Is it possible to get username information while writing trigger?

From: a <372660931(at)qq(dot)com>
To: pgsql-general <pgsql-general(at)postgresql(dot)org>
Subject: Is it possible to get username information while writing trigger?
Date: 2018-05-07 07:39:37
Message-ID: tencent_5889CA742370FDD1149BA470@qq.com
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Hey:

What I want is to add a log entry at the last column of each row, which will record the history update, insert automatically when relative statement is processed.

I have read the documentation on triggers, which helps a lot. However, I may have few more extra requirement to complete my wishes:

1, I would like to get the username of who executed the statement;

2, I would like to get the column name that is being updated;

If it is possible and how should I do it??

Thanks a lot!

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