Thanks a lot, would you please be so kind to tell me more about what is top 
level query??




------------------ Original message ------------------
From: "Pavel Stehule"; 
Sendtime: Thursday, May 10, 2018 6:38 PM
To: "a"<372660...@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 <372660...@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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