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libpq: how to retrieve query result?

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To: pgsql-general@xxxxxxxxxxxxxx
Subject: libpq: how to retrieve query result?
From: Вячеслав Блинников <slavmfm@xxxxxxxxx>
Date: Mon, 17 Jan 2011 23:00:52 +0300

I retrieve asynchronous queries results using PQgetResult() which returns NULL not in case of some error, but when results end - so there is no way to know if database responded successfully or there happened some error?
For example, error can happen when column names are miswritten.

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