Re: psql - add ability to test whether a variable exists

2017-08-26 19:55 GMT+02:00 Fabien COELHO <coelho@cri.ensmp.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.