Re: How do I get the SQL statement in a trigger? - Mailing list pgsql-general

Querying over pg_stat_activity with clauses in a trigger can be quite
expensive if your write transaction rate is high.


You may want to look into the current_query() function documented at
https://www.postgresql.org/docs/current/static/functions-info.html








On 10/05/18 11:44, Pavel Stehule wrote:
>
>
> 2018-05-10 12:42 GMT+02:00 a <372660931@qq.com <mailto:372660931@qq.com>>:
>
>     Thanks a lot, would you please be so kind to tell me more about what
>     is top level query??
>
>
> for example - if you run some queries from PLpgSQL functions (triggers),
> then these queries are not top queries.
>
> Regards
>
> Pavel
>
>
>
>     ------------------ Original message ------------------
>     *From:* "Pavel Stehule"__;
>     *Sendtime:* Thursday, May 10, 2018 6:38 PM
>     *To:* "a"<372660931@qq.com <mailto:372660931@qq.com>>;
>     *Cc:* "pgsql-general"__;
>     *Subject:* Re: How do I get the SQL statement in a trigger?
>
>     Hi
>
>     2018-05-10 12:23 GMT+02:00 a <372660931@qq.com
>     <mailto:372660931@qq.com>>:
>
>         Hi I would like to write a trigger that recorded every sql
>         statement under the effected entry. So if it is possible to
>         retrieve the sql statement within a trigger??
>
>
>     You can read a tom command from pg_stat_activity table
>
>       postgres=# select query from pg_stat_activity where pid =
>     pg_backend_pid();
>     +------------------------------------------------------------------+
>     |                              query       |
>     +------------------------------------------------------------------+
>     | select query from pg_stat_activity where pid = pg_backend_pid(); |
>     +------------------------------------------------------------------+
>     (1 row)
>
>     But this information is available only for top level query.
>
>     Regards
>
>     Pavel
>
>

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Regards

Fabio Ugo Venchiarutti
Data Services Department
Ocado Technology

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