How to catch oracle stored procedure exceptions

Oracle stored procedures provide EXCEPTION block for catching exceptions. The steps are as follows: Use EXCEPTION block to specify the exception type: WHEN EXCEPTION_NAME THEN provides processing code: execute exception handling operations Use the WHEN OTHERS clause to handle unspecified exceptions: provide a general processing mechanism

Oracle stored procedure exception capture

Oracle stored procedures provide a convenient way to organize and reuse SQL code. However, an error or an exception may occur during execution. To ensure the robustness and reliability of your application, it is crucial to be able to catch and handle these exceptions.

Syntax to catch exceptions

Oracle provides EXCEPTION blocks to catch exceptions in stored procedures. Its syntax is as follows:

 <code class="sql">BEGIN -- 代码块EXCEPTION WHEN EXCEPTION_NAME THEN -- 异常处理代码WHEN OTHERS THEN -- 其他异常处理代码END;</code>

Use exception handling blocks

Follow the following steps to use the exception handling block to capture exceptions in stored procedures:

1. Use the EXCEPTION block to specify the exception to be caught: for example, WHEN NO_DATA_FOUND THEN .
2. Provides processing code to execute: for example, displaying an error message or rolling back a transaction.
3. Use the WHEN OTHERS clause to handle all other unspecified exceptions: This is a common way to catch unanticipated exceptions.

Example

Consider the following stored procedure, which gets the department name in the department table:

 <code class="sql">CREATE PROCEDURE GetDepartmentName ( IN department_id NUMBER ) AS BEGIN SELECT department_name FROM departments WHERE department_id = department_id; EXCEPTION WHEN NO_DATA_FOUND THEN DBMS_OUTPUT.PUT_LINE('No data found for specified department ID.'); WHEN OTHERS THEN DBMS_OUTPUT.PUT_LINE('Error occurred while fetching department name.'); END;</code>

In this example, the WHEN NO_DATA_FOUND clause is used to catch NO_DATA_FOUND exception, while the WHEN OTHERS clause is used to catch all other unexpected exceptions.

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