Re: libpq: how to get error code (not message)

On Thu, Dec 02, 2004 at 03:59:46PM -0800, X X wrote:

> > I think you're looking for PQresultErrorField()
> > called with the
> > fieldcode argument set to PG_DIAG_SQLSTATE.
>
> Thanks for your reply. This is exactly what I was
> looking for, but the libpq documentation does not
> mention it (at least I did not find).

Appendix A says:

All messages emitted by the PostgreSQL server are assigned
five-character error codes that follow the SQL standard's
conventions for "SQLSTATE" codes.

The PQresultErrorField() function is documented in the libpq
"Command Execution Functions" section:

http://www.postgresql.org/docs/7.4/static/libpq-exec.html#AEN20619

The documentation says:

The following field codes are available:
...

PG_DIAG_SQLSTATE
The SQLSTATE code for the error (see Appendix A). Not localizable.
Always present.

--
Michael Fuhr
http://www.fuhr.org/~mfuhr/