Q
Problem solve Get help with specific problems with your technologies, process and projects.

What are user-defined exceptions?

What are user-defined exceptions?

What are user-defined exceptions? Can you give some examples?

In PL/SQL, when an error occurs, the PL/SQL block (stored procedure, trigger, etc.) will generate an error and terminate. However, it is often desirable for the PL/SQL block to perform some action when it reaches an error. For instance, you may open a cursor and fetch results only to find no rows of data returned from the cursor. This is the NO_DATA_FOUND exception. If no data is found, then your PL/SQL block may want to issue an message to the application. The exception handler is the routine you code in your PL/SQL block to handle the error in the manner you choose.

Out of the box, Oracle comes with many predefined exceptions. However, your application may need other exception handling. You are free to code your own exceptions, or user-defined exceptions. As an example, consider a database for a university. You may have a stored procedure where a student drops a class. The student is not allowed to drop the class after the first three weeks of the semester. A user-defined exception in the stored procedure would verify that this condition is being met. If the condition is not met, the user-defined exception is raised.

This document gives more details on user-defined exceptions, along with a few examples.

Dig Deeper on Using Oracle PL-SQL

Have a question for an expert?

Please add a title for your question

Get answers from a TechTarget expert on whatever's puzzling you.

You will be able to add details on the next page.

Start the conversation

Send me notifications when other members comment.

Please create a username to comment.

-ADS BY GOOGLE

SearchDataManagement

SearchBusinessAnalytics

SearchSAP

SearchSQLServer

TheServerSide.com

SearchDataCenter

SearchContentManagement

SearchHRSoftware

Close