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User-Defined Exceptions
Oracle Tips by Burleson
 

PL/SQL allows developers to define their own exceptions. This is a useful method of returning a specific status to calling procedures and functions. Giving user-defined exceptions meaningful names helps make code easier to understand. User-defined exceptions must be explicitly raised through the use of the RAISE statement. Listing 2.16 illustrates how user-defined exceptions are declared and raised.

Listing 2.16 A user-defined exception.

DECLARE
   xStudentNotEligibleForAid    EXCEPTION;
 
...
IF <condition> THEN
   RAISE xStudentNotEligibleForAid;
END IF;

An exception raised using the RAISE statement is processed just like any exception raised by Oracle.

The OTHERS Exception Handler

The OTHERS exception handler functions as a catch-all exception handler for a PL/SQL block. The OTHERS exception handler is used as follows:

WHEN OTHERS THEN
     System_Error_Handler (<parameters>);

Care must be taken when raising user-defined exceptions in a block that uses the OTHERS exception handler. If the user-defined exception is to be raised to a calling procedure, an exception handler for the user-defined exception should be defined that explicitly re-raises the exception, as follows:

EXCEPTION
   WHEN StudentNotEligibleForAid THEN
        RAISE;
   WHEN OTHERS THEN
        System_Error_Handler (<parameters>);

The OTHERS exception handler should follow any other exception handlers. Any exception not handled by another exception handler is handled by the OTHERS exception handler.

    

This is an excerpt from the book "High Performance Oracle Database Automation" by Jonathan Ingram and Donald K. Burleson, Series Editor.

  
 

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