Re: [HACKERS] psql - add special variable to reflect the last query status

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От Tom Lane
Тема Re: [HACKERS] psql - add special variable to reflect the last query status
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Msg-id 4415.1505144824@sss.pgh.pa.us
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Ответ на Re: [HACKERS] psql - add special variable to reflect the last querystatus  (Fabien COELHO <coelho@cri.ensmp.fr>)
Ответы Re: [HACKERS] psql - add special variable to reflect the last querystatus  (Fabien COELHO <coelho@cri.ensmp.fr>)
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Fabien COELHO <coelho@cri.ensmp.fr> writes:
> Small v7 update, sorry for the noise.

Hm.  Looking closer at this, I see that it doesn't work so well after all
to put the variable-setting code in ProcessResult: that fails to cover the
ExecQueryUsingCursor code path.  And it also fails to cover DescribeQuery,
which arguably should set these variables as well -- certainly so if it
gets a failure.  Maybe you could create a small subroutine along the lines
of SetResultVariables(PGresult *result, bool success) for all three places
to call.  (ProcessResult certainly has already decided whether it's got a
success, and I think the other paths would know that as well, so no need
to re-extract it from the PGresult.)

I think you're overly optimistic to believe that every failure will
have a SQLSTATE; I don't think that's true for libpq-reported errors,
such as connection loss.

Using upper-case TRUE/FALSE for the values of ERROR seems a bit
ugly to me; we generally use lower case for other variable values,
so I'd go with true/false.
        regards, tom lane


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