Oracle如何限制非法调用包中过程
Oracle如何限制非法调用包中过程 假如我有一个包P_A,其中封装了重要过程DO_A。 另有一个包P_B需要调用P_A.DO_A实现重要商业逻辑
Oracle如何限制非法调用包中过程
假如我有一个包P_A,其中封装了重要过程DO_A。
另有一个包P_B需要调用P_A.DO_A实现重要商业逻辑。
我想只授权给包P_B调用,,认为其他途径调用P_A.DO_A都是非法的!
下面根据PL/SQL开发大师[福伊尔斯坦]提供的方法实现如下:
CREATE OR REPLACE PACKAGE p_a IS
PROCEDURE do_a;
END p_a;
/
CREATE OR REPLACE PACKAGE BODY p_a IS
PROCEDURE do_a IS
BEGIN
dbms_output.put_line(‘DO_A FROM P_A’);
END do_a;
END p_a;
/
CREATE OR REPLACE PACKAGE P_B
IS
PROCEDURE DO_B;
END P_B;
/
CREATE OR REPLACE PACKAGE BODY P_B
IS
PROCEDURE DO_B
IS
BEGIN
P_A.DO_A;
END DO_B;
END P_B;
/
BEGIN
P_A.DO_A; –被认为是非法调用
P_B.DO_B; –唯一合法调用
END;
/
–如何限制只有P_B可调用P_A.DO_A?
–12c以前,我们使用DBMS_UTILITY .FORMAT_CALL_STACK
–编写自定义函数:
CREATE OR REPLACE FUNCTION i_was_called_by (program_in IN VARCHAR2)
RETURN BOOLEAN
IS
c_stack CONSTANT VARCHAR2 (32767)
:= DBMS_UTILITY.format_call_stack;
BEGIN
RETURN INSTR (SUBSTR (c_stack,
INSTR (c_stack,
CHR (10),1,5)+ 1,
INSTR (c_stack, CHR (10),1,6)
- INSTR (c_stack,CHR (10),1,5)
+ 1),
program_in) > 0;
END;
—– PL/SQL Call Stack —–
object line object
handle number name
000007FF50456200 4 function SCOTT.I_WAS_CALLED_BY
000007FF504ADD28 4 package body SCOTT.P_A
000007FF50439820 2 anonymous block
–修改P_A.DO_A过程:
PROCEDURE DO_A
IS
BEGIN
IF i_was_called_by (‘P_B’)
THEN
dbms_output.put_line(‘DO_A FROM P_A’);
ELSE
RAISE_APPLICATION_ERROR(-20209, ‘非法调用!’);
END IF;
END;
/
–再次调用发现
BEGIN
*
第 1 行出现错误:
ORA-20209: 非法调用!
ORA-06512: 在 “SCOTT.P_A”, line 7
ORA-06512: 在 line 2
–12c以后,我们使用包的ACCESSIBLE BY条件
–修改包P_A说明部分
CREATE OR REPLACE PACKAGE p_a
ACCESSIBLE BY(P_B)
IS
PROCEDURE do_a;
END p_a;
/
本文永久更新链接地址:

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

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

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

MySQL is an open source relational database management system, mainly used to store and retrieve data quickly and reliably. Its working principle includes client requests, query resolution, execution of queries and return results. Examples of usage include creating tables, inserting and querying data, and advanced features such as JOIN operations. Common errors involve SQL syntax, data types, and permissions, and optimization suggestions include the use of indexes, optimized queries, and partitioning of tables.

Solutions to Oracle cannot be opened include: 1. Start the database service; 2. Start the listener; 3. Check port conflicts; 4. Set environment variables correctly; 5. Make sure the firewall or antivirus software does not block the connection; 6. Check whether the server is closed; 7. Use RMAN to recover corrupt files; 8. Check whether the TNS service name is correct; 9. Check network connection; 10. Reinstall Oracle software.

MySQL is chosen for its performance, reliability, ease of use, and community support. 1.MySQL provides efficient data storage and retrieval functions, supporting multiple data types and advanced query operations. 2. Adopt client-server architecture and multiple storage engines to support transaction and query optimization. 3. Easy to use, supports a variety of operating systems and programming languages. 4. Have strong community support and provide rich resources and solutions.

The method to solve the Oracle cursor closure problem includes: explicitly closing the cursor using the CLOSE statement. Declare the cursor in the FOR UPDATE clause so that it automatically closes after the scope is ended. Declare the cursor in the USING clause so that it automatically closes when the associated PL/SQL variable is closed. Use exception handling to ensure that the cursor is closed in any exception situation. Use the connection pool to automatically close the cursor. Disable automatic submission and delay cursor closing.

In Oracle, the FOR LOOP loop can create cursors dynamically. The steps are: 1. Define the cursor type; 2. Create the loop; 3. Create the cursor dynamically; 4. Execute the cursor; 5. Close the cursor. Example: A cursor can be created cycle-by-circuit to display the names and salaries of the top 10 employees.

To stop an Oracle database, perform the following steps: 1. Connect to the database; 2. Shutdown immediately; 3. Shutdown abort completely.

Oracle is not only a database company, but also a leader in cloud computing and ERP systems. 1. Oracle provides comprehensive solutions from database to cloud services and ERP systems. 2. OracleCloud challenges AWS and Azure, providing IaaS, PaaS and SaaS services. 3. Oracle's ERP systems such as E-BusinessSuite and FusionApplications help enterprises optimize operations.

Building a Hadoop Distributed File System (HDFS) on a CentOS system requires multiple steps. This article provides a brief configuration guide. 1. Prepare to install JDK in the early stage: Install JavaDevelopmentKit (JDK) on all nodes, and the version must be compatible with Hadoop. The installation package can be downloaded from the Oracle official website. Environment variable configuration: Edit /etc/profile file, set Java and Hadoop environment variables, so that the system can find the installation path of JDK and Hadoop. 2. Security configuration: SSH password-free login to generate SSH key: Use the ssh-keygen command on each node
