Re: \if, \elseif, \else, \endif (was Re: [HACKERS] PSQL commands: \quit_if, \quit_unless)

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От Tom Lane
Тема Re: \if, \elseif, \else, \endif (was Re: [HACKERS] PSQL commands: \quit_if, \quit_unless)
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Msg-id 25970.1486141835@sss.pgh.pa.us
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Ответ на Re: \if, \elseif, \else, \endif (was Re: [HACKERS] PSQL commands:\quit_if, \quit_unless)  (Corey Huinker <corey.huinker@gmail.com>)
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Corey Huinker <corey.huinker@gmail.com> writes:
> Well played (again). That one ranks up there with "and don't call me
> Shirley." I meant in the specific psql-context, does it do anything other
> than (attempt to) terminate sent-but-not-received SQL queries?

It also flushes the input buffer.  I think it is probably reasonable to
let it cancel interactive \if state as well.  A useful thought-experiment
is to ask what behavior you'd want if we had metacommand loops ... and
I think the answer there is pretty obvious: you'd want control-C to kill
a loop.

I'm less sure about what it ought to do when control is somewhere in
a script file.  I *think* we have things set up to kill execution of
script files altogether, in which case we have the answer a fortiori.
If not, there's room for discussion.
        regards, tom lane



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