Re: Anonymous code block with parameters

Hi

2014-09-16 8:38 GMT+02:00 Kalyanov Dmitry <kalyanov(dot)dmitry(at)gmail(dot)com>:

> I'd like to propose support for IN and OUT parameters in 'DO' blocks.
>
> Currently, anonymous code blocks (DO statements) can not receive or
> return parameters.
>
> I suggest:
>
> 1) Add a new clause to DO statement for specifying names, types,
> directions and values of parameters:
>
> DO <code> [LANGUAGE <lang>] [USING (<arguments>)]
>
> where <arguments> has the same syntax as in
> 'CREATE FUNCTION <name> (<arguments>)'.
>
> Example:
>
> do $$ begin z := x || y; end; $$
> language plpgsql
> using
> (
> x text = '1',
> in out y int4 = 123,
> out z text
> );
>
> 2) Values for IN and IN OUT parameters are specified using syntax for
> default values of function arguments.
>
> 3) If DO statement has at least one of OUT or IN OUT parameters then it
> returns one tuple containing values of OUT and IN OUT parameters.
>
> Do you think that this feature would be useful? I have a
> proof-of-concept patch in progress that I intend to publish soon.
>
>
shortly

+1 parametrization of DO statement

-1 OUT parameters for DO - when you need OUTPUT, then use a function. A
rules used for output from something are messy now, and I strongly against
to do this area more complex. Instead we can define temporary functions or
we can define real server side session variables.

Pavel

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