| From: | Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr> |
|---|---|
| To: | Daniel Verite <daniel(at)manitou-mail(dot)org> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Corey Huinker <corey(dot)huinker(at)gmail(dot)com>, Greg Stark <stark(at)mit(dot)edu>, Erik Rijkers <er(at)xs4all(dot)nl>, Robert Haas <robertmhaas(at)gmail(dot)com>, Jim Nasby <Jim(dot)Nasby(at)bluetreble(dot)com>, PostgreSQL <pgsql-hackers(at)postgresql(dot)org>, pgsql-hackers-owner(at)postgresql(dot)org |
| Subject: | Re: \if, \elseif, \else, \endif (was Re: PSQL commands: \quit_if, \quit_unless) |
| Date: | 2017-02-23 17:52:37 |
| Message-ID: | alpine.DEB.2.20.1702231844460.21598@lancre |
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| Thread: | |
| Lists: | pgsql-hackers |
Hello Daniel,
>> Ah, I see why *that* wants to know about it ... I think. I suppose you're
>> arguing that variable expansion shouldn't be able to insert, say, an \else
>> in a non-active branch? Maybe, but if it can insert an \else in an active
>> branch, then why not non-active too? Seems a bit inconsistent.
>
> Are we sold on the idea that conditionals should be implemented
> by meta-commands, rather than for example terminal symbols of
> a new grammar on top of the existing?
I would say that this already exists server-side, and it is named
PL/pgSQL:-)
I think that once psql has started with \xxx commands, then client-side
extensions must stick with it till the end of time.
--
Fabien.
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