UniBasic Commands Reference - Rocket Software

SUBROUTINE (Delete Trigger)
Syntax
SUBROUTINE trigname(execstat, dictflag, filename, record.ID.expr)
FUNCTION trigname(dictflag, filename, record.ID.expr)
Description
A UniBasic subroutine or function serves as the DELETE trigger that is executed
when you attempt to delete a record in the subject file. The SUBROUTINE or
FUNCTION definition must be the first line in the UniBasic trigger subroutine.
You must include a RETURN statement in the function:
RETURN [execstat]
Points to Remember
Remember the following items when writing a subroutine that is triggered by a user
attempting to delete a record:
1-884 UniBasic Commands Reference
When you attempt to delete a record, UniData calls the trigger, passing the
file name, DICT if dictionary file, record ID, and the input value before
deleting the record. The subroutine returns the execution status.
If the delete request fails the constraint, the subroutine must return a status
of 0. If the request passes, the return must be 1.
Tip: You can call a C routine from the UniBasic subroutine or function that is called
from a trigger.