How to know the date of modification of an SP? - postgresql

Question

Is it possible to know the date of modification and / or creation of an SP in PostgreSQL 9.4?
I need to identify them to upload them next Deploy.-

Answer 1

PostgreSQL has not this functionality. You can create own table and update it from event triggers.
create table updates(proc regprocedure primary key, t timestamp);
create or replace function event_trigger_for_ddl_command_end()
returns event_trigger as $$
declare obj record;
begin
for obj in select * from pg_event_trigger_ddl_commands()
loop
if obj.classid = 'pg_proc'::regclass then
insert into updates values(obj.objid, current_timestamp)
on conflict (proc) do update set t = current_timestamp
where updates.proc = excluded.proc;
end if;
end loop;
end;
$$ language plpgsql;
create event trigger trigger_for_ddl_command_end
on ddl_command_end
execute procedure event_trigger_for_ddl_command_end();
create or replace function fx(a int) returns int as $$ select 1 $$ language sql;
postgres=# select * from updates ;
+-------------+----------------------------+
| proc | t |
+-------------+----------------------------+
| fx(integer) | 2017-11-22 14:21:11.367036 |
+-------------+----------------------------+
(1 row)
-- alternative code without INSERT ON CONFLICT
create or replace function event_trigger_for_ddl_command_end()
returns event_trigger as $$
declare obj record;
begin
for obj in select * from pg_event_trigger_ddl_commands()
loop
if obj.classid = 'pg_proc'::regclass then
begin
update updates set t = current_timestamp
where proc = obj.objid;
if not found then
begin
insert into updates values(obj.objid, current_timestamp);
exception when unique_violation then
update updates set t = current_timestamp
where proc = obj.objid;
end;
end if;
end if;
end loop;
end;
$$ language plpgsql;