libpq and TOO MANY CONNECTIONS

Dmitriy Igrishin <dmitigr@gmail.com> writes:

It seams, that all of the error codes should be obtained by calling
PQresultErrorField().
But this function works only with results. So in what situations
TOO MANY CONNECTIONS error may be thrown after successfully connection ? :)

It isn't.

The lack of a way to report a SQLSTATE code for a connection failure is
an API shortcoming in libpq; it's not the backend's problem.

regards, tom lane