How to stop a process from running and display a message

I have a button that inserts data into a table based on bind variable selected on the page. I would like to add code to that button that will check to see if certain data already exists in the table, for that bind variable, and if that data already exists, stop the process and display a message that says "you have already inserted that information - bla bla bla". If not, continue inserting. What would be the best way to do this?
Currently, the button is a plsql that inserts the data.
Any help or examples would be greatly appreciated!
mholman
Edited by: user10488561 on Jul 27, 2009 8:48 AM

Use a validation process for that. If the validation fails (data exists) the processes will not be run. If it doesn't then the processing will continue.
Denes Kubicek
http://deneskubicek.blogspot.com/
http://www.opal-consulting.de/training
http://apex.oracle.com/pls/otn/f?p=31517:1
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