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-- GNUmed table change notification functionality
-- ===================================================================
-- license: GPL v2 or later
-- author: Karsten Hilbert
-- ===================================================================
-- force terminate + exit(3) on errors if non-interactive
\set ON_ERROR_STOP 1
-- ===================================================================
comment on table public.notifying_tables is
'All tables that want to send standard notifications
must be recorded in this table. Notification triggers
will be generated automatically for all tables recorded
here.';
-- ===================================================================
create or replace function add_table_for_notifies(name, name, name)
returns boolean
language 'plpgsql'
as '
DECLARE
_relnamespace alias for $1;
_relname alias for $2;
_notification_name alias for $3;
dummy RECORD;
tmp text;
BEGIN
-- does table exist ?
select relname into dummy from pg_class where
relname = _relname and
relnamespace = (select oid from pg_namespace where nspname = _relnamespace)
;
if not found then
tmp := _relnamespace || ''.'' || _relname;
raise exception ''add_table_for_notifies: Table [%] does not exist.'', tmp;
return false;
end if;
-- already queued for notification trigger generation ?
select 1 into dummy from notifying_tables where table_name = _relname and schema = _relnamespace;
if found then
return true;
end if;
-- add definition
insert into notifying_tables (
schema,
table_name,
notification_name
) values (
_relnamespace,
_relname,
_notification_name
);
return true;
END;';
comment on function add_table_for_notifies (name, name, name) is
'Mark given table for notification trigger generator.
Parameters are: (schema, table, signal name)';
-- ===================================================================
create or replace function add_table_for_notifies(name, name)
returns boolean
language SQL
as 'select add_table_for_notifies($1, $2, $2);'
;
comment on function add_table_for_notifies (name, name) is
'Mark given table for notification trigger generator.
Parameters are: (schema, table).
Uses default notify name.';
-- ===================================================================
create or replace function add_table_for_notifies(name)
returns boolean
language SQL
as 'select add_table_for_notifies(''public''::name, $1, $1);'
;
comment on function add_table_for_notifies(name) is
'Mark given table for notification trigger generator.
Parameter is (table).
Assume schema public and use default notify name.';
-- ===================================================================
-- do simple schema revision tracking
delete from gm_schema_revision where filename='$RCSfile: gmNotifications-dynamic.sql,v $';
INSERT INTO gm_schema_revision (filename, version) VALUES('$RCSfile: gmNotifications-dynamic.sql,v $', '$Revision: 1.2 $');
-- ===================================================================
|
