Обсуждение: eval in plpgsl

          Hello,

is there any variable variable syntax or function in plpgsql? I didn't
find it.

I mean something like: magic(''new.'' || TG_ARGV[0]) = 5;

       Mage

Mage wrote:
>           Hello,
>
> is there any variable variable syntax or function in plpgsql? I didn't
> find it.
>
> I mean something like: magic(''new.'' || TG_ARGV[0]) = 5;

Uh, we have EXECUTE, but I don't know if will allow you to set a local
variable.  Maybe you can do:

    EXECUTE SELECT ''new.''|| TG_ARGV[0] INTO new var

--
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Bruce Momjian wrote:

>
>Uh, we have EXECUTE, but I don't know if will allow you to set a local
>variable.  Maybe you can do:
>
>
execute doesn't support select into

       Mage

--- Mage <mage@mage.hu> wrote:
> Bruce Momjian wrote:
>
> >
> >Uh, we have EXECUTE, but I don't know if will allow
> you to set a local
> >variable.  Maybe you can do:
> >
> >
> execute doesn't support select into

It does, if you use the "for variablename in execute
..." syntax.  Which may seem like overkill for setting
just one value, but at least it will work for you.

Or you could investigate other procedural languages,
which may offer the capability you want.  I believe
pltcl does, and perhaps plpython also.

>
>        Mage
>
>
>
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> broadcast)---------------------------
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settings


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Bruce Momjian wrote:

> Mage wrote:
>>           Hello,
>>
>> is there any variable variable syntax or function in plpgsql? I didn't
>> find it.
>>
>> I mean something like: magic(''new.'' || TG_ARGV[0]) = 5;
>
> Uh, we have EXECUTE, but I don't know if will allow you to set a local
> variable.  Maybe you can do:
>
>     EXECUTE SELECT ''new.''|| TG_ARGV[0] INTO new var
>

It does not. This really isn't a full blown scripting language. If one
wants that, there is PL/Tcl.


Jan

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