[ic] Matrix options and set_row possible bug?
Peter
peter at pajamian.dhs.org
Thu Jun 22 21:44:09 EDT 2006
On 06/22/2006 02:53 PM, Jon Jensen wrote:
> On Thu, 22 Jun 2006, Peter wrote:
>
>> I may see if I can fix both because the first mentioned bug would pay
>> to help everyone out if I can fix it. I think it's branching wrong in
>> set_row (from looking it should be branching to a different part of
>> the function if only the key is defined, but it's not) so I'll see if
>> I can figure out why. I've got a change in mond of using DEFAULT
>> instead of the '?' placeholder for fields that don't exist in the
>> @fields array, that may go a long ways towards fising it, but it would
>> also require changing the number of bindings or the db will error out
>> because of a mismatch of bindings to ?'s.
>
> I'd like to see a fix for this key-only problem if you fix it.
Well I just figured out the problem. I'm trying to think of the best
solution right now. The problem is in this block of code in set_row:
if ($cfg->{PREFER_NULL}) {
for (keys %{$cfg->{PREFER_NULL}}) {
my $i = $cfg->{COLUMN_INDEX}{$_};
undef $fields[$i] if $fields[$i] eq '';
}
}
I believe that is supposed to set any fields which are set as
PREFER_NULL and have the empty string to NULL. The problem is that the
if $fields[$i] eq '' returns true for undefined as well, so it causes
$fields[i] to explicitly be set to undefined which causes the array to
be expanded out to i-1 elements, and all of the expanded out elements
are set to undefined by default which DBI translates to NULL.
I can think of a few simple solutions, moving this block down below the
next if(scalar @fields == 1) { block would probably fix it and I'm
inclined to do that which will probably be enough to fix the problem as
long as @fields either contains only one element or a number of elements
to equal the number of fields in the table. If set_row is ever called
with @fields having somethign in between then there will still be problems.
Peter
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