There's major issues with HTML::Pager I see up front: it wants the whole data set up front, and it uses CGI.pm, not quite the thing when you have HTML::Template, IMO.

Since retrieving the entire data set every time through is grossly inefficient, you likely will end up doing one or both of two things: retrieving just the rows you need or caching the results someplace.

Many dialects of SQL will let you specify the rows you need. For instance Mysql has a LIMIT clause: 

SELECT * FROM bannerlog.log LIMIT 100, 100;

[download]

which says return only the rows starting at the 101st row and going 100 rows from there.

If we were saving state using HTML form variables and using CGI::Request to fetch form parameters (using mod_perl, I'd use Apache::Request) our code would then end up something like: 

use CGI::Request;
my $req = new CGI::Request;
my $rows_per_page = 100;
my ($first_row, $command) = map { $req->param($_) } 
                                qw/first_row command/;
if ($command eq 'previous_page') {
  $first_row -= $rows_per_page;
  $first_row = 0 if $first_row < 0;
} elsif ($command eq 'next_page') {
  $first_row += $rows_per_page;
}

my $result = Database->get_results($query, $first_row);
Display->results($result, $first_row);

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good luck!

In reply to Re: Database Data Page by cleverett
in thread Database Data Page by artist

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