lukdk
Novice
Jul 8, 2010, 2:56 PM
Post #1 of 2
(6448 views)
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problem passing the $sth variable to another sub
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Hello there,
I've got a problem passing the $sth variable to another sub:
this is the sub that gives problems:
sub display_items {
my ($sth, $min, $max) = @_;
if (!$min){
$min=0;
}
if (!$max){
$max=50;
} else {
$min = $max;
$max = $max + 50;
}
my $counter = 0;
my $previous_url = sprintf("%s?choice=previous&min=%i&max=%i&sth=%s", url(), $min, $max,$sth);
my $next_url = sprintf("%s?choice=next&min=%i&max=%i&sth=%s", url(), $min, $max,$sth);
print "this procedure is called $min $max $sth";
while (my $row = $sth->fetchrow_hashref()){
if ($min <= $counter && $counter <= $max) {
display_entry ($row);
}
$counter++;
}
if ($counter == 0){
print p("no items were found in the database"), br();
}
print br (), a({-href => $previous_url}, "previous")," ", a({-href => $next_url}, "next"), br();
}
When i call this sub with the following code it works just fine:
sub submit_param {
my ($dbh ,$search, $operator, $searchvalue) = @_;
my $sth;
$sth = $dbh->prepare ("SELECT * FROM squid WHERE $search = ? ORDER BY id");
$sth->execute($searchvalue);
display_items($sth);
}
but when i call it from the internetl link that i'm printing in the display_items sub, I get an error.
This is the code that gets called when clicking on the link:
}elsif ($choice eq "next"){
display_items(param("sth"), param("min"), param("max"));
}
this gets printed on the website:
this procedure is called 50 100 DBI::st=HASH(0x85da454)
this is the error i see in the apache log file:
[Fri Jul 09 01:50:45 2010] [error] [client 192.168.0.52] main::update_url() called too early to check prototype at /var/www/localhost/cgi-bin/test.pl line 32., referer: http://192.168.0.52/cgi-bin/test.pl?choice=update
[Fri Jul 09 01:50:45 2010] [error] [client 192.168.0.52] Can't locate object method "fetchrow_hashref" via package "DBI::st=HASH(0x85da454)" (perhaps you forgot to load "DBI::st=HASH(0x85da454)"?) at /var/www/localhost/cgi-bin/test.pl line 118., referer: http://192.168.0.52/cgi-bin/test.pl?choice=update
and this is the error i get when i call ./test.pl choice=next
Use of uninitialized value in sprintf at ./test.pl line 115.
Use of uninitialized value in sprintf at ./test.pl line 116.
Use of uninitialized value in concatenation (.) or string at ./test.pl line 117.
Can't call method "fetchrow_hashref" on an undefined value at ./test.pl line 118.
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