeded.

Elapsed: 00:00:00.01

user2权限被收回:
duzz$user2@orcl>select * from user1.t1;
select * from user1.t1
*
ERROR at line 1:
ORA-00942: table or view does not exist


Elapsed: 00:00:00.01

与此同时,user3的权限也被收回:
duzz$user3@orcl>select * from user1.t1;
select * from user1.t1
*
ERROR at line 1:
ORA-00942: table or view does not exist


Elapsed: 00:00:00.01

对于对象权限,虽然不能从非直接授予的用户回收,但是回收具有级联性。


系统权限测试:
user1具有CREATE VIEW的系统权限,同时该权限可以grant给别的用户,user2和user3则没有该权限:
duzz$user1@orcl>select * from session_privs;

PRIVILEGE
---------------------------------------------------
CREATE SESSION
UNLIMITED TABLESPACE
CREATE TABLE
CREATE VIEW

Elapsed: 00:00:00.00

user2没有CREATE VIEW的系统权限:
duzz$user2@orcl>select * from session_privs;

PRIVILEGE
------------------------------------------------
CREATE SESSION
UNLIMITED TABLESPACE
CREATE TABLE

Elapsed: 00:00:00.01

user3也没有CREATE VIEW的系统权限:
duzz$user3@orcl>select * from session_privs;

PRIVILEGE
------------------------------------------------
CREATE SESSION
UNLIMITED TABLESPACE
CREATE TABLE

Elapsed: 00:00:00.01

user1将CREATE VIEW的权限赋予user2,同时赋予user2可以将该权限赋予其它用户的权限:
duzz$user1@orcl>grant create view to user2 with admin option;

Grant succeeded.

Elapsed: 00:00:00.01

user2获得CREATE VIEW的权限:
duzz$user2@orcl>select * from session_privs;

PRIVILEGE
-------------------------------------------------
CREATE SESSION
UNLIMITED TABLESPACE
CREATE TABLE
CREATE VIEW

Elapsed: 00:00:00.00


user2将CREATE VIEW的权限赋予user3:
duzz$user2@orcl>grant create view to user3;

Grant succeeded.

Elapsed: 00:00:00.00

user3获得CREATE VIEW的权限:
duzz$user3@orcl>select * from session_privs;

PRIVILEGE
--------------------------------------------------
CREATE SESSION
UNLIMITED TABLESPACE
CREATE TABLE
CREATE VIEW

Elapsed: 00:00:00.01

不同于对象权限,系统权限可以直接从非直接授予的用户上收回。
user1尝试直接从user3上回收CREATE VIEW的权限:
duzz$user1@orcl>revoke create view from user3;

Revoke succeeded.

Elapsed: 00:00:00.01

user3的CREATE VIEW的权限被收回:
duzz$user3@orcl>select * from session_privs;

PRIVILEGE
---------------------------------------------
CREATE SESSION
UNLIMITED TABLESPACE
CREATE TABLE

Elapsed: 00:00:00.01

测试系统权限是不是也像对象权限一样具有撤销级联性。
user2再次将CREATE VIEW的权限赋予user3:
duzz$user2@orcl>grant create view to user3;

Grant succeeded.

Elapsed: 00:00:00.01

user1收回user2的CREATE VIEW的权限:
duzz$user1@orcl>revoke create view from user2;

Revoke succeeded.

Elapsed: 00:00:00.00

user2的CREATE VIEW的权限被收回:
duzz$user2@orcl>select * from session_privs;

PRIVILEGE
------------------------------------------------
CREATE SESSION
UNLIMITED TABLESPACE
CREATE TABLE

Elapsed: 00:00:00.00

不过,user3仍然拥有CREATE VIEW的权限:
duzz$user3@orcl>select * from session_privs;

PRIVILEGE
-------------------------------------------------
CREATE SESSION
UNLIMITED TABLESPACE
CREATE TABLE
CREATE VIEW

Elapsed: 00:00:00.00

对于系统权限,可以从非直接授予的用户收回权限,但是不具备回收级联性。


总结:
对于对象权限,虽然不能从非直接授予的用户回收,,但是回收具有级联性。
对于系统权限,可以从非直接授予的用户收回权限,但是不具备回收级联性。

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