| From: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
|---|---|
| To: | Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr> |
| Cc: | PostgreSQL Developers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: psql - add ability to test whether a variable exists |
| Date: | 2017-08-26 18:09:27 |
| Message-ID: | CAFj8pRDtF+wwwjnKX1B3DAmqqfZryXNfG-3G93UeywMv9tDOLg@mail.gmail.com |
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| Lists: | pgsql-hackers |
2017-08-26 19:55 GMT+02:00 Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr>:
>
> Any colon prefixed syntax can be made to work because it is enough for the
>> lexer to detect and handle... so
>>
>> :{defined varname}
>>
>> may be an option, although I do not like the space much because it adds
>> some fuzzyness in the lexer which has to process it. It is probably doable,
>> though. I like having a "?" because there is a question. Other
>> suggestions somehow in line with your proposal could be
>> :{?varname}
>> :{varname?}
>> what do you think?
>>
>
> Here is a version with the :{?varname} syntax.
It looks much better for me.
Regards
Pavel
>
>
> --
> Fabien.
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