oracle stored procedure debugging

Oracle stored procedure is an executable program written and stored in the database, which can accept input parameters and return results. In complex business processing, stored procedures are usually used to control business processes, optimize performance, reduce maintenance costs, and improve data security.

When writing stored procedures, you will inevitably encounter some errors and exceptions, such as data type mismatch, SQL statement errors, null pointer references, etc. At this time, you need to use the debugging tools provided by Oracle to diagnose and solve these problems.

This article will introduce the debugging method of stored procedures in Oracle to help readers develop and maintain stored procedures more efficiently.

1. Debugging preparation

Before debugging the stored procedure, you need to make the following preparations:

1. Create the stored procedure

First, you need to create a stored procedure in the Oracle database. You can use tools such as SQL Developer to create new code modules in the database and write code for stored procedures.

For example, here is a simple stored procedure example:

CREATE OR REPLACE PROCEDURE my_proc (p_num1 IN NUMBER, p_num2 IN NUMBER, p_result OUT NUMBER)
AS
BEGIN
p_result := p_num1 p_num2;
END;

This stored procedure accepts two input parameters, adds them, and passes the result to the output parameter p_result.

2. Set debugging information

To debug stored procedures, you need to set Oracle PL/SQL debugging information. It can be set by adding the following statement at the beginning of the stored procedure code:

SET SERVEROUTPUT ON;
ALTER SESSION SET PLSQL_DEBUG=TRUE;

The function of the above two statements is to turn on the display output information and enable PL/SQL debugging capabilities. They can help us obtain more useful information when the stored procedure is executed, so as to better diagnose the problem.

3. Prepare test data

When debugging a stored procedure, you need to prepare a set of test data for testing and debugging when executing the stored procedure. Test data should cover all possible execution situations of the stored procedure, including normal situations, abnormal situations, etc.

2. Use debugging tools

After completing the above debugging preparations, you can start using the debugging tools provided by Oracle to debug stored procedures.

1. SQL Developer debugging stored procedures

SQL Developer is an integrated development environment (IDE) provided by Oracle, which can help developers write, debug and manage Oracle Database related code and objects. The following describes how to debug stored procedures in SQL Developer:

(1) Open the stored procedure in SQL Developer

First, you need to open the stored procedure in SQL Developer. Find the package or module where the stored procedure is located in the Object Explorer on the left, and double-click to open it.

(2) Set breakpoint

In the stored procedure code, use the left mouse button to click the line number where you want to set the breakpoint, and an indicator will appear. You can click this indicator to set or cancel breakpoints.

(3) Run debugging

After setting the breakpoint, click the debugging icon (little bug) in the upper left corner to enter the debugging mode. In debug mode, you can step through code, view variable values, and more. During the debugging process, the execution process information will be displayed in the debugging window on the right.

(4) Check the output information

When executing the stored procedure, turn on the output information through the SET SERVEROUTPUT ON statement. In the debug window, you can view the output of the stored procedure.

2. Using the PL/SQL Debugger

In addition to SQL Developer, Oracle also provides a stand-alone PL/SQL debugger that can run directly in the database instance . You can use the PL/SQL debugger by following the steps below:

(1) Start debugging

In SQL Plus or other SQL interface, run the following command to start the PL/SQL debugger:

EXECUTE DBMS_DEBUG_JDWP.CONNECT_TCP('localhost',4000);

After execution, the debugger will be started and wait for the connection with the client.

(2) Start the debugging client

In the Java development environment, create a Java application and use JDI (Java Debug Interface) to connect to the debugger. You need to use the "JPDA (Java Platform Debugger Architecture)" function of the Java virtual machine.

For example, in Eclipse, you can create a Java Debug configuration and set the Host and Port parameters to connect the debugger:

(3) Debugging process

In the debugging client After the connection is successful, you can start debugging the stored procedure. During debugging, you can step through code, view variable values, and more.

3. Common debugging skills

When using SQL Developer or PL/SQL debugger to debug stored procedures, the following tips can help developers diagnose problems more efficiently:

1. Single-step debugging

During the debugging process, you can use single-step debugging to execute the code line by line and view the execution effect of each line of code. Click "Step Over" on the toolbar to execute the current line and jump to the next line.

2. View variable values

During the debugging process, you can view the values ​​of variables to help us understand the code execution process more deeply. In SQL Developer, you can view the values ​​of all current variables in the "Variables" window; in the PL/SQL debugger, you can use the "Display" command to view variable values.

3. Exception handling

During the execution of a stored procedure, exceptions may occur. Using debugging tools can help us quickly locate the problem and handle it. Generally speaking, the try-catch code block can be used to catch exceptions and record the exception information to facilitate our debugging and processing.

4. Skip lines or breakpoints

During the debugging process, there may be some code lines or breakpoints that cannot be debugged (such as exception handling code blocks). For these codes, you can use the "Skip All Breakpoints" or "Skip to Next Breakpoint" command to skip.

In short, using the debugging tools provided by Oracle can help us better diagnose problems in stored procedures and improve development efficiency. When debugging stored procedures, it is recommended to prepare for debugging in advance, master common debugging skills, and pay attention to details, so as to effectively improve development efficiency.

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