Re: info about patch: using parametrised query in psql

2009/12/25 Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>> I think maybe what we need here is a piece of syntax to indicate that a
>> specific parameter should be substituted after first being passed
>> through PQescapeStringConn.
>
> I agree that a global flag that changes the behavior of :foo is a
> seriously bad idea.  Alternate syntax would be much better, but how
> exactly can we shoehorn that in?  Maybe something like
>        :!foo

there are two quoting styles, so we need two syntax. I proposed

:[var] and :{var} - for ident quoting and literal quoting.
Theoretically we could to use :(var) for bytea escaping. :!foo isn't
good idea. It is related to negation operator. Bracket or parenthesis
are good readable and far to some custom pg operators.

Regards
Pavel Stehule

> ie put some non-letter flags between the : and the variable name.
> It would obviously not work to use ::foo, but I think many other
> punctuation characters would be safe (would not conflict with any
> likely SQL usage).  We could have a couple of different flags to
> signal whether you want single or double quoting of the variable
> value.
>
>                        regards, tom lane
>