Re: proposal - assign result of query to psql variable

Hello

fast reply

2012/10/14 Tom Lane <tgl@sss.pgh.pa.us>:
> Pavel Stehule <pavel.stehule@gmail.com> writes:
>> [ gset_08.diff ]
>
> In the course of adding a new backslash command, this patch manages to
> touch:
>
> * the main loop's concept of what types of backslash commands exist
>   (PSQL_CMD_NOSEND ... what's the point of that, rather than making
>   this work the same as \g?)
> * SendQuery's concept of how to process command results (again, why
>   isn't this more like \g?)

If I remember, I had to do because I had a problem with shell, but I
have to diagnose it again

> * ExecQueryUsingCursor's concept of how to process command results
>   (why? surely we don't need \gset to use a cursor)

There was two possibilities, but hardly non using cursor is better way

> * the psql lexer (adding a whole bunch of stuff that probably doesn't
>   belong there)

??

> * the core psql settings construct (to store something that is in
>   no way a persistent setting)
>

??

> Surely there is a less ugly and invasive way to do this.  The fact
> that the reviewer keeps finding bizarre bugs like "another backslash
> command on the same line doesn't work" seems to me to be a good
> indication that this is touching things it shouldn't.

 - all these bugs are based on lexer construct. A little modification
of lexer is possible

Regards

Pavel

>
>                         regards, tom lane