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Oracle DBMS_ALERT

The Oracle DBMS_ALERT supports asynchronous notification of database events.
DBMS_ALERT contains the following subprograms: REGISTER, REMOVE, REMOVEALL, SET_DEFAULTS, SIGNAL, WAITANY, WAITONE.

DBMS_ALERT.REGISTER

CREATE OR REPLACE PROCEDURE 
register (p_register in varchar2) 
IS
BEGIN
DBMS_ALERT.REGISTER('alert_name'); 
END;

DBMS_ALERT.REMOVE

CREATE OR REPLACE PROCEDURE 
remove (p_remove in varchar2) 
IS
BEGIN
DBMS_ALERT.REMOVE('alert_name'); 
END;

DBMS_ALERT.SIGNAL

CREATE OR REPLACE PROCEDURE 
signal (
	p_name in varchar2,
	p_message in varchar2
IS
BEGIN
	DBMS_ALERT.SIGNAL('Alert_name', 'The message of alert'); 
END;

DBMS_ALERT.WAITONE

Declare
	v_status varchar2(200);
	v_message    varchar2(1200);
Begin
dbms_alert.waitone( 
	name    => 'AlertName',
	message => v_message,
	status  => v_status,
	timeout => dbms_alert.maxwait 
);
If v_status = 'NO' Then
	dbms_output.put_line( 'The message is ' || v_message );
End If;
End;

Filed Under: Oracle

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