Re: getting case count via PSPP::Perl

[Ben Pfaff]

Thank you.

Rob Messer <address@hidden> writes:

> Ok, I have done that (although I didn't see a category called
> "wishlist" so I just put as "other", since it is really a
> feature request and not a bug).  Thanks.
>
> On May 23, 2011, at 10:51 AM, Ben Pfaff wrote:
>
>> It would be ideal if you would file this as a "wishlist" bug in
>> the tracker at https://savannah.gnu.org/bugs/?group=pspp.  That
>> way the request will not get lost.
>> 
>> Rob Messer <address@hidden> writes:
>> 
>>> John,
>>> 
>>> Ok, that is good to know.  So I guess consider this a feature
>>> request to add that to some future release.  If the method
>>> sometimes returns undef because the file header doesn't have
>>> the info that then is reasonable enough, but at least we could
>>> show progress in most cases.  Thank you,
>>> 
>>> Rob
>>> 
>>> On May 22, 2011, at 1:20 AM, John Darrington wrote:
>>> 
>>>> It should be very straightforward.   Most .sav files contain a header 
>>>> field 
>>>> indicating the number of cases.  However, occasionally we've encountered 
>>>> files
>>>> which don't have this field.  So the perl program would have to be 
>>>> prepared to
>>>> handle this case.
>>>> 
>>>> J'
>>>> 
>>>> On Fri, May 20, 2011 at 11:16:26AM -0700, Rob Messer wrote:
>>>>    We have been using the PSPP::Perl interface to read data from .sav 
>>>> files into our database, and it works very well for that purpose.
>>>> 
>>>>    Sometimes the files we read are rather large, and so it takes some time 
>>>> to load the data.  We like to be able to show progress to the user who is 
>>>> loading their data, so we need to know the total number of records to be 
>>>> loaded.  But right now, there doesn't appear to be any way to get the 
>>>> total number of cases other than scanning through all the records.  Is 
>>>> there any way to add a method to the Perl API so that we could do 
>>>> something like this:
>>>> 
>>>>    my $pspp = PSPP::Reader->open($file);
>>>>    my $case_count = $pspp->get_num_cases(); 
>>>> 
>>>>    # then load cases to database and show percent complete at various 
>>>> points...
>>>> 
>>>> 
>>>>    Thanks,
>>>> 
>>>>    Rob
>>>> 
>>> 
>>> 
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>>> 
>> 
>> -- 
>> Ben Pfaff 
>> http://benpfaff.org
>
>

-- 
Ben Pfaff 
http://benpfaff.org