search
HomeDatabaseMysql TutorialOracle用户的单张表的读写权限控制

在Oracle数据库的用户下,一张表需要做读写控制,只能读和写,不能删除和修改。开发人员开始想从用户权限上去实现。经过一番讨论

在Oracle数据库的用户下,一张表需要做读写控制,只能读和写,不能删除和修改。开发人员开始想从用户权限上去实现。

经过一番讨论,判读从权限上去实现该需求是不合适的。

这个用户下很多表,根本不会被一个人控制的。用户本身有一个权限组resource,可以对其下所有表进行增删改查。

如果要用权限来实现,那么就得将这个组去掉。这样,该用户下的其他表就得一个一个授权。还得考虑到以后新建的表。如何处理又是个问题。

因此,判断该解决方式不合适。

这种单独一张表的读写控制,不知道审计能不能实现。我想到一种另外的控制方法,让表只能读写,不能删改。这个方法就是利用触发器。

在表的每一行纪录进行增删改之前做判断,如果是增,则不做任何处理,如果是删除或者修改,直接rollback。

这样就实现了这种读写控制。

触发器代码如下:

create or replace trigger trg_test_insert_select
  before insert or  update or  delete on t_test 
  for each row
declare
  -- local variables here
begin
    CASE
    WHEN INSERTING THEN
      DBMS_OUTPUT.PUT_LINE('Inserting');
    WHEN UPDATING THEN
      DBMS_OUTPUT.PUT_LINE('Updating');
      rollback;
    WHEN DELETING THEN
      DBMS_OUTPUT.PUT_LINE('Deleting');
      rollback;
  END CASE;

end trg_test_insert_select;

测试结果如下:

SQL> insert into t_test(a) select sysdate from dual;
 
1 row inserted
 
SQL> commit;
 
Commit complete
 
SQL> delete from t_test;
 
delete from t_test
 
ORA-04092: ROLLBACK 不能在触发器中
ORA-06512: 在 "SCOTT.TRG_TEST_INSERT_SELECT", line 12
ORA-04088: 触发器 'SCOTT.TRG_TEST_INSERT_SELECT' 执行过程中出错
 
SQL> update t_test set a=sysdate+1;
 
update t_test set a=sysdate+1
 
ORA-04092: ROLLBACK 不能在触发器中
ORA-06512: 在 "SCOTT.TRG_TEST_INSERT_SELECT", line 9
ORA-04088: 触发器 'SCOTT.TRG_TEST_INSERT_SELECT' 执行过程中出错
 
注意,在应用开发时,需要将这个表的操作进行封装,,异常捕获很重要。

推荐阅读:

Oracle中的角色和权限授予

Oracle收集用户的权限

Oracle权限总结

Oracle查询指定用户有权限的所有表

修改文件目录权限导致数据库连接报错ORA-12547 

linux

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
How does MySQL's licensing compare to other database systems?How does MySQL's licensing compare to other database systems?Apr 25, 2025 am 12:26 AM

MySQL uses a GPL license. 1) The GPL license allows the free use, modification and distribution of MySQL, but the modified distribution must comply with GPL. 2) Commercial licenses can avoid public modifications and are suitable for commercial applications that require confidentiality.

When would you choose InnoDB over MyISAM, and vice versa?When would you choose InnoDB over MyISAM, and vice versa?Apr 25, 2025 am 12:22 AM

The situations when choosing InnoDB instead of MyISAM include: 1) transaction support, 2) high concurrency environment, 3) high data consistency; conversely, the situation when choosing MyISAM includes: 1) mainly read operations, 2) no transaction support is required. InnoDB is suitable for applications that require high data consistency and transaction processing, such as e-commerce platforms, while MyISAM is suitable for read-intensive and transaction-free applications such as blog systems.

Explain the purpose of foreign keys in MySQL.Explain the purpose of foreign keys in MySQL.Apr 25, 2025 am 12:17 AM

In MySQL, the function of foreign keys is to establish the relationship between tables and ensure the consistency and integrity of the data. Foreign keys maintain the effectiveness of data through reference integrity checks and cascading operations. Pay attention to performance optimization and avoid common errors when using them.

What are the different types of indexes in MySQL?What are the different types of indexes in MySQL?Apr 25, 2025 am 12:12 AM

There are four main index types in MySQL: B-Tree index, hash index, full-text index and spatial index. 1.B-Tree index is suitable for range query, sorting and grouping, and is suitable for creation on the name column of the employees table. 2. Hash index is suitable for equivalent queries and is suitable for creation on the id column of the hash_table table of the MEMORY storage engine. 3. Full text index is used for text search, suitable for creation on the content column of the articles table. 4. Spatial index is used for geospatial query, suitable for creation on geom columns of locations table.

How do you create an index in MySQL?How do you create an index in MySQL?Apr 25, 2025 am 12:06 AM

TocreateanindexinMySQL,usetheCREATEINDEXstatement.1)Forasinglecolumn,use"CREATEINDEXidx_lastnameONemployees(lastname);"2)Foracompositeindex,use"CREATEINDEXidx_nameONemployees(lastname,firstname);"3)Forauniqueindex,use"CREATEU

How does MySQL differ from SQLite?How does MySQL differ from SQLite?Apr 24, 2025 am 12:12 AM

The main difference between MySQL and SQLite is the design concept and usage scenarios: 1. MySQL is suitable for large applications and enterprise-level solutions, supporting high performance and high concurrency; 2. SQLite is suitable for mobile applications and desktop software, lightweight and easy to embed.

What are indexes in MySQL, and how do they improve performance?What are indexes in MySQL, and how do they improve performance?Apr 24, 2025 am 12:09 AM

Indexes in MySQL are an ordered structure of one or more columns in a database table, used to speed up data retrieval. 1) Indexes improve query speed by reducing the amount of scanned data. 2) B-Tree index uses a balanced tree structure, which is suitable for range query and sorting. 3) Use CREATEINDEX statements to create indexes, such as CREATEINDEXidx_customer_idONorders(customer_id). 4) Composite indexes can optimize multi-column queries, such as CREATEINDEXidx_customer_orderONorders(customer_id,order_date). 5) Use EXPLAIN to analyze query plans and avoid

Explain how to use transactions in MySQL to ensure data consistency.Explain how to use transactions in MySQL to ensure data consistency.Apr 24, 2025 am 12:09 AM

Using transactions in MySQL ensures data consistency. 1) Start the transaction through STARTTRANSACTION, and then execute SQL operations and submit it with COMMIT or ROLLBACK. 2) Use SAVEPOINT to set a save point to allow partial rollback. 3) Performance optimization suggestions include shortening transaction time, avoiding large-scale queries and using isolation levels reasonably.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

SecLists

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SAP NetWeaver Server Adapter for Eclipse

SAP NetWeaver Server Adapter for Eclipse

Integrate Eclipse with SAP NetWeaver application server.

SublimeText3 Linux new version

SublimeText3 Linux new version

SublimeText3 Linux latest version

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)