/*****************************************************************************
*
* Filename         - $Workfile:   log_table_triggers.sql  $
*
*                     Name              Date      Version     CR Number
* Author           - See revision history below.
* Last Update      - See revision history below.
*
* Project Name     - TAGTRAK(Oracle Database)
*
* Source Code
* Identifier       - 0/3/300/8010/112
*
* Design Spec
* Section          - 
*
* Contents         -  Live Schema: triggers for log_table table
*
* Language         - Oracle SQL*Plus script
*
* Classification   - Commercial In Confidence
*
*          (c) Ultra Electronics Limited, 1997
*
*****************************************************************************/
/****************************************************************************
* @(#)$Workfile:   log_table_triggers.sql  $  $Revision:   1.4  $
*
* Revision History
*
* Note that user tagtrak is many users. For these users the user
* name is entered as the last line in the change description.
*
* $Log:   /pvcsarch/db_ora/db/source/live/triggers/log_table_triggers.svl  $
* 
*    Rev 1.4   21 Jun 2001 15:04:28   tagtrak
* OR:
* CR:
* Re-baseline version 4.0.0 to include patches.
* 
*    Rev 1.3   02 Apr 1998 19:46:20   tagtrak
* OR:
* CR:
* REV:
* Initial Issue
* See label for concession
* 
*    Rev 1.2   26 Feb 1998 11:42:36   tagtrak
* OR:
* CR:
* REV:
* Initial core product version
* 
*    Rev 1.1   15 Jan 1998 13:39:06   tagtrak
* OR: OR11101, TN13, TN15
* CR:
* REV:
* Phase 2C to Phase 3 upgrade plus code review actions and resolving some technical issues.
* 
* 
*    Rev 1.0   22 Oct 1997 16:38:34   tagtrak
* OR:
* CR:
* REV:
* Initial check-in
*
****************************************************************************/



create or replace trigger ti_log_table
before insert on log_table
for each row
begin

	/*
	 * - Get the next sequential number for the record_id
	 */
    
	select
		log_id.nextval
	into
		:new.record_id
	from
		dual;
end;
/

create or replace trigger tu_log_table
before update on log_table
for each row
begin

	/*
	 * For each row of an update on the log_table
	 * - Check the log_time, reason and user_id are OK
	 */
	
	if (:old.log_time != :new.log_time) then
		 raise_application_error( -20018, 'non modifiable column cannot be modified.');
	end if;
	
	if (:old.reason != :new.reason) then
		raise_application_error( -20018, 'non modifiable column cannot be modified.');
	end if;
	
	
	
	if (:old.user_id != :new.user_id) then
		 raise_application_error( -20019, 'cannot modify parent code in child table.');
	end if;
end;
/
