Re: How to get a notification

On 2/7/25 11:02 AM, Igor Korot wrote:
> Hi, Adrian,
>
> On Fri, Feb 7, 2025 at 11:07 AM Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com> wrote:
>>
>> On 2/5/25 23:21, Igor Korot wrote:
>>> Hi, ALL,
>>> In my code I'm running following:
>>>
>>> queries.push_back( L"CREATE FUNCTION
>>> __watch_schema_changes() RETURNS event_trigger LANGUAGE plpgsql AS $$
>>> BEGIN NOTIFY tg_tag; END; $$;" );
>>> queries.push_back( L"CREATE EVENT TRIGGER
>>> schema_change_notify ON ddl_command_end WHEN TAG IN(\'CREATE TABLE\',
>>> \'ALTER TABLE\', \'DROP TABLE\', \'CREATE INDEX\', \'DROP INDEX\')
>>> EXECUTE PROCEDURE __watch_schema_changes();" );
>>>
>>> My questions are:
>>> 1 Is there a better way to get notification about CREATE/ALTER/DROP TABLE?
>>
>> An alternate solution:
>>
>> https://www.pgaudit.org/
>>
>> Whether it is better or not is something you will need to decide.
>>
>>> 2. How do I receive notification abut the event with the object name?
>>
>> Use information from here?:
>>
>> https://www.postgresql.org/docs/current/functions-event-triggers.html#PG-EVENT-TRIGGER-DDL-COMMAND-END-FUNCTIONS
>
> Thx for the link
> So basically all I need to do is to call
>
> SELECT pg_event_trigger_ddl_commands ()

And then unpack the information it returns.

>
> right?
>
> In both ODBC amd libpq interfaces?

It is not about the interface it is about, from link above:

"pg_event_trigger_ddl_commands returns a list of DDL commands executed
by each user action, when invoked in a function attached to a
ddl_command_end event trigger."

>
> Thank you.
>
>
>
>>
>>>
>>> Thank you.
>>>
>>>
>>
>> --
>> Adrian Klaver
>> adrian(dot)klaver(at)aklaver(dot)com
>>

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com