[ic] PREFIX-exec bar_link (Was: coordinated searches including a profile?)
Mon, 20 Nov 2000 10:59:29 -0500
Quoting Doug Alcorn (email@example.com):
> I see some code in the interchange base dir catalog_before.cfg. Does
> the PREFIX-exec tag just execute some arbitrary pre-defined
> subroutine? If so, that is good to know.
Yes, that is it. It can be pre-defined by Sub, or defined in the page
Both are much faster than using [calc|perl|PREFIX-calc] [/calc|perl|PREFIX-calc]
as the code is only compiled once (and only one Safe object need be generated).
> I'm looking at the code for
> bar_link and don't understand what all gets passed in. I assume that
> [PREFIX-exec bar_link]area[/PREFIX-exec] passes 'area' as the first
> argument. What is the rest? From the bar_link code, it looks like
> some kind of array. Can someone point me to the documentation for
> PREFIX-exec? I've looked on the page titled "Looping tags and
> Sub-tags" with no success.
There are no docs published yet. Basically, the container text is
$_, the row returned from the search (all mv_return_fields) is
the array reference passed as $_. So if you did
[query list=1 sql="
SELECT sku, price, description
WHERE category = 'pliers'
my ($scalar, $ary) = @_;
my $el = scalar @$ary;
my $ptr = $my_sub_count++;
return "inc $scalar, pointer $ptr, elements $el, price $ary->\n";
it would be equivalent to
my_sub('1', ['os28062', '24.99', 'Electricians Plier Set'] );
my_sub('2', ['os28065', '18.99', 'Mechanics Pliers']);
and would return:
inc 1, pointer 0, elements 3, price 24.99
inc 2, pointer 1, elements 3, price 18.99
You could have as easily defined my_sub in catalog.cfg with Sub.
I will be producing a "Tips and Tricks" soon that is pointed toward speeding
up slow search pages with this and similar techniques.
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