Suppress a message

Question

Hello,
I use the triggers "ON MESSAGE" and "ON ERROR" and write null in the triggers to suppress the messages. So it works fine. But if I change for example make a an alter table I get the Message if I want to save the changes! How can I suppress this Message, too!
thanks

Answer 1

I'm not sure what you mean by null trigger, but here is a message handler I created that has proven effective for all my needs so far.
At the form level...
create trigger for 'ON-ERROR'
PR_HANDLE_MESSAGE( 'ERROR' );
create trigger for 'ON_MESSAGE'
PR_HANDLE_MESSAGE( 'MESSAGE' );
In the Program Units...
.PROCEDURE PR_HANDLE_MESSAGE (MSG_TYPE VARCHAR2) IS
. ALERT_BTN NUMBER;
. errtype VARCHAR2(3) := MESSAGE_TYPE;
. errcod NUMBER := MESSAGE_CODE;
. errtxt VARCHAR2(80) := MESSAGE_TEXT;
.BEGIN
.--* Generic system and error messages handler.
. IF errcod IN ( 40100, 40102, 41000, 40200, 41051 ) THEN
. -- Suppress these user messages
. ----------------------------------------------------------- -- ErrNo Message text
. -- 40100 At first record.
. -- 40102 Record must be entered or deleted first
. -- 40200 Field is protected against update
. -- 40212 Invalid value for field xxxx.
. -- 40350 Query caused no records to be retreived
. -- 40400 Transaction complete. N records saved.
. -- 40401 No changes to save
. -- 41000 This function not currently available
. -- 41026 Field does not understand operation
. -- 41045 Cannot find item: invalid ID.
. -- 41051 You can't create records here
. NULL;
. ELSIF errcod IN (-1) THEN
. -- Show these on status line
. -- ErrNo Message text
. MESSAGE(errtype||'-'||to_char(errcod)||': '||errtxt);
. ELSE
. IF MSG_TYPE = 'ERROR' THEN
. MESSAGE( errtype||'-'||to_char(errcod)||': '||errtxt );
. RAISE FORM_TRIGGER_FAILURE;
. ELSE
. MESSAGE( errtype||'-'||to_char(errcod)||': '||errtxt);
. END IF;
. END IF;
.END;