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Message-ID: <5949efc2-64a0-4bb3-b837-2c7b90c3745b@aklaver.com>
Date: Fri, 7 Feb 2025 11:13:16 -0800
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Subject: Re: How to get a notification
To: Igor Korot <ikorot01@gmail.com>
Cc: "pgsql-generallists.postgresql.org" <pgsql-general@lists.postgresql.org>
References: <CA+FnnTw1fUZz8=4gqKFgfXw2RePNxpy1JjcPtD2w3vh6mdXhQw@mail.gmail.com>
 <bf759988-5f40-4280-855e-2d0cbe2f41b0@aklaver.com>
 <CA+FnnTwe-JrnToK1tZD9J+ZMMM571cSvX3tyf0i3feL7QWSDOA@mail.gmail.com>
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From: Adrian Klaver <adrian.klaver@aklaver.com>
In-Reply-To: <CA+FnnTwe-JrnToK1tZD9J+ZMMM571cSvX3tyf0i3feL7QWSDOA@mail.gmail.com>
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On 2/7/25 11:02 AM, Igor Korot wrote:
> Hi, Adrian,
> 
> On Fri, Feb 7, 2025 at 11:07 AM Adrian Klaver <adrian.klaver@aklaver.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.klaver@aklaver.com
>>

-- 
Adrian Klaver
adrian.klaver@aklaver.com